diff --git a/dist/script/index.js b/dist/script/index.js
index 1f4043c..eb6e440 100644
--- a/dist/script/index.js
+++ b/dist/script/index.js
@@ -420,6 +420,9 @@ class StepRenderer extends AbstractRenderer {
                 .inputOptions([
                 '-f concat', // concat frames from the frame list
                 '-safe 0' // to prevent errors related to unsafe filenames
+            ])
+                .outputOptions([
+                `-vf fps=fps=${this.args.fps}`, // Framerate
             ])
                 .on('progress', (progress) => {
                 statsPrinter.print(progress);
@@ -509,10 +512,37 @@ class RealTimeRecorder extends AbstractRecorder {
     }
 }
 
+class FPSTicker {
+    interval;
+    lastTime = 0;
+    onTick = () => { };
+    timeoutId = null;
+    constructor(fps) {
+        this.interval = 1000 / fps;
+    }
+    start(onTick = () => { }) {
+        this.onTick = onTick;
+        this.lastTime = Date.now();
+        this.tick();
+    }
+    stop() {
+        clearTimeout(this.timeoutId);
+    }
+    tick() {
+        const now = Date.now();
+        const deltaTime = now - this.lastTime;
+        if (deltaTime >= this.interval) {
+            this.lastTime = now - (deltaTime % this.interval); // Adjust for drift
+            this.onTick(deltaTime);
+        }
+        this.timeoutId = setTimeout(() => this.tick(), this.interval - (Date.now() - this.lastTime));
+    }
+}
+
 class RealTimeRenderer extends AbstractRenderer {
     inputStream = null;
-    intervalId = null;
     lastFrame;
+    ticker;
     constructor(args) {
         super(args);
         const empty = new pngjs.PNG({
@@ -521,6 +551,7 @@ class RealTimeRenderer extends AbstractRenderer {
             colorType: 6,
         });
         this.lastFrame = pngjs.PNG.sync.write(empty);
+        this.ticker = new FPSTicker(args.fps);
     }
     startEncoding() {
         this.inputStream = new stream.PassThrough();
@@ -532,6 +563,9 @@ class RealTimeRenderer extends AbstractRenderer {
             '-pix_fmt yuva444p10le', // Lossless setting
             `-s ${this.args.videoWidth}x${this.args.videoHeight}`, // Frame size
             `-r ${this.args.fps}`, // Framerate
+        ])
+            .outputOptions([
+            `-vf fps=fps=${this.args.fps}`, // Framerate
         ])
             .on('start', () => {
             console.log('FFmpeg process started.');
@@ -547,16 +581,15 @@ class RealTimeRenderer extends AbstractRenderer {
         });
         command.run();
         // Produce frames in required rate
-        const intervalDuration = Math.round(1000 / 30);
-        this.intervalId = setInterval(() => {
+        this.ticker.start(() => {
             this.inputStream.write(this.lastFrame);
-        }, intervalDuration);
+        });
     }
     addFrame(frame) {
         this.lastFrame = frame;
     }
     endEncoding() {
-        clearTimeout(this.intervalId);
+        this.ticker.stop();
         this.inputStream.end();
     }
 }
@@ -593,8 +626,6 @@ class StepRecorder extends AbstractRecorder {
                 }
                 this.progressBar.increment();
             }
-            // Finish with en empty frame
-            this.renderer.addEmptyFrame();
             this.progressBar.stop();
             await this.renderer.endEncoding();
         }
diff --git a/dist/script/index.js.map b/dist/script/index.js.map
index 23ef668..5328d81 100644
--- a/dist/script/index.js.map
+++ b/dist/script/index.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.js","sources":["../../node_modules/@commander-js/extra-typings/index.js","../../node_modules/@commander-js/extra-typings/esm.mjs","../../src/script/assets.ts","../../src/script/cli.ts","../../src/script/work-dir.ts","../../src/script/stats-printer.ts","../../src/script/abstract-renderer.ts","../../src/script/step-renderer.ts","../../src/script/abstract-recorder.ts","../../src/script/real-time-recorder.ts","../../src/script/real-time-renderer.ts","../../src/script/step-recorder.ts","../../src/common/timecodes.ts","../../src/common/captions.ts","../../src/common/web-server.ts","../../src/script/index.ts"],"sourcesContent":["const commander = require('commander');\n\nexports = module.exports = {};\n\n// Return a different global program than commander,\n// and don't also return it as default export.\nexports.program = new commander.Command();\n\n/**\n * Expose classes. The FooT versions are just types, so return Commander original implementations!\n */\n\nexports.Argument = commander.Argument;\nexports.Command = commander.Command;\nexports.CommanderError = commander.CommanderError;\nexports.Help = commander.Help;\nexports.InvalidArgumentError = commander.InvalidArgumentError;\nexports.InvalidOptionArgumentError = commander.InvalidArgumentError; // Deprecated\nexports.Option = commander.Option;\n\n// In Commander, the create routines end up being aliases for the matching\n// methods on the global program due to the (deprecated) legacy default export.\n// Here we roll our own, the way Commander might in future.\nexports.createCommand = (name) => new commander.Command(name);\nexports.createOption = (flags, description) =>\n  new commander.Option(flags, description);\nexports.createArgument = (name, description) =>\n  new commander.Argument(name, description);\n","import extraTypingsCommander from './index.js';\n\n// wrapper to provide named exports for ESM.\nexport const {\n  program,\n  createCommand,\n  createArgument,\n  createOption,\n  CommanderError,\n  InvalidArgumentError,\n  InvalidOptionArgumentError, // deprecated old name\n  Command,\n  Argument,\n  Option,\n  Help,\n} = extraTypingsCommander;\n","import * as path from 'path';\n\nexport const assetsFolder = path.join(__dirname, '..', '..', 'assets');\nexport const defaultStylesCss = path.join(assetsFolder, 'captions.css');\nexport const indexHtml = path.join(assetsFolder, 'index.html');\n\nexport const indexJs = path.join(__dirname, '..', 'player', 'index.js');\n\nexport const nodeModules = path.join(__dirname, '..', '..', 'node_modules');\n","import {Command} from '@commander-js/extra-typings';\nimport packageJson from '../../package.json';\nimport {defaultStylesCss} from './assets';\nimport * as cliProgress from 'cli-progress';\nimport * as path from 'path';\n\nexport interface Args {\n    srtInputFile: string;\n    movOutputFile: string;\n    videoWidth: number;\n    videoHeight: number;\n    fps: number;\n    styleFile: string;\n    css3Animations: boolean;\n    isPreview: boolean;\n}\n\nfunction parseIntAndAssert(...assertions: ((v: number) => void)[]): (v: string) => number {\n    return (value: string) => {\n        const int = parseInt(value, 10);\n        assertions.forEach(assertion => assertion(int));\n        return int;\n    }\n}\n\nfunction assertPositive(option: string): (v: number) => void {\n    return (value: number) => {\n        if (value < 0) {\n            throw new Error(`${option} should be positive!`);\n        }\n    };\n}\n\nfunction assertMinMax(option: string, min: number, max: number): (v: number) => void {\n    return (value: number) => {\n        if (value < min || value > max) {\n            throw new Error(`${option} should be between ${min} and ${max}!`);\n        }\n    };\n}\n\nfunction assertFileExtension(ext: string): (v: string) => void {\n    return (value: string) => {\n        if (!value.endsWith(ext)) {\n            throw new Error(`File should have extension ${ext}!`);\n        }\n        return value;\n    };\n}\n\nconst program = new Command();\n\nprogram\n    .name('pupcaps')\n    .description('Tool to add stylish captions to your video.')\n    .version(packageJson.version)\n    .argument('<file>', 'Path to the input SubRip Subtitle (.srt) file.', assertFileExtension('.srt'))\n    .option('-o, --output <file>',\n        'Full or relative path where the created Films Apple QuickTime (MOV) file should be written. ' +\n        'By default, it will be saved in the same directory as the input subtitle file.',\n        assertFileExtension('.mov'))\n    .option('-w, --width <number>',\n        'Width of the video in pixels.',\n        parseIntAndAssert(assertPositive('Width')),\n        1080)\n    .option('-h, --height <number>',\n        'Height of the video in pixels.',\n        parseIntAndAssert(assertPositive('Height')),\n        1920)\n    .option('-r, --fps <number>',\n        'Specifies the frame rate (FPS) of the output video. Valid values are between 1 and 60.',\n        parseIntAndAssert(assertMinMax('FPS', 1, 60)),\n        30)\n    .option('-s, --style <file>',\n        'Full or relative path to the styles .css file. ' +\n        'If not provided, default styles for captions will be used.',\n        assertFileExtension('.css'))\n    .option('-a, --animate',\n        'Records captions with CSS3 animations. ' +\n        'Note: The recording will run for the entire duration of the video. ' +\n        'Use this option only if your captions involve CSS3 animations.')