Add is_image to property pool

Author: TheAMM

README.md

@@ -134,7 +134,8 @@ Tricky examples of the property expansion:
 | `path` | `string` | full source path - may be a network path, so beware |
 | `pos` | `number` | Current playback position (float), format it with `${#pos:TIMEFORMAT}`! |
 | `unique` | `number` | A sequence number. The script will choose the first available filename, starting with `unique` as 1 and counting up. Use with `${%...}` |
-| `full` | `boolean` | Flag to specify which filename is being expanded - the cropped (`false`) output or the intermediary full-size image (`true`). Use with `${?...}` and `${-...}` |
+| `full` | `boolean` | Flag to specify which filename is being expanded - the cropped (`false`) output or the intermediary full-size image (`true`). Use with `${?...}` and `${!...}` |
+| `is_image` | `boolean` | Flag to tell if the current file is likely an image. Use with `${?...}` and `${!...}` |
 | `crop_w` | `number` | Width of the crop |
 | `crop_h` | `number` | Height of the crop |
 | `crop_x` | `number` | Left edge of the crop |

src/main.lua

@@ -40,6 +40,7 @@ end
 function expand_output_path(cropbox)
     local filename = mp.get_property_native("filename")
     local playback_time = mp.get_property_native("playback-time")
+    local duration = mp.get_property_native("duration")
 
     local filename_without_ext, extension = filename:match("^(.+)%.(.-)$")
 
@@ -52,6 +53,7 @@ function expand_output_path(cropbox)
       pos = mp.get_property_native("playback-time"),
 
       full = false,
+      is_image = (duration == 0 and playback_time == 0),
 
       crop_w = cropbox.w,
       crop_h = cropbox.h,

src/options.lua

@@ -28,6 +28,7 @@ script_options:add_options({
   crop_x2     - right
   crop_y2     - bottom
   full        - boolean denoting a full (temporary) screenshot instead of crop
+  is_image    - boolean denoting the source file is likely an image (zero duration and position)
   unique      - counter that will increase per each existing filename, until a unique name is found]]},
 
   {"output_format", "png",