[FFmpeg-devel] [RFC PATCH 3/3] HACK: avformat: rawenc: allow to output a raw PRFT

[Clément Péron]

Hi Paul

On Fri, 22 Sept 2023 at 11:27, Paul B Mahol <onemda at gmail.com> wrote:
>
> On Fri, Sep 22, 2023 at 10:38 AM Clément Péron <peron.clem at gmail.com> wrote:
>
> > Hi Andreas,
> >
> > On Fri, 22 Sept 2023 at 09:58, Andreas Rheinhardt
> > <andreas.rheinhardt at outlook.com> wrote:
> > >
> > > Clément Péron:
> > > > Hi Michael, Andreas,
> > > >
> > > > On Thu, 21 Sept 2023 at 22:50, Andreas Rheinhardt
> > > > <andreas.rheinhardt at outlook.com> wrote:
> > > >>
> > > >> Michael Niedermayer:
> > > >>> On Thu, Sep 21, 2023 at 02:17:00PM +0200, Clément Péron wrote:
> > > >>>> Output the producer reference time to a dirty raw output.
> > > >>>>
> > > >>>> Signed-off-by: Clément Péron <peron.clem at gmail.com>
> > > >>>> ---
> > > >>>>  libavformat/rawenc.c | 122
> > +++++++++++++++++++++++++++++++++++++++++++
> > > >>>>  1 file changed, 122 insertions(+)
> > > >>>
> > > >>> this breaks fate-filter-volume and others
> > > >>> (Segmentation fault)
> > > >>>
> > > >>> I can rerun it with debug symbols and provide peoper gdb output
> > > >>> but i suspect given this has "HACK" in the title you are aware of
> > this
> > > >
> > > > The "HACK" tag meaning was not supposed to be: "it's ok if it
> > > > segfaults", but more to trigger a discussion is it possible to
> > > > properly support an output timestamp in the raw video demux, and if
> > > > yes how to do it :)
> > >
> > > If you need a timestamp for raw video, then use a proper container and
> > > not raw video. In fact, this patch basically creates new formats
> > > different from all the raw formats.
> >
> > Yes I agree, but I do not want to add too much overhead nor
> > computation processing or memory copy to my pipeline just to mux and
> > demux between ffmpeg and my python script.
> >
> > The idea is to have a very light structure to easily pipe it.
> >
> > I'm not familiar with audio/video container but it seems to me that
> > parsing containers are not very light no?
> >
> >
> Containers range from almost no processing like .y4m to complex monsters
> like .mxf

.y4m doesn't contain a timestamp either, and I don't want to use a
complex container :),

>
> This patch is hack and approach/solution it tries is flawed.

100% agree with you that's why I prefix the patch with "HACK:",

Regards,
Clement


>
>
> > Thanks,
> > Clement
> >
> >
> > >
> > > - Andreas
> > >
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