\n    .option('--preview',\n        'Prevents the script from generating a video file. ' +\n        'Instead, captions are displayed in the browser for debugging and preview purposes.')\n    .action((inputFile, options: any) => {\n        if (!options.output) {\n            const fileBasename = (inputFile as any as string).slice(0, -4);\n            options.output = `${fileBasename}.mov`;\n        }\n\n        if (!options.style) {\n            options.style = defaultStylesCss;\n        } else {\n            options.style = path.resolve(options.style);\n        }\n    });\n\nexport function parseArgs(): Args {\n    program.parse();\n    const opts = program.opts() as any;\n\n    return {\n        srtInputFile: program.args[0],\n        movOutputFile: opts.output,\n        videoWidth: opts.width,\n        videoHeight: opts.height,\n        fps: opts.fps,\n        styleFile: opts.style,\n        css3Animations: opts.animate,\n        isPreview: opts.preview,\n    };\n}\n\nexport function printArgs(args: Args) {\n    const styles = args.styleFile === defaultStylesCss\n        ? '(Default)'\n        : args.styleFile;\n\n    const srt = `\n    Output:     ${args.movOutputFile}\n    Width:      ${args.videoWidth} px\n    Height:     ${args.videoHeight} px\n    FPS:        ${args.fps}\n    Styles:     ${styles}\n    Animations: ${ args.css3Animations ? 'yes' : 'no' }\n    `;\n\n    console.log(srt);\n}\n\nexport function createProgressBar(): cliProgress.SingleBar {\n    return new cliProgress.SingleBar({\n        format: 'Progress |{bar}| {percentage}% || {value}/{total} Captions',\n        barCompleteChar: '\\u2588',\n        barIncompleteChar: '\\u2591',\n        hideCursor: true,\n    }, cliProgress.Presets.shades_classic);\n}","import * as tmp from 'tmp';\nimport * as path from 'path';\nimport {writeFileSync, symlinkSync, rmSync, mkdirSync} from 'fs';\nimport {Caption} from '../common/captions';\nimport {Args} from './cli';\nimport {indexHtml, indexJs, nodeModules} from './assets';\nimport {PlayerArgs} from '../common/player-args';\n\nexport class WorkDir {\n    private readonly workDir = tmp.dirSync({ template: 'pupcaps-XXXXXX' });\n\n    constructor(private readonly captions: Caption[],\n                private readonly args: Args) {\n    }\n\n    public setup(): string {\n        const index = path.join(this.workDir.name, 'index.html');\n\n        symlinkSync(indexHtml, index);\n        symlinkSync(indexJs, path.join(this.workDir.name, 'index.js'));\n        symlinkSync(this.args.styleFile, path.join(this.workDir.name, 'captions.css'));\n        symlinkSync(nodeModules, path.join(this.workDir.name, 'node_modules'));\n\n        this.setupCaptions();\n        this.setupPlayerArgs();\n        this.setupVideoSizeCss();\n\n        mkdirSync(this.screenShotsDir);\n\n        return index;\n    }\n\n    public clear() {\n        rmSync(this.workDir.name, { recursive: true, force: true });\n    }\n\n    public get screenShotsDir(): string {\n        return path.join(this.workDir.name, 'screenshots');\n    }\n\n    public get rootDir(): string {\n        return this.workDir.name;\n    }\n\n    private setupVideoSizeCss() {\n        const css= `#video {\n            width: ${this.args.videoWidth}px;\n            height: ${this.args.videoHeight}px;\n        }`;\n        const videoSizeFile = path.join(this.workDir.name, 'video.size.css');\n\n        writeFileSync(videoSizeFile, css);\n    }\n\n    private setupCaptions() {\n        const captionsJs = 'window.captions = ' + JSON.stringify(this.captions, null, 2);\n        const captionsJsFile = path.join(this.workDir.name, 'captions.js');\n\n        writeFileSync(captionsJsFile, captionsJs);\n    }\n\n    private setupPlayerArgs() {\n        const playerArgs: PlayerArgs = {\n            isPreview: this.args.isPreview,\n        };\n        const argsJs = 'window.playerArgs = ' + JSON.stringify(playerArgs, null, 2);\n        const argsJsFile = path.join(this.workDir.name, 'player.args.js');\n\n        writeFileSync(argsJsFile, argsJs);\n    }\n}","export class StatsPrinter {\n    private statsPrinted = false;\n\n    public print(stats: Object) {\n        const lines = Object\n            .entries(stats)\n            .map(([key, value]) => `${key}: ${value}`);\n\n        if (this.statsPrinted) {\n            process.stdout.write(`\\x1b[${lines.length}A`);  // Move up N lines\n        }\n\n        lines.forEach((line) => {\n            process.stdout.write(`\\r${line.padEnd(40)}\\n`); // Ensure the line is fully overwritten\n        });\n\n        this.statsPrinted = true;\n    }\n}","import ffmpeg, { setFfmpegPath } from 'fluent-ffmpeg';\nimport {Args} from './cli';\n\n(() => {\n    try {\n        const ffmpegInstaller = require('@ffmpeg-installer/ffmpeg');\n        setFfmpegPath(ffmpegInstaller!.path);\n    } catch (error) {\n        console.warn('Impossible to install FFMpeg. Use system-provided ffmpeg.');\n    }\n})();\n\nexport abstract class AbstractRenderer {\n    protected constructor(protected readonly args : Args) {\n    }\n\n    public abstract startEncoding(): void;\n    public abstract endEncoding(): void;\n\n    protected baseFfmpegCommand(): ffmpeg.FfmpegCommand {\n        return ffmpeg()\n            .outputOptions([\n                '-c:v prores_ks',           // codec for Films Apple QuickTime (MOV)\n                '-profile:v 4444',          // enable the best quality\n                '-pix_fmt yuva444p10le',    // lossless setting\n                '-q:v 0',                   // lossless setting\n                '-vendor ap10'              // ensures the output MOV file is compatible with Apple QuickTime\n            ])\n            .output(this.args.movOutputFile);\n    }\n}","import {Args} from './cli';\nimport {PNG, PNGWithMetadata} from 'pngjs';\nimport * as path from 'path';\nimport {appendFileSync, writeFileSync} from 'fs';\nimport {WorkDir} from './work-dir';\nimport {Caption} from '../common/captions';\nimport {StatsPrinter} from './stats-printer';\nimport {AbstractRenderer} from './abstract-renderer';\n\nexport class StepRenderer extends AbstractRenderer {\n    private readonly framesFileName: string;\n    private readonly emptyFrameFileName: string;\n\n    constructor(args : Args,\n                private readonly workDir: WorkDir) {\n        super(args);\n        this.framesFileName = path.join(workDir.screenShotsDir, 'frames.txt');\n        this.emptyFrameFileName = path.join(workDir.screenShotsDir, 'empty.png');\n    }\n\n    public startEncoding() {\n        const empty = new PNG({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n            colorType: 6,\n        });\n        writeFileSync(this.emptyFrameFileName, PNG.sync.write(empty));\n    }\n\n    public addEmptyFrame(durationMs?: number) {\n        let frameDef = `file '${this.emptyFrameFileName}'\\n`;\n\n        if (durationMs) {\n            const durationSec = durationMs / 1000;\n            frameDef += `duration ${durationSec}\\n`;\n        }\n\n        appendFileSync(this.framesFileName, frameDef, 'utf8');\n    }\n\n    public addFrame(caption: Caption, png: PNGWithMetadata) {\n        const screenShotFileName = path.join(this.workDir.screenShotsDir, `screenshot_${caption.index}.png`);\n        writeFileSync(screenShotFileName, PNG.sync.write(png));\n\n        const durationSec = (caption.endTimeMs - caption.startTimeMs) / 1000;\n\n        appendFileSync(\n            this.framesFileName,\n            `file '${screenShotFileName}'\\nduration ${durationSec}\\n`,\n            'utf8');\n    }\n\n    public async endEncoding() {\n        console.log(`Encoding ${this.args.movOutputFile}...