[FFmpeg-devel] [PATCH] libavformat/prompeg.c: Add parameters to control FEC ports.

[Romain Beauxis]

Le ven. 13 déc. 2024 à 18:07, Kieran Kunhya via ffmpeg-devel
<ffmpeg-devel at ffmpeg.org> a écrit :
>
> On Fri, 13 Dec 2024, 16:38 Romain Beauxis, <romain.beauxis at gmail.com> wrote:
>
> > Le ven. 13 déc. 2024 à 16:42, Romain Beauxis
> > <romain.beauxis at gmail.com> a écrit :
> > >
> > > This patch adds parameters to pick specific ports for the two FEC error-
> > > correction streams associated with a Pro-MPEG CoP #3-R2 FEC streams.
> > >
> > > Radio France is currently interested in using this technology to do
> > > error-correction on some of their stream. In this context, they may not
> > > have full control over their available UDP ports and would like to be
> > able to
> > > pick any two ports for these streams.
> > >
> > > The specifications for this protocol is available online:
> > https://www.yumpu.com/en/document/read/8808550/pro-mpeg-code-of-practice-3-release-2-pro-mpeg-forum
> > >
> > > In section 5.2, page 14, port assignments for the FEC streams are under
> > > "shall" thus the changes in this patch should still be valid w.r.t. the
> > > specs.
> >
> > A bit surprised, as I re-read the specs now, to learn that "shall" is
> > to be interpreted as a mandatory requirement while, usually, "must" is
> > used. My understanding of the English language has failed me once
> > more!
> >
> > Still, I believe that this patch should be useful (shall, if
> > considering the use-case I came from!).
> >
> >
> What FEC receivers allow custom port selection? All the ones I've seen
> expect +2 and +4. If they are internally mapping to +2 and +4, I am not
> sure it's a good idea that FFmpeg features are added to work around
> someone's firewall limitation.

I am not aware of any.

I can see your point.

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