MotionCam MCRAW mounter with a FUSE Filesystem

A FUSE-based virtual filesystem that mounts all .mcraw files in the current directory, exposing each frame as a DNG and the audio as audio.wav.

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Demo

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Downloads

Releases page

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Prerequisites to run

• Dependencies:
  • macFUSE (macOS)
    • macOS: Download and install from macFUSE

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Prerequisites for building

• A C++17-capable compiler (e.g. g++, clang++)
• CMake ≥ 3.10
• Dependencies:
  • macFUSE (macOS)
    • macOS: Download and install from macFUSE
  • nlohmann/json
  • tinydngwriter
  • audiofile (for WAV output)

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Building

1. Clone the repo:

   git clone https://github.com/baso53/mcraw-mounter
   cd mcraw-mounter

2. Create and enter a build directory:

   mkdir build && cd build

3. Configure and build:

   cmake ..
   make

   This produces one binary:
   • mcraw-mounter-fuse

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FUSE-Based Virtual Filesystem

Mounts a directory mcraws in your working folder. After mounting you’ll see:

mcraws/
├── 007-VIDEO_24mm-240328_141729.0/
│   ├── frame_000000.dng
│   ├── frame_000001.dng
│   └── audio.wav
└── another-recording/ …

How It Works

1. On startup, mcraw-mounter-fuse scans the folder where the application is run from for all .mcraw files.
2. For each file it creates an in-memory context:
   • Loads container metadata (black/white levels, CFA pattern, matrices, orientation)
   • Builds a list of frame timestamps
   • Decodes & caches the frames for reading by the kernel
   • Extracts and converts all audio chunks into an in-memory WAV buffer
3. ls mcraws/<basename>/ lists frame_*.dng and audio.wav.
4. Opening a frame-file decodes (or retrieves from cache) the RAW frame as a valid DNG.
5. Reading audio.wav serves the constructed WAV data.

Usage

./mcraw-mounter-fuse
# DEBUG: [007-VIDEO_...0.mcraw] found N frames
# Mounts at ./mcraws

or

• Copy the mcraw-mounter into the folder with your .mcraw files and run it from there.

When done:

umount ./mcraws

or

• unmount from Finder.

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Tips

Don't open the mounter folders in Finder if you don't have to, since MacOS will start thumbnail generation process, which will take a lot of RAM.

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Sample File

Download a sample .mcraw:

https://storage.googleapis.com/motioncamapp.com/samples/007-VIDEO_24mm-240328_141729.0.mcraw

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MotionCam Pro

MotionCam Pro is an Android app for capturing RAW video.
Get it on the Play Store.