\\n`);\n        const statsPrinter = new StatsPrinter();\n\n        await new Promise((resolve, reject) => {\n            this.baseFfmpegCommand()\n                .input(this.framesFileName)\n                .inputOptions([\n                    '-f concat',    // concat frames from the frame list\n                    '-safe 0'       // to prevent errors related to unsafe filenames\n                ])\n                .on('progress', (progress: Object) => {\n                    statsPrinter.print(progress);\n                })\n                .on('end', () => {\n                    console.log(`${this.args.movOutputFile} encoded`);\n                    resolve(this.args.movOutputFile);\n                })\n                .on('error', (err: any) => {\n                    reject(err);\n                })\n                .run();\n        });\n    }\n}","import * as puppeteer from 'puppeteer';\nimport {Args} from './cli';\n\nexport abstract class AbstractRecorder {\n    protected browser: puppeteer.Browser | null = null;\n    protected page: puppeteer.Page | null = null;\n\n    protected constructor(protected readonly args: Args) {\n    }\n\n    public abstract recordCaptionsVideo(indexHtml: string): Promise<void>;\n\n    protected async launchBrowser(indexHtml: string): Promise<puppeteer.ElementHandle | null> {\n        this.browser = await puppeteer.launch({\n            args: [\n                '--disable-web-security',           // Disable CORS\n                '--allow-file-access-from-files',   // Allow file access\n            ],\n            headless: true,\n        });\n        this.page = await this.browser.newPage();\n        await this.page.goto(`file://${indexHtml}`);\n        await this.page.setViewport({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n        });\n        await this.page.evaluate(() => {\n            return window.ready;\n        });\n\n        return this.page.$('#video');\n    }\n}","import * as puppeteer from 'puppeteer';\nimport {RealTimeRenderer} from './real-time-renderer';\nimport {Args} from './cli';\nimport {AbstractRecorder} from './abstract-recorder';\n\nexport class RealTimeRecorder extends AbstractRecorder {\n    constructor(args: Args,\n                private readonly videoRenderer: RealTimeRenderer) {\n        super(args);\n    }\n\n    public async recordCaptionsVideo(indexHtml: string) {\n        try {\n            await this.launchBrowser(indexHtml);\n            const cdpSession = await this.page!.createCDPSession();\n\n            await cdpSession.send(\n                'Emulation.setDefaultBackgroundColorOverride',\n                { color: { r: 0, g: 0, b: 0, a: 0 } }\n            );\n            await cdpSession.send('Animation.setPlaybackRate', {\n                playbackRate: 1,\n            });\n\n            cdpSession.on('Page.screencastFrame',\n                (frame) => this.handleScreenCastFrame(cdpSession, frame));\n\n            this.videoRenderer.startEncoding();\n\n            await cdpSession.send('Page.startScreencast', {\n                everyNthFrame: 1,\n                format: 'png',\n                quality: 100,\n            });\n\n            await this.page!.evaluate(() => {\n                return new Promise<void>((resolve) => {\n                    window.Player.onStop = resolve;\n                    window.Player.play();\n                })\n            });\n\n            await cdpSession.send('Page.stopScreencast');\n\n            this.videoRenderer.endEncoding();\n        } catch (error) {\n            console.error('Error during Puppeteer operation:', error);\n        } finally {\n            await this.browser?.close();\n        }\n    }\n\n    private async handleScreenCastFrame(cdpSession: puppeteer.CDPSession,\n                                        frame: puppeteer.Protocol.Page.ScreencastFrameEvent) {\n        const { sessionId, data } = frame;\n        await cdpSession.send('Page.screencastFrameAck', { sessionId });\n        const frameBuffer = Buffer.from(data, 'base64');\n        this.videoRenderer.addFrame(frameBuffer);\n    }\n}","import {PassThrough} from 'stream';\nimport {PNG} from 'pngjs';\nimport {Args} from './cli';\nimport {StatsPrinter} from './stats-printer';\nimport {AbstractRenderer} from './abstract-renderer';\n\nexport class RealTimeRenderer extends AbstractRenderer {\n    private inputStream: PassThrough | null = null;\n    private intervalId: NodeJS.Timeout | null = null;\n    private lastFrame: Buffer;\n\n    constructor(args: Args) {\n        super(args);\n        const empty = new PNG({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n            colorType: 6,\n        });\n        this.lastFrame = PNG.sync.write(empty);\n    }\n\n    public startEncoding() {\n        this.inputStream = new PassThrough();\n        const statsPrinter = new StatsPrinter();\n\n        const command = this.baseFfmpegCommand()\n            .input(this.inputStream)\n            .inputOptions([\n                '-f image2pipe',                                        // Format of input frames\n                '-pix_fmt yuva444p10le',                                // Lossless setting\n                `-s ${this.args.videoWidth}x${this.args.videoHeight}`,  // Frame size\n                `-r ${this.args.fps}`,                                  // Framerate\n            ])\n            .on('start', () => {\n                console.log('FFmpeg process started.');\n            })\n            .on('progress', (progress) => {\n                statsPrinter.print(progress);\n            })\n            .on('end', () => {\n                console.log('FFmpeg process completed.');\n            })\n            .on('error', (err) => {\n                console.error('An error occurred:', err.message);\n            });\n\n        command.run();\n\n        // Produce frames in required rate\n        const intervalDuration = Math.round(1000 / 30);\n        this.intervalId = setInterval(() => {\n            this.inputStream!.write(this.lastFrame);\n        }, intervalDuration);\n    }\n\n    public addFrame(frame: Buffer) {\n        this.lastFrame = frame;\n    }\n\n    public endEncoding() {\n        clearTimeout(this.intervalId!);\n        this.inputStream!.end();\n    }\n}","import * as puppeteer from 'puppeteer';\nimport * as cliProgress from 'cli-progress';\nimport {PNG, PNGWithMetadata} from 'pngjs';\nimport {Caption} from '../common/captions';\nimport {StepRenderer} from './step-renderer';\nimport {Args} from './cli';\nimport {AbstractRecorder} from './abstract-recorder';\n\nexport class StepRecorder extends AbstractRecorder {\n    constructor(args: Args,\n                private readonly captions: Caption[],\n                private readonly renderer: StepRenderer,\n                private readonly progressBar: cliProgress.SingleBar) {\n        super(args);\n    }\n\n    public async recordCaptionsVideo(indexHtml: string) {\n        this.progressBar.start(this.captions.length, 0);\n\n        try {\n            const videoElem = await this.launchBrowser(indexHtml);\n\n            this.renderer.startEncoding();\n\n            // Add empty frame before captions starts\n            const beginningTime = this.captions[0].startTimeMs;\n            this.renderer.addEmptyFrame(beginningTime);\n\n            for (let i = 0; i < this.captions.length; i++) {\n                const caption = this.captions[i];\n\n                await this.nextStep();\n\n                const screenShot = await this.takeScreenShot(videoElem!);\n                this.renderer.addFrame(caption, screenShot);\n\n                // Add delay before the next frame\n                if (i < this.captions.length - 1) {\n                    const idleDelay = this.captions[i + 1].startTimeMs - caption.endTimeMs;\n                    if (idleDelay) {\n                        this.renderer.addEmptyFrame(idleDelay);\n                    }\n                }\n\n                this.progressBar.increment();\n            }\n\n            // Finish with en empty frame\n            this.renderer.addEmptyFrame();\n\n            this.progressBar.stop();\n            await this.renderer.endEncoding();\n        } catch (error) {\n            console.error('Error during Puppeteer operation:', error);\n        } finally {\n            await this.browser?.close();\n        }\n    }\n\n    private async nextStep() {\n        await this.page!.evaluate(() => {\n            window.Player.next();\n        });\n    }\n\n    private async takeScreenShot(elem: puppeteer.ElementHandle): Promise<PNGWithMetadata> {\n        const screenshotBuffer = await elem.screenshot({\n            encoding: 'binary',\n            omitBackground: true,\n        });\n        return PNG.sync.read(Buffer.from(screenshotBuffer));\n    }\n}","export class Timecode {\n    public readonly hours: number;\n    public readonly minutes: number;\n    public readonly seconds: number;\n    public readonly millis: number;\n\n    constructor(millis: number) {\n        this.millis = millis % 1000;\n\n        this.hours = Math.floor(millis / 3_600_000);\n        const remainingMillisAfterHours = millis % 3_600_000;\n        this.minutes = Math.floor(remainingMillisAfterHours / 60_000);\n        const remainingMillisAfterMinutes = remainingMillisAfterHours % 60_000;\n        this.seconds = Math.floor(remainingMillisAfterMinutes / 1000);\n    }\n\n    public get hh(): string {\n        return String(this.hours).padStart(2, '0');\n    }\n\n    public get mm(): string {\n        return String(this.minutes).padStart(2, '0');\n    }\n\n    public get ss(): string {\n        return String(this.seconds).padStart(2, '0');\n    }\n    public get SSS(): string {\n        return String(this.millis).padStart(3, '0');\n    }\n\n    public get asString(): string {\n        return `${this.hh}:${this.mm}:${this.ss},${this.SSS}`;\n    }\n}\n\nexport function toMillis(timecodes: string): number {\n    const parts = timecodes.split(/[:,]/).map(Number);\n\n    const hours = parts[0];\n    const minutes = parts[1];\n    const seconds = parts[2];\n    const milliseconds = parts[3];\n\n    return hours * 3_600_000    // hours to millis\n        + minutes * 60_000      // minutes to millis\n        + seconds * 1000        // second to millis\n        + milliseconds;\n}","import {toMillis} from './timecodes';\n\nconst indexLinePattern = /^\\d+$/;\nconst timecodesLinePattern = /^(\\d{2}:\\d{2}:\\d{2},\\d{3}) --> (\\d{2}:\\d{2}:\\d{2},\\d{3})$/;\nconst highlightedWordPattern = /^\\[(.