[FFmpeg-user] Metadata text length

[Richard F]

I think the patch here: https://patchwork.ffmpeg.org/patch/12047 has
introduced a limit to the length of plain ASCII text that can be written
into mpegts metadata fields. I'm seeing ffmpeg exit when trying to write
a string of more than ~150 characters with "Too long service or provider
name".

Is there a designed or documented limit - I can't see one from a brief
look at the code, perhaps I'm missing something ?

Thanks