[FFmpeg-devel] [Internet]Re: [PATCH v2 5/7] avcodec/mediacodecenc: remove the strategy to create DTS

[Zhao Zhili]

> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Tomas Härdin
> Sent: 2023年1月4日 22:00
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [Internet]Re: [PATCH v2 5/7] avcodec/mediacodecenc: remove the strategy to create DTS
> 
> ons 2023-01-04 klockan 19:31 +0800 skrev zhilizhao(赵志立):
> >
> > > On Jan 4, 2023, at 18:16, Anton Khirnov <anton at khirnov.net> wrote:
> > >
> > > Does this mean the encoder will produce packets with
> > > dts=AV_NOPTS_VALUE?
> >
> > MediaCodec should not encode B frames by default, so dts = pts by
> > default.
> > B frames can be enabled explicitly, in that case dts is
> > AV_NOPTS_VALUE.
> >
> > Android system’s MP4 muxer works very hard to recreate dts to
> > workaround
> > the limitation of MediaCodec API. It create ‘valid’ but almost
> > useless
> > files with a lot of jitters.
> 
> Maybe we should disallow B-frames entirely until the MediaCodec API is
> fixed so as to not add to this mess?

There are some valid usecases. For example, RTP works fine without DTS.
With some restriction or precondition, use can create DTS too. So I'd like
to keep the feature.

> 
> /Tomas
> 
> _______________________________________________
> 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".