[FFmpeg-user] MP4 with 9 subtitle streams

[Mark Filipak]

On Sat, Sep 23, 2023 at 2:29 AM Paul B Mahol <onemda at gmail.com> wrote:
>
> On 9/23/23, Mark Filipak <markfilipak.imdb at gmail.com> wrote:
> > Why doesn't this work? I made an MP4 with 9 subtitle streams via
> > HandBrake. I think ffmpeg and HandBrake use the same libraries. I need
> > to use ffmpeg. I'm grateful for any help.
>
> Try to read last messages from output, they show you the problem.

"codec not currently supported in container [mp4]" is obviously not
true. I've proven that MP4 does support at least 9 SRT subtitles.

Is there a workaround? Perhaps similar to 'libx265 -x265-params'?