+)](?:\\((\\w+)\\))?$/;\n\nexport interface Word {\n    rawWord: string;\n    isHighlighted: boolean;\n    isBeforeHighlighted: boolean;\n    isAfterHighlighted: boolean;\n    highlightClass?: string;\n}\n\nexport interface Caption {\n    index: number;\n    startTimeMs: number;\n    endTimeMs: number;\n    words: Word[];\n}\n\nexport function haveSameWords(caption1: Caption, caption2: Caption): boolean {\n    if (caption1.words.length != caption2.words.length) {\n        return false;\n    }\n\n    for (let i =0; i < caption1.words.length; i++) {\n        if (caption1.words[i].rawWord != caption2.words[i].rawWord) {\n            return false;\n        }\n    }\n\n    return true;\n}\n\nexport function readCaptions(srtContent: string): Caption[] {\n    const lines = srtContent.split('\\n');\n    const captions: Caption[] = [];\n\n    let index: number = 0;\n    let timecodesStart: string | null = null;\n    let timecodesEnd: string | null = null;\n\n    for (const line of lines) {\n        let match;\n        if ((match = line.match(indexLinePattern))) {\n            index = Number(line);\n        } else if ((match = line.match(timecodesLinePattern))) {\n            timecodesStart = match[1];\n            timecodesEnd = match[2];\n        } else if (line.length) {\n            const start = toMillis(timecodesStart!);\n            const end = toMillis(timecodesEnd!);\n\n            const words = readWords(line);\n\n            captions.push({\n                index,\n                words,\n                startTimeMs: start,\n                endTimeMs: end,\n            });\n        }\n    }\n\n    return captions;\n}\n\nexport function readWords(text: string): Word[] {\n    const words = splitText(text);\n    const highlightedIndex = words.findIndex(word => word.match(highlightedWordPattern));\n\n    const res: Word[] = [];\n\n    for (let i = 0; i < words.length; i++) {\n        const word = words[i];\n        const match = word.match(highlightedWordPattern);\n        const rawWord = match ? match[1] : word;\n        const highlightClass = match && match[2] ? match[2] : null;\n\n        const isHighlighted = Boolean(match);\n        const isBeforeHighlighted = Boolean(~highlightedIndex && !isHighlighted && i < highlightedIndex);\n        const isAfterHighlighted = Boolean(~highlightedIndex && !isHighlighted && i > highlightedIndex);\n\n        const wordObject: Word = {\n            rawWord,\n            isHighlighted,\n            isBeforeHighlighted,\n            isAfterHighlighted,\n        };\n\n        if (highlightClass) {\n            wordObject.highlightClass = highlightClass;\n        }\n\n        res.push(wordObject);\n    }\n\n    return res;\n}\n\nexport function splitText(text: string): string[] {\n    const words: string[] = [];\n\n    let currentWord = '';\n    let isCurrentHighlighted = false;\n\n    for (let i = 0; i < text.length; i++) {\n        const char = text[i];\n        const isWhitespace = /^\\s$/.test(char);\n        const isPunctuation = /[,.!?]/.test(char);\n\n        if (!isWhitespace) {\n            if (!isPunctuation) {\n                currentWord += char;\n                switch (char) {\n                    case '[':\n                    case '(':\n                        isCurrentHighlighted = true;\n                        break;\n                    case ']':\n                    case ')':\n                        isCurrentHighlighted = false;\n                        break;\n                }\n            } else {\n                if (currentWord) {\n   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           server.listen(port, async () => {\n                    try {\n                        const childProcess = await WebServer.openUrl(`http://127.0.0.1:${port}${relativePath}`);\n\n                        childProcess.on('close', () => {\n                            server.close(() => {\n                                resolve();\n                            });\n                        });\n                    } catch (error) {\n                        reject(error);\n                    }\n                });\n            } catch (error) {\n                reject(error);\n            }\n        });\n    }\n\n    private static async getFreePort(): Promise<number> {\n        const { default: getPort } = await import('get-port');\n        return getPort();\n    }\n\n    private static async openUrl(url: string) {\n        const { default: open } = await import('open');\n        return open(url, { wait: true });\n    }\n}","import {readFileSync} from 'fs';\nimport {Args, createProgressBar, parseArgs, printArgs} from './cli';\nimport {WorkDir} from './work-dir';\nimport {StepRenderer} from './step-renderer';\nimport {RealTimeRecorder} from './real-time-recorder';\nimport {RealTimeRenderer} from './real-time-renderer';\nimport {StepRecorder} from './step-recorder';\nimport {AbstractRecorder} from './abstract-recorder';\nimport {Caption, readCaptions} from '../common/captions';\nimport {WebServer} from '../common/web-server';\n\nfunction parseCaptions(srtCaptionsFile: string): Caption[] {\n    const captionsSrc = readFileSync(srtCaptionsFile, 'utf-8');\n    return readCaptions(captionsSrc);\n}\n\nfunction createRecorder(args: Args, captions: Caption[], workDir: WorkDir): AbstractRecorder {\n    if (args.css3Animations) {\n        const realTimeRenderer = new RealTimeRenderer(args);\n        return new RealTimeRecorder(args, realTimeRenderer);\n    } else {\n        const progressBar = createProgressBar();\n        const stepRenderer = new 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\ No newline at end of file
+{"version":3,"file":"index.js","sources":["../../node_modules/@commander-js/extra-typings/index.js","../../node_modules/@commander-js/extra-typings/esm.mjs","../../src/script/assets.ts","../../src/script/cli.ts","../../src/script/work-dir.ts","../../src/script/stats-printer.ts","../../src/script/abstract-renderer.ts","../../src/script/step-renderer.ts","../../src/script/abstract-recorder.ts","../../src/script/real-time-recorder.ts","../../src/script/fps-ticker.ts","../../src/script/real-time-renderer.ts","../../src/script/step-recorder.ts","../../src/common/timecodes.ts","../../src/common/captions.ts","../../src/common/web-server.ts","../../src/script/index.ts"],"sourcesContent":["const commander = require('commander');\n\nexports = module.exports = {};\n\n// Return a different global program than commander,\n// and don't also return it as default export.\nexports.program = new commander.Command();\n\n/**\n * Expose classes. The FooT versions are just types, so return Commander original implementations!\n */\n\nexports.Argument = commander.Argument;\nexports.Command = commander.Command;\nexports.CommanderError = commander.CommanderError;\nexports.Help = commander.Help;\nexports.InvalidArgumentError = commander.InvalidArgumentError;\nexports.InvalidOptionArgumentError = commander.InvalidArgumentError; // Deprecated\nexports.Option = commander.Option;\n\n// In Commander, the create routines end up being aliases for the matching\n// methods on the global program due to the (deprecated) legacy default export.\n// Here we roll our own, the way Commander might in future.\nexports.createCommand = (name) => new commander.Command(name);\nexports.createOption = (flags, description) =>\n  new commander.Option(flags, description);\nexports.createArgument = (name, description) =>\n  new commander.Argument(name, description);\n","import extraTypingsCommander from './index.js';\n\n// wrapper to provide named exports for ESM.