[Question] Container Changing

[jwynn6]

I have some m2ts files I'd like to re-encode into mkv containers. Running this tool seems to be outputting an m2ts file as well, does using the -o option to specify an output file name somehow trigger a container change to the extension specified?

[alexheretic]

Yep, by default the same extension as input is used (with some exceptions). But you can specify the output name & extension. The final ffmpeg invocation will use that to infer container.

…

On Fri, 14 Oct 2022, 17:59 jwynn6, ***@***.***> wrote: I have some m2ts files I'd like to re-encode into mkv containers. Running this tool seems to be outputting an m2ts file as well, does using the -o option to specify an output file name somehow trigger a container change to the extension specified? — Reply to this email directly, view it on GitHub <#55>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AARZHV2IGLOOGD44C33NRPLWDHJU3ANCNFSM6AAAAAARFTNEGU> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[jwynn6]

Thanks! Awesome tool.

[jwynn6]

I'm getting 'Error: ffmpeg to-output exit code Some(1)' when encoding with -o and a container change. Using -o and maintaining the same container seems to work fine.

I am using the latest ffmpeg compiled from source.

[alexheretic]

Error: ffmpeg to-output exit code Some(1)

Yes this isn't very helpful output, I'm meaning to improve this by showing the ffmpeg output (#1) hopefully I'll have time soon!

For now, try converting container using ffmpeg directly to see it's output. Maybe ffmpeg can't do this particular conversion for some reason?

[alexheretic]

I tested sample_1920x1080.m2ts and it seems to work fine.

$ ab-av1 auto-encode -i sample_1920x1080.m2ts --max-encoded-percent 9999 --preset 12 -o tmp.mp4
  Searching 00:00:49 ######################################### (crf 24, VMAF 95.36, size 498%)
  Encoding  00:00:10 ######################################### (73 fps, eta 0s)
Encoded 67.73 MiB (461%)

The samples are encoded into .m2ts format if you use an ffmpeg encoder rather than svt-av1. But that seems to work ok too.

Perhaps this is an issue with your ffmpeg (or maybe OS)? Can you try

ffmpeg -i sample_1920x1080.m2ts tmp.mp4

[alexheretic]

I think this should be addressed now on the next release, related #70