[FFmpeg-user] Fifo muxer with ISMV output results in corrupted video

[Louis Geuten]

Hello andrei,

I know the command is a bit messy, but this is not a contradiction.
There are two separate outputs, one for video with the -an, and another
with the audio mapping and an audio codec specified.
AFAIK they are not used together.

These commands are generated "on the fly" from my software, and they can be
used quite a lot of use-cases.
If you have any other useful critique of the command here, please go ahead
and I'll improve it.

Regards,
Louis

On Thu, 25 Jun 2020 at 15:05, andrei ka <andrei.k.gml at gmail.com> wrote:

> pretty messy command with a few redundancies,  but the funniest one -an and
> -c:a combo
>
> Le jeu. 25 juin 2020 à 14:35, Gyan Doshi <ffmpeg at gyani.pro> a écrit :
>
> >
> >
> > On 25-06-2020 05:17 pm, Louis Geuten wrote:
> > > Hello,
> > >
> > > It seems that using the argument "-flags +global_header" with the
> > bitstream
> > > filter "dump_extra" fixes the issue.
> > > Why this isn't needed when directly muxing with ISMV instead of fifo is
> > > beyond me.
> >
> > Each muxer has a list of flags; those relevant to encoders are conveyed
> > by ffmpeg to that encoder.
> >
> > The fifo muxer isn't a muxer per-se but an intermediary layer dressed up
> > as a muxer. It won't necessarily share the relevant flags with the child
> > muxer, so they have to be manually set by the user.
> >
> > Gyan
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