\nexport const {\n  program,\n  createCommand,\n  createArgument,\n  createOption,\n  CommanderError,\n  InvalidArgumentError,\n  InvalidOptionArgumentError, // deprecated old name\n  Command,\n  Argument,\n  Option,\n  Help,\n} = extraTypingsCommander;\n","import * as path from 'path';\n\nexport const assetsFolder = path.join(__dirname, '..', '..', 'assets');\nexport const defaultStylesCss = path.join(assetsFolder, 'captions.css');\nexport const indexHtml = path.join(assetsFolder, 'index.html');\n\nexport const indexJs = path.join(__dirname, '..', 'player', 'index.js');\n\nexport const nodeModules = path.join(__dirname, '..', '..', 'node_modules');\n","import {Command} from '@commander-js/extra-typings';\nimport packageJson from '../../package.json';\nimport {defaultStylesCss} from './assets';\nimport * as cliProgress from 'cli-progress';\nimport * as path from 'path';\n\nexport interface Args {\n    srtInputFile: string;\n    movOutputFile: string;\n    videoWidth: number;\n    videoHeight: number;\n    fps: number;\n    styleFile: string;\n    css3Animations: boolean;\n    isPreview: boolean;\n}\n\nfunction parseIntAndAssert(...assertions: ((v: number) => void)[]): (v: string) => number {\n    return (value: string) => {\n        const int = parseInt(value, 10);\n        assertions.forEach(assertion => assertion(int));\n        return int;\n    }\n}\n\nfunction assertPositive(option: string): (v: number) => void {\n    return (value: number) => {\n        if (value < 0) {\n            throw new Error(`${option} should be positive!`);\n        }\n    };\n}\n\nfunction assertMinMax(option: string, min: number, max: number): (v: number) => void {\n    return (value: number) => {\n        if (value < min || value > max) {\n            throw new Error(`${option} should be between ${min} and ${max}!`);\n        }\n    };\n}\n\nfunction assertFileExtension(ext: string): (v: string) => void {\n    return (value: string) => {\n        if (!value.endsWith(ext)) {\n            throw new Error(`File should have extension ${ext}!`);\n        }\n        return value;\n    };\n}\n\nconst program = new Command();\n\nprogram\n    .name('pupcaps')\n    .description('Tool to add stylish captions to your video.')\n    .version(packageJson.version)\n    .argument('<file>', 'Path to the input SubRip Subtitle (.srt) file.', assertFileExtension('.srt'))\n    .option('-o, --output <file>',\n        'Full or relative path where the created Films Apple QuickTime (MOV) file should be written. ' +\n        'By default, it will be saved in the same directory as the input subtitle file.',\n        assertFileExtension('.mov'))\n    .option('-w, --width <number>',\n        'Width of the video in pixels.',\n        parseIntAndAssert(assertPositive('Width')),\n        1080)\n    .option('-h, --height <number>',\n        'Height of the video in pixels.',\n        parseIntAndAssert(assertPositive('Height')),\n        1920)\n    .option('-r, --fps <number>',\n        'Specifies the frame rate (FPS) of the output video. Valid values are between 1 and 60.',\n        parseIntAndAssert(assertMinMax('FPS', 1, 60)),\n        30)\n    .option('-s, --style <file>',\n        'Full or relative path to the styles .css file. ' +\n        'If not provided, default styles for captions will be used.',\n        assertFileExtension('.css'))\n    .option('-a, --animate',\n        'Records captions with CSS3 animations. ' +\n        'Note: The recording will run for the entire duration of the video. ' +\n        'Use this option only if your captions involve CSS3 animations.')\n    .option('--preview',\n        'Prevents the script from generating a video file. ' +\n        'Instead, captions are displayed in the browser for debugging and preview purposes.')\n    .action((inputFile, options: any) => {\n        if (!options.output) {\n            const fileBasename = (inputFile as any as string).slice(0, -4);\n            options.output = `${fileBasename}.mov`;\n        }\n\n        if (!options.style) {\n            options.style = defaultStylesCss;\n        } else {\n            options.style = path.resolve(options.style);\n        }\n    });\n\nexport function parseArgs(): Args {\n    program.parse();\n    const opts = program.opts() as any;\n\n    return {\n        srtInputFile: program.args[0],\n        movOutputFile: opts.output,\n        videoWidth: opts.width,\n        videoHeight: opts.height,\n        fps: opts.fps,\n        styleFile: opts.style,\n        css3Animations: opts.animate,\n        isPreview: opts.preview,\n    };\n}\n\nexport function printArgs(args: Args) {\n    const styles = args.styleFile === defaultStylesCss\n        ? '(Default)'\n        : args.styleFile;\n\n    const srt = `\n    Output:     ${args.movOutputFile}\n    Width:      ${args.videoWidth} px\n    Height:     ${args.videoHeight} px\n    FPS:        ${args.fps}\n    Styles:     ${styles}\n    Animations: ${ args.css3Animations ? 'yes' : 'no' }\n    `;\n\n    console.log(srt);\n}\n\nexport function createProgressBar(): cliProgress.SingleBar {\n    return new cliProgress.SingleBar({\n        format: 'Progress |{bar}| {percentage}% || {value}/{total} Captions',\n        barCompleteChar: '\\u2588',\n        barIncompleteChar: '\\u2591',\n        hideCursor: true,\n    }, cliProgress.Presets.shades_classic);\n}","import * as tmp from 'tmp';\nimport * as path from 'path';\nimport {writeFileSync, symlinkSync, rmSync, mkdirSync} from 'fs';\nimport {Caption} from '../common/captions';\nimport {Args} from './cli';\nimport {indexHtml, indexJs, nodeModules} from './assets';\nimport {PlayerArgs} from '../common/player-args';\n\nexport class WorkDir {\n    private readonly workDir = tmp.dirSync({ template: 'pupcaps-XXXXXX' });\n\n    constructor(private readonly captions: Caption[],\n                private readonly args: Args) {\n    }\n\n    public setup(): string {\n        const index = path.join(this.workDir.name, 'index.html');\n\n        symlinkSync(indexHtml, index);\n        symlinkSync(indexJs, path.join(this.workDir.name, 'index.js'));\n        symlinkSync(this.args.styleFile, path.join(this.workDir.name, 'captions.css'));\n        symlinkSync(nodeModules, path.join(this.workDir.name, 'node_modules'));\n\n        this.setupCaptions();\n        this.setupPlayerArgs();\n        this.setupVideoSizeCss();\n\n        mkdirSync(this.screenShotsDir);\n\n        return index;\n    }\n\n    public clear() {\n        rmSync(this.workDir.name, { recursive: true, force: true });\n    }\n\n    public get screenShotsDir(): string {\n        return path.join(this.workDir.name, 'screenshots');\n    }\n\n    public get rootDir(): string {\n        return this.workDir.name;\n    }\n\n    private setupVideoSizeCss() {\n        const css= `#video {\n            width: ${this.args.videoWidth}px;\n            height: ${this.args.videoHeight}px;\n        }`;\n        const videoSizeFile = path.join(this.workDir.name, 'video.size.css');\n\n        writeFileSync(videoSizeFile, css);\n    }\n\n    private setupCaptions() {\n        const captionsJs = 'window.captions = ' + JSON.stringify(this.captions, null, 2);\n        const captionsJsFile = path.join(this.workDir.name, 'captions.js');\n\n        writeFileSync(captionsJsFile, captionsJs);\n    }\n\n    private setupPlayerArgs() {\n        const playerArgs: PlayerArgs = {\n            isPreview: this.args.isPreview,\n        };\n        const argsJs = 'window.playerArgs = ' + JSON.stringify(playerArgs, null, 2);\n        const argsJsFile = path.join(this.workDir.name, 'player.args.js');\n\n        writeFileSync(argsJsFile, argsJs);\n    }\n}","export class StatsPrinter {\n    private statsPrinted = false;\n\n    public print(stats: Object) {\n        const lines = Object\n            .entries(stats)\n            .map(([key, value]) => `${key}: ${value}`);\n\n        if (this.statsPrinted) {\n            process.stdout.write(`\\x1b[${lines.length}A`);  // Move up N lines\n        }\n\n        lines.forEach((line) => {\n            process.stdout.write(`\\r${line.padEnd(40)}\\n`); // Ensure the line is fully overwritten\n        });\n\n        this.statsPrinted = true;\n    }\n}","import ffmpeg, { setFfmpegPath } from 'fluent-ffmpeg';\nimport {Args} from './cli';\n\n(() => {\n    try {\n        const ffmpegInstaller = require('@ffmpeg-installer/ffmpeg');\n        setFfmpegPath(ffmpegInstaller!.path);\n    } catch (error) {\n        console.warn('Impossible to install FFMpeg. Use system-provided ffmpeg.');\n    }\n})();\n\nexport abstract class AbstractRenderer {\n    protected constructor(protected readonly args : Args) {\n    }\n\n    public abstract