Platform is Linux, CLI tools is needed.

There are two files: one for left eye another for right eye. I search a way to compose it into single 3D MKV (or any other container) with alternate frame format.

I tried FFmpeg filter framepack and MKV metadata stereo_mode=block_lr:

ffmpeg -i input_l.mkv -i input_r.mkv -filter_complex framepack=frameseq -metadata stereo_mode=block_lr -y out.mkv

But result is short, not all frames repacked/remuxed: input files contains 500 frames, out.mkv contains only 32 one and has doubled FPS.

I expect, that output file will contain 1000 frames.

Any tools are welcomed.

Another related question: is it possible to do such muxing without frame re-encoding? Input files already well-coded and I want just repack them into 3D video format.

PS FFmpeg version 4.2.1

1 Answer 1


framepack is buggy filter. Use framepack=frameseq,settb=1/50,setpts=N, where 50 is frame rate you want to use, and it should be twice of input framerate.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.