v1.17.2 -- Converting mkv to mp4 with ffmpeg generates a bad mp4 file

[tyndale]

Hi, I can generate an mkv with the mac version of MakeMKV beta. The problem is when I try to convert it to mp4 and the generated mp4 can't be opened.

both

ffmpeg -i B1_t00.mkv -codec copy out.mp4

and

ffmpeg -i B1_t00.mkv -c:v copy -c:a aac -b:a 128k out.mp4

don't generate a usable mp4.

Any ideas?

[dcoke22]

Are you sure whatever video and audio codecs are present in your source .mkv file are supported by the .mp4 container AND supported by your player software?

MP4 file format @ Wikipedia

Change video file container to mp4 @ Stack Overflow