[FFmpeg-devel] [PATCH 2/2] avcodec: add an AVCodecContext flag to export A53/SCTE20/DVD CC side data on demand

[Anton Khirnov]

Quoting lance.lmwang at gmail.com (2022-05-11 15:30:37)
> On Wed, May 11, 2022 at 02:00:10PM +0200, Anton Khirnov wrote:
> > Quoting lance.lmwang at gmail.com (2022-05-08 09:17:01)
> > > From: Limin Wang <lance.lmwang at gmail.com>
> > > 
> > > some samples include both A53 and SCTE20 data. Before the commit, both
> > > of the will be exported, so the CC data will be repeated or garbarge
> > 
> > Why would it be garbage? That sounds like a bug.
> > Why can't we just export both?
> for A53/SCTE20/DVDCC are exprted by A53_CC side data and they're sharing
> the same a53_buf_ref to store the data, so if stream contains CC wrapped
> as ATSC A53 packets + the same data wrapped as SCTE-20 packets, the CC
> data will repeated. We can consider to add a new side data type if necessary,
> but it's preferable to export A53_CC even it's SCTE20, so we can't export
> both by A53_CC still.

Does this apply to anything other than mpeg2? If not, it should be a
codec-private option rather than a new global flag.

-- 
Anton Khirnov