[FFmpeg-user] Subtitles disappear

[Moritz Barsnick]

On Mon, Jan 04, 2021 at 09:58:34 +0100, Michael Koch wrote:
> For copying the subtitles from the input to the output,
> -c:s copy
> might work. I haven't tested it.

Since MP4 only supports "timed text" subtitles, this will only work if
the source MKV also contains this type of subtitles.

Had Cecil shown us ffmpeg's complete console output, we would know what
his source delivers. MKV can carry all types of subtitles. If Cecil's
MKV contains text based subtitles, these can usually be converted by
ffmpeg. If Cecil's MKV contains picture based subtitles (e.g. Blu-ray
PGS, or DVD subs), these cannot be converted to text based subtitles by
ffmpeg.

Cheers,
Moritz