[FFmpeg-user] Yes or No? About the processing pipeline.

[Paul B Mahol]

On Thu, Jun 19, 2025 at 10:37 AM Mark Filipak <
markfilipak.imdb-at-gmail.com at ffmpeg.org> wrote:

> On 18/06/2025 23.56, Carl Zwanzig wrote:
> > On 6/18/2025 2:41 PM, Mark Filipak wrote:
> >> Z, how am I or anyone to know what "sost#0:2" means? I don't even know
> what "sost" means.
> > (does that specifically matter? I don't think so.)
> >
> > After that.... RTFM? (I think you've used -map before so probably
> understand the concept of stream
> > specifiers.)
> >
> >
> > "5.1 Stream specifiers"
> > stream_type[:additional_stream_specifier]
> > [...]
> >      stream_type is one of following: ’v’ or ’V’ for video, ’a’ for
> audio, ’s’ for subtitle, ’d’ for
> > data, and ’t’ for attachments. ’v’ matches all video streams, ’V’ only
> matches video streams which
> > are not attached pictures, video thumbnails or cover arts.
> >
> > and
> >
> > #stream_id or i:stream_id
> >      Match the stream by stream id (e.g. PID in MPEG-TS container).
> >
> >
> > Likewise "4.1.1 Automatic stream selection" tells us-
> > It will select that stream based upon the following criteria:
> > [...]
> >      for subtitles, it is the first subtitle stream found but there’s a
> caveat. The output format’s
> > default subtitle encoder can be either text-based or image-based, and
> only a subtitle stream of the
> > same type will be chosen.
> > (If mp4 only supports text subtitles and dvds have only images, of
> course it'll cough up an error.)
> >
> >
> > The output -told- you that #0:2 is subtitles, so an error message
> containing that is probably about
> > those subtitles. Seemed obvious to me and I don't work much with ffmpeg.
> >
> > I suggest you reread the basic ffmpeg manual at
> https://www.ffmpeg.org/ffmpeg.html; it's always good
> > to reread the basics, sometimes useful things pop out afresh.
>
> Take a pill, Z.
>
> You folks will never understand a user's perspective. I'm supposed to know
> what "sost#0:2" means
> because... of what? Because I'm supposed to be psychic?
>

Fixed:
https://github.com/librempeg/librempeg/commit/d572c8dae396fdcb719b030faafdc036104ae94d


>
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>