[FFmpeg-devel] [PATCH] avformat/mxf: support MCA audio information

[Pierre-Anthony Lemieux]

On Tue, Oct 12, 2021 at 12:29 PM Marton Balint <cus at passwd.hu> wrote:
>
>
>
> On Tue, 12 Oct 2021, Tomas Härdin wrote:
>
> > mån 2021-10-11 klockan 18:32 +0200 skrev Marc-Antoine Arnaud:
> >> ---
> >>  libavformat/mxf.h    |   1 +
> >>  libavformat/mxfdec.c | 276
> >> ++++++++++++++++++++++++++++++++++++++++++-
> >>  2 files changed, 271 insertions(+), 6 deletions(-)
> >
> > Did we reach a consensus on this? While I think signalling ffmpeg to
> > create a remap filter is a good idea, I don't know whether we have any
> > mechanism for that at the moment. If we don't then perhaps that
> > shouldn't hold up this patch?
>
> I don't think there is any support for such rerouting in ffmpeg, so I
> believe a demuxer option to turn on/off in-demuxer rerouting is the best
> we can come up with if we don't want to delay this feature.

I recommend that rerouting be enabled by default if MCA subdescriptors
are present since MCA subdescriptors are optional in MXF and, by
including them, the author explicitly signals a specific channel
order.

>
> On the other hand, as far as I see, my comments have not been addressed
> yet:
>
> http://ffmpeg.org/pipermail/ffmpeg-devel/2021-September/285856.html
>
> Regards,
> Marton
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