startEncoding(): void;\n    public abstract endEncoding(): void;\n\n    protected baseFfmpegCommand(): ffmpeg.FfmpegCommand {\n        return ffmpeg()\n            .outputOptions([\n                '-c:v prores_ks',           // codec for Films Apple QuickTime (MOV)\n                '-profile:v 4444',          // enable the best quality\n                '-pix_fmt yuva444p10le',    // lossless setting\n                '-q:v 0',                   // lossless setting\n                '-vendor ap10'              // ensures the output MOV file is compatible with Apple QuickTime\n            ])\n            .output(this.args.movOutputFile);\n    }\n}","import {Args} from './cli';\nimport {PNG, PNGWithMetadata} from 'pngjs';\nimport * as path from 'path';\nimport {appendFileSync, writeFileSync} from 'fs';\nimport {WorkDir} from './work-dir';\nimport {Caption} from '../common/captions';\nimport {StatsPrinter} from './stats-printer';\nimport {AbstractRenderer} from './abstract-renderer';\n\nexport class StepRenderer extends AbstractRenderer {\n    private readonly framesFileName: string;\n    private readonly emptyFrameFileName: string;\n\n    constructor(args : Args,\n                private readonly workDir: WorkDir) {\n        super(args);\n        this.framesFileName = path.join(workDir.screenShotsDir, 'frames.txt');\n        this.emptyFrameFileName = path.join(workDir.screenShotsDir, 'empty.png');\n    }\n\n    public startEncoding() {\n        const empty = new PNG({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n            colorType: 6,\n        });\n        writeFileSync(this.emptyFrameFileName, PNG.sync.write(empty));\n    }\n\n    public addEmptyFrame(durationMs?: number) {\n        let frameDef = `file '${this.emptyFrameFileName}'\\n`;\n\n        if (durationMs) {\n            const durationSec = durationMs / 1000;\n            frameDef += `duration ${durationSec}\\n`;\n        }\n\n        appendFileSync(this.framesFileName, frameDef, 'utf8');\n    }\n\n    public addFrame(caption: Caption, png: PNGWithMetadata) {\n        const screenShotFileName = path.join(this.workDir.screenShotsDir, `screenshot_${caption.index}.png`);\n        writeFileSync(screenShotFileName, PNG.sync.write(png));\n\n        const durationSec = (caption.endTimeMs - caption.startTimeMs) / 1000;\n\n        appendFileSync(\n            this.framesFileName,\n            `file '${screenShotFileName}'\\nduration ${durationSec}\\n`,\n            'utf8');\n    }\n\n    public async endEncoding() {\n        console.log(`Encoding ${this.args.movOutputFile}...\\n`);\n        const statsPrinter = new StatsPrinter();\n\n        await new Promise((resolve, reject) => {\n            this.baseFfmpegCommand()\n                .input(this.framesFileName)\n                .inputOptions([\n                    '-f concat',    // concat frames from the frame list\n                    '-safe 0'       // to prevent errors related to unsafe filenames\n                ])\n                .outputOptions([\n                    `-vf fps=fps=${this.args.fps}`,  // Framerate\n                ])\n                .on('progress', (progress: Object) => {\n                    statsPrinter.print(progress);\n                })\n                .on('end', () => {\n                    console.log(`${this.args.movOutputFile} encoded`);\n                    resolve(this.args.movOutputFile);\n                })\n                .on('error', (err: any) => {\n                    reject(err);\n                })\n                .run();\n        });\n    }\n}","import * as puppeteer from 'puppeteer';\nimport {Args} from './cli';\n\nexport abstract class AbstractRecorder {\n    protected browser: puppeteer.Browser | null = null;\n    protected page: puppeteer.Page | null = null;\n\n    protected constructor(protected readonly args: Args) {\n    }\n\n    public abstract recordCaptionsVideo(indexHtml: string): Promise<void>;\n\n    protected async launchBrowser(indexHtml: string): Promise<puppeteer.ElementHandle | null> {\n        this.browser = await puppeteer.launch({\n            args: [\n                '--disable-web-security',           // Disable CORS\n                '--allow-file-access-from-files',   // Allow file access\n            ],\n            headless: true,\n        });\n        this.page = await this.browser.newPage();\n        await this.page.goto(`file://${indexHtml}`);\n        await this.page.setViewport({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n        });\n        await this.page.evaluate(() => {\n            return window.ready;\n        });\n\n        return this.page.$('#video');\n    }\n}","import * as puppeteer from 'puppeteer';\nimport {RealTimeRenderer} from './real-time-renderer';\nimport {Args} from './cli';\nimport {AbstractRecorder} from './abstract-recorder';\n\nexport class RealTimeRecorder extends AbstractRecorder {\n    constructor(args: Args,\n                private readonly videoRenderer: RealTimeRenderer) {\n        super(args);\n    }\n\n    public async recordCaptionsVideo(indexHtml: string) {\n        try {\n            await this.launchBrowser(indexHtml);\n            const cdpSession = await this.page!.createCDPSession();\n\n            await cdpSession.send(\n                'Emulation.setDefaultBackgroundColorOverride',\n                { color: { r: 0, g: 0, b: 0, a: 0 } }\n            );\n            await cdpSession.send('Animation.setPlaybackRate', {\n                playbackRate: 1,\n            });\n\n            cdpSession.on('Page.screencastFrame',\n                (frame) => this.handleScreenCastFrame(cdpSession, frame));\n\n            this.videoRenderer.startEncoding();\n\n            await cdpSession.send('Page.startScreencast', {\n                everyNthFrame: 1,\n                format: 'png',\n                quality: 100,\n            });\n\n            await this.page!.evaluate(() => {\n                return new Promise<void>((resolve) => {\n                    window.Player.onStop = resolve;\n                    window.Player.play();\n                })\n            });\n\n            await cdpSession.send('Page.stopScreencast');\n\n            this.videoRenderer.endEncoding();\n        } catch (error) {\n            console.error('Error during Puppeteer operation:', error);\n        } finally {\n            await this.browser?.close();\n        }\n    }\n\n    private async handleScreenCastFrame(cdpSession: puppeteer.CDPSession,\n                                        frame: puppeteer.Protocol.Page.ScreencastFrameEvent) {\n        const { sessionId, data } = frame;\n        await cdpSession.send('Page.screencastFrameAck', { sessionId });\n        const frameBuffer = Buffer.from(data, 'base64');\n        this.videoRenderer.addFrame(frameBuffer);\n    }\n}","export class FPSTicker {\n    private readonly interval: number;\n    private lastTime: number = 0;\n    private onTick: (deltaTime: number) => void = () => {};\n    private timeoutId: NodeJS.Timeout | null = null;\n\n    constructor(fps: number) {\n        this.interval = 1000 / fps;\n    }\n\n    public start(onTick: (deltaTime: number) => void = () => {}) {\n        this.onTick = onTick;\n        this.lastTime = Date.now();\n        this.tick();\n    }\n\n    public stop() {\n        clearTimeout(this.timeoutId!);\n    }\n\n    private tick() {\n        const now = Date.now();\n        const deltaTime = now - this.lastTime;\n\n        if (deltaTime >= this.interval) {\n            this.lastTime = now - (deltaTime % this.interval);  // Adjust for drift\n            this.onTick(deltaTime);\n        }\n\n        this.timeoutId = setTimeout(() => this.tick(), this.interval - (Date.now() - this.lastTime));\n    }\n}","import {PassThrough} from 'stream';\nimport {PNG} from 'pngjs';\nimport {Args} from './cli';\nimport {StatsPrinter} from './stats-printer';\nimport {AbstractRenderer} from './abstract-renderer';\nimport {FPSTicker} from './fps-ticker';\n\nexport class RealTimeRenderer extends AbstractRenderer {\n    private inputStream: PassThrough | null = null;\n    private lastFrame: Buffer;\n    private readonly ticker: FPSTicker;\n\n    constructor(args: Args) {\n        super(args);\n        const empty = new PNG({\n            width: this.args.videoWidth,\n            height: this.args.videoHeight,\n            colorType: 6,\n        });\n        this.lastFrame = PNG.sync.write(empty);\n        this.ticker = new FPSTicker(args.fps);\n    }\n\n    public startEncoding() {\n        this.inputStream = new PassThrough();\n        const statsPrinter = new StatsPrinter();\n\n        const command = this.baseFfmpegCommand()\n            .input(this.inputStream)\n            .inputOptions([\n                '-f image2pipe',                                        // Format of input frames\n                '-pix_fmt yuva444p10le',                                // Lossless setting\n                `-s ${this.args.videoWidth}x${this.args.videoHeight}`,  // Frame size\n                `-r ${this.args.fps}`,                                  // Framerate\n            ])\n            .outputOptions([\n                `-vf fps=fps=${this.args.fps}`,     // Framerate\n            ])\n            .on('start', () => {\n                console.log('FFmpeg process started.');\n            })\n            .on('progress', (progress) => {\n                statsPrinter.print(progress);\n            })\n            .on('end', () => {\n                console.log('FFmpeg process completed.');\n            })\n            .on('error', (err) => {\n                console.error('An error occurred:', err.message);\n            });\n\n        command.run();\n\n        // Produce frames in required rate\n        this.ticker.start(() => {\n            this.inputStream!.write(this.lastFrame);\n        });\n    }\n\n    public addFrame(frame: Buffer) {\n        this.lastFrame = frame;\n    }\n\n    public endEncoding() {\n        this.ticker.stop();\n        this.inputStream!.end();\n    }\n}","import * as puppeteer from 'puppeteer';\nimport * as cliProgress from 'cli-progress';\nimport {PNG, PNGWithMetadata} from 'pngjs';\nimport {Caption} from '../common/captions';\nimport {StepRenderer} from './step-renderer';\nimport {Args} from './cli';\nimport {AbstractRecorder} from './abstract-recorder';\n\nexport class StepRecorder extends AbstractRecorder {\n    constructor(args: Args,\n                private readonly captions: Caption[],\n                private readonly renderer: StepRenderer,\n                private readonly progressBar: cliProgress.SingleBar) {\n        super(args);\n    }\n\n    public async recordCaptionsVideo(indexHtml: string) {\n        this.progressBar.start(this.captions.length, 0);\n\n        try {\n            const videoElem = await this.launchBrowser(indexHtml);\n\n            this.renderer.startEncoding();\n\n            // Add empty frame before captions starts\n            const beginningTime = this.captions[0].startTimeMs;\n            this.renderer.addEmptyFrame(beginningTime);\n\n            for (let i = 0; i < this.captions.length; i++) {\n                const caption = this.captions[i];\n\n                await this.nextStep();\n\n                const screenShot = await this.takeScreenShot(videoElem!);\n                this.renderer.addFrame(caption, screenShot);\n\n                // Add delay before the next frame\n                if (i < this.captions.length - 1) {\n                    const idleDelay = this.captions[i + 1].startTimeMs - caption.endTimeMs;\n                    if (idleDelay) {\n                        this.renderer.addEmptyFrame(idleDelay);\n                    }\n                }\n\n                this.progressBar.increment();\n            }\n\n            this.progressBar.stop();\n            await this.renderer.endEncoding();\n        } catch (error) {\n            console.error('Error during Puppeteer operation:', error);\n        } finally {\n            await this.browser?.close();\n        }\n    }\n\n    private async nextStep() {\n        await this.page!.evaluate(() => {\n            window.Player.next();\n        });\n    }\n\n    private async takeScreenShot(elem: puppeteer.ElementHandle): Promise<PNGWithMetadata> {\n        const screenshotBuffer = await elem.screenshot({\n            encoding: 'binary',\n            omitBackground: true,\n        });\n        return PNG.sync.read(Buffer.from(screenshotBuffer));\n    }\n}","export class Timecode {\n    public readonly hours: number;\n    public readonly minutes: number;\n    public readonly seconds: number;\n    public readonly millis: number;\n\n    constructor(millis: number) {\n        this.millis = millis % 1000;\n\n        this.hours = Math.floor(millis / 3_600_000);\n        const remainingMillisAfterHours = millis % 3_600_000;\n        this.minutes = Math.floor(remainingMillisAfterHours / 60_000);\n        const remainingMillisAfterMinutes = remainingMillisAfterHours % 60_000;\n        this.seconds = Math.floor(remainingMillisAfterMinutes / 1000);\n    }\n\n    public get hh(): string {\n        return String(this.hours).padStart(2, '0');\n    }\n\n    public get mm(): string {\n        return String(this.minutes).padStart(2, '0');\n    }\n\n    public get ss(): string {\n        return String(this.seconds).padStart(2, '0');\n    }\n    public get SSS(): string {\n        return String(this.millis).padStart(3, '0');\n    }\n\n    public get asString(): string {\n        return `${this.hh}:${this.mm}:${this.ss},${this.SSS}`;\n    }\n}\n\nexport function toMillis(timecodes: string): number {\n    const parts = timecodes.split(/[:,]/).map(Number);\n\n    const hours = parts[0];\n    const minutes = parts[1];\n    const seconds = parts[2];\n    const milliseconds = parts[3];\n\n    return hours * 3_600_000    // hours to millis\n        + minutes * 60_000      // minutes to millis\n        + seconds * 1000        // second to millis\n        + milliseconds;\n}","import {toMillis} from './timecodes';\n\nconst indexLinePattern = /^\\d+$/;\nconst timecodesLinePattern = /^(\\d{2}:\\d{2}:\\d{2},\\d{3}) --> (\\d{2}:\\d{2}:\\d{2},\\d{3})$/;\nconst highlightedWordPattern = /^\\[(.+)](?:\\((\\w+)\\))?$/;\n\nexport interface Word {\n    rawWord: string;\n    isHighlighted: boolean;\n    isBeforeHighlighted: boolean;\n    isAfterHighlighted: boolean;\n    highlightClass?: string;\n}\n\nexport interface Caption {\n    index: number;\n    startTimeMs: number;\n    endTimeMs: number;\n    words: Word[];\n}\n\nexport function haveSameWords(caption1: Caption, caption2: Caption): boolean {\n    if (caption1.words.length != caption2.words.length) {\n        return false;\n    }\n\n    for (let i =0; i < caption1.words.length; i++) {\n        if (caption1.words[i].rawWord != caption2.words[i].rawWord) {\n            return false;\n        }\n    }\n\n    return true;\n}\n\nexport function readCaptions(srtContent: string): Caption[] {\n    const lines = srtContent.split('\\n');\n    const captions: Caption[] = [];\n\n    let index: number = 0;\n    let timecodesStart: string | null = null;\n    let timecodesEnd: string | null = null;\n\n    for (const line of lines) {\n        let match;\n        if ((match = line.match(indexLinePattern))) {\n            index = Number(line);\n        } else if ((match = line.match(timecodesLinePattern))) {\n            timecodesStart = match[1];\n            timecodesEnd = match[2];\n        } else if (line.length) {\n            const start = toMillis(timecodesStart!);\n            const end = toMillis(timecodesEnd!);\n\n            const words = readWords(line);\n\n            captions.push({\n                index,\n                words,\n                startTimeMs: start,\n                endTimeMs: end,\n            });\n        }\n    }\n\n    return captions;\n}\n\nexport function readWords(text: string): Word[] {\n    const words = splitText(text);\n    const highlightedIndex = words.findIndex(word => word.match(highlightedWordPattern));\n\n    const res: Word[] = [];\n\n    for (let i = 0; i < words.length; i++) {\n        const word = words[i];\n        const match = word.match(highlightedWordPattern);\n        const rawWord = match ? match[1] : word;\n        const highlightClass = match && match[2] ? match[2] : null;\n\n        const isHighlighted = Boolean(match);\n        const isBeforeHighlighted = Boolean(~highlightedIndex && !isHighlighted && i < highlightedIndex);\n        const isAfterHighlighted = Boolean(~highlightedIndex && !isHighlighted && i > highlightedIndex);\n\n        const wordObject: Word = {\n            rawWord,\n            isHighlighted,\n            isBeforeHighlighted,\n            isAfterHighlighted,\n        };\n\n        if (highlightClass) {\n            wordObject.highlightClass = highlightClass;\n        }\n\n        res.push(wordObject);\n    }\n\n    return res;\n}\n\nexport function splitText(text: string): string[] {\n    const words: string[] = [];\n\n    let currentWord = '';\n    let isCurrentHighlighted = false;\n\n    for (let i = 0; i < text.length; i++) {\n        const char = text[i];\n        const isWhitespace = /^\\s$/.test(char);\n        const isPunctuation = /[,.!?]