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

[Paul B Mahol]

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

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


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