Untrunc

Restore a damaged (truncated) mp4, m4v, mov, 3gp video. Provided you have a similar not broken video. And some luck.

You need:

• Another video file which isn't broken
• Basic ability to use a command line (GUI exists)

AWS Lambda Compatible Build

This is a fork specifically configured for AWS Lambda deployment. For building a binary compatible with AWS Lambda:

# Build for Lambda (requires Docker)
./build-lambda.sh

This creates a stripped x86_64 ELF binary at lambda-build/untrunc, built inside the AWS Lambda Python 3.13 runtime image. It is dynamically linked against the Lambda runtime's own glibc/libstdc++/libm/libgcc_s (all resolve to /lib64/ in the Lambda environment), so it runs as a Lambda layer without bundling any libraries. The build applies ffmpeg-mathops.patch (upstream FFmpeg fix effadce6c75) so FFmpeg 6.0 compiles with binutils >= 2.41 shipped by the Lambda image.