/.test(char);\n\n        if (!isWhitespace) {\n            if (!isPunctuation) {\n                currentWord += char;\n                switch (char) {\n                    case '[':\n                    case '(':\n                        isCurrentHighlighted = true;\n                        break;\n                    case ']':\n                    case ')':\n                        isCurrentHighlighted = false;\n                        break;\n                }\n            } else {\n                if (currentWord) {\n                    currentWord += char;\n                } else {\n                    // Attach punctuation mark to the previous word\n                    words[words.length - 1] += ' ' + char;\n                }\n            }\n        } else {\n            // char is a whitespace\n            if (isCurrentHighlighted) {\n                currentWord += char;\n            } else if (currentWord) {\n                words.push(currentWord);\n                currentWord = '';\n            }\n        }\n    }\n\n    if (currentWord) {\n        words.push(currentWord);\n    }\n\n    return words;\n}","import {createServer} from 'http-server';\n\nexport class WebServer {\n    constructor(private readonly rootDir: string) {\n    }\n\n    public async start(relativePath = '') {\n        return new Promise<void>(async (resolve, reject) => {\n            try {\n                const server = createServer({ root: this.rootDir });\n                const port = await WebServer.getFreePort();\n\n                server.listen(port, async () => {\n                    try {\n                        const childProcess = await WebServer.openUrl(`http://127.0.0.1:${port}${relativePath}`);\n\n                        childProcess.on('close', () => {\n                            server.close(() => {\n                                resolve();\n                            });\n                        });\n                    } catch (error) {\n                        reject(error);\n                    }\n                });\n            } catch (error) {\n                reject(error);\n            }\n        });\n    }\n\n    private static async getFreePort(): Promise<number> {\n        const { default: getPort } = await import('get-port');\n        return getPort();\n    }\n\n    private static async openUrl(url: string) {\n        const { default: open } = await import('open');\n        return open(url, { wait: true });\n    }\n}","import {readFileSync} from 'fs';\nimport {Args, createProgressBar, parseArgs, printArgs} from './cli';\nimport {WorkDir} from './work-dir';\nimport {StepRenderer} from './step-renderer';\nimport {RealTimeRecorder} from './real-time-recorder';\nimport {RealTimeRenderer} from './real-time-renderer';\nimport {StepRecorder} from './step-recorder';\nimport {AbstractRecorder} from './abstract-recorder';\nimport {Caption, readCaptions} from '../common/captions';\nimport {WebServer} from '../common/web-server';\n\nfunction parseCaptions(srtCaptionsFile: string): Caption[] {\n    const captionsSrc = readFileSync(srtCaptionsFile, 'utf-8');\n    return readCaptions(captionsSrc);\n}\n\nfunction createRecorder(args: Args, captions: Caption[], workDir: WorkDir): AbstractRecorder {\n    if (args.css3Animations) {\n        const realTimeRenderer = new RealTimeRenderer(args);\n        return new RealTimeRecorder(args, realTimeRenderer);\n    } else {\n        const progressBar = createProgressBar();\n        const stepRenderer = new StepRenderer(args, workDir);\n        return  new StepRecorder(args, captions, stepRenderer, progressBar);\n    }\n}\n\nconst cliArgs = parseArgs();\nconst captions = parseCaptions(cliArgs.srtInputFile);\nconst workDir = new WorkDir(captions, cliArgs);\n\n(async () => {\n    try {\n        const indexHtml = workDir.setup();\n        printArgs(cliArgs);\n\n        if (!cliArgs.isPreview) {\n            const recorder = createRecorder(cliArgs, captions, workDir);\n            await recorder.recordCaptionsVideo(indexHtml);\n        } else {\n            console.log('Launching preview server...');\n            const previewServer = new WebServer(workDir.rootDir);\n            await previewServer.start();\n        }\n        console.log('Done!');\n    } catch (err) {\n        console.error('Error occurred:', err);\n    } finally {\n        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\ No newline at end of file
diff --git a/src/script/fps-ticker.ts b/src/script/fps-ticker.ts
new file mode 100644
index 0000000..c7fd7e0
--- /dev/null
+++ b/src/script/fps-ticker.ts
@@ -0,0 +1,32 @@
+export class FPSTicker {
+    private readonly interval: number;
+    private lastTime: number = 0;
+    private onTick: (deltaTime: number) => void = () => {};
+    private timeoutId: NodeJS.Timeout | null = null;
+
+    constructor(fps: number) {
+        this.interval = 1000 / fps;
+    }
+
+    public start(onTick: (deltaTime: number) => void = () => {}) {
+        this.onTick = onTick;
+        this.lastTime = Date.now();
+        this.tick();
+    }
+
+    public stop() {
+        clearTimeout(this.timeoutId!);
+    }
+
+    private tick() {
+        const now = Date.now();
+        const deltaTime = now - this.lastTime;
+
+        if (deltaTime >= this.interval) {
+            this.lastTime = now - (deltaTime % this.interval);  // Adjust for drift
+            this.onTick(deltaTime);
+        }
+
+        this.timeoutId = setTimeout(() => this.tick(), this.interval - (Date.now() - this.lastTime));
+    }
+}
\ No newline at end of file
diff --git a/src/script/real-time-renderer.ts b/src/script/real-time-renderer.ts
index e39f18e..cbef83e 100644
--- a/src/script/real-time-renderer.ts
+++ b/src/script/real-time-renderer.ts
@@ -3,11 +3,12 @@ import {PNG} from 'pngjs';
 import {Args} from './cli';
 import {StatsPrinter} from './stats-printer';
 import {AbstractRenderer} from './abstract-renderer';
+import {FPSTicker} from './fps-ticker';
 
 export class RealTimeRenderer extends AbstractRenderer {
     private inputStream: PassThrough | null = null;
-    private intervalId: NodeJS.Timeout | null = null;
     private lastFrame: Buffer;
+    private readonly ticker: FPSTicker;
 
     constructor(args: Args) {
         super(args);
@@ -17,6 +18,7 @@ export class RealTimeRenderer extends AbstractRenderer {
             colorType: 6,
         });
         this.lastFrame = PNG.sync.write(empty);
+        this.ticker = new FPSTicker(args.fps);
     }
 
     public startEncoding() {
@@ -31,6 +33,9 @@ export class RealTimeRenderer extends AbstractRenderer {
                 `-s ${this.args.videoWidth}x${this.args.videoHeight}`,  // Frame size
                 `-r ${this.args.fps}`,                                  // Framerate
             ])
+            .outputOptions([
+                `-vf fps=fps=${this.args.fps}`,     // Framerate
+            ])
             .on('start', () => {
                 console.log('FFmpeg process started.');
             })
@@ -47,10 +52,9 @@ export class RealTimeRenderer extends AbstractRenderer {
         command.run();
 
         // Produce frames in required rate
-        const intervalDuration = Math.round(1000 / 30);
-        this.intervalId = setInterval(() => {
+        this.ticker.start(() => {
             this.inputStream!.write(this.lastFrame);
-        }, intervalDuration);
+        });
     }
 
     public addFrame(frame: Buffer) {
@@ -58,7 +62,7 @@ export class RealTimeRenderer extends AbstractRenderer {
     }
 
     public endEncoding() {
-        clearTimeout(this.intervalId!);
+        this.ticker.stop();
         this.inputStream!.end();
     }
 }
\ No newline at end of file
diff --git a/src/script/step-recorder.ts b/src/script/step-recorder.ts
index 432e2fb..a5505f9 100644
--- a/src/script/step-recorder.ts
+++ b/src/script/step-recorder.ts
@@ -45,9 +45,6 @@ export class StepRecorder extends AbstractRecorder {
                 this.progressBar.increment();
             }
 
-            // Finish with en empty frame
-            this.renderer.addEmptyFrame();
-
             this.progressBar.stop();
             await this.renderer.endEncoding();
         } catch (error) {
diff --git a/src/script/step-renderer.ts b/src/script/step-renderer.ts
index 0ca4224..29d37ba 100644
--- a/src/script/step-renderer.ts
+++ b/src/script/step-renderer.ts
@@ -61,6 +61,9 @@ export class StepRenderer extends AbstractRenderer {
                     '-f concat',    // concat frames from the frame list
                     '-safe 0'       // to prevent errors related to unsafe filenames
                 ])
+                .outputOptions([
+                    `-vf fps=fps=${this.args.fps}`,  // Framerate
+                ])
                 .on('progress', (progress: Object) => {
                     statsPrinter.print(progress);
                 })