From: "Zhao Zhili" <quinkblack@foxmail.com>
To: "'FFmpeg development discussions and patches'" <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [Internet]Re: [PATCH v2 5/7] avcodec/mediacodecenc: remove the strategy to create DTS
Date: Wed, 4 Jan 2023 22:46:52 +0800
Message-ID: <tencent_E801CEAD4542B301C85773F5937155C80905@qq.com> (raw)
In-Reply-To: <0f8450334ad0ee906fdb0614572c997fcf3ee252.camel@haerdin.se>
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Tomas Härdin
> Sent: 2023年1月4日 22:00
> To: FFmpeg development discussions and patches <ffmpeg-devel@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@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
>
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next prev parent reply other threads:[~2023-01-04 14:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20221207093122.553668-1-quinkblack@foxmail.com>
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 1/7] avcodec/mediacodecenc: make each encoder has its own option Zhao Zhili
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 2/7] avcodec/mediacodecenc: add bitrate_mode option Zhao Zhili
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 3/7] avcodec/mediacodecenc: add level option Zhao Zhili
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 4/7] avcodec/mediacodecenc: use bsf to handle crop Zhao Zhili
2022-12-09 17:22 ` [FFmpeg-devel] [PATCH v3 3/7] " Zhao Zhili
2022-12-12 15:27 ` Tomas Härdin
2022-12-13 3:20 ` "zhilizhao(赵志立)"
2022-12-14 17:08 ` Tomas Härdin
2022-12-14 17:19 ` Tomas Härdin
2022-12-14 17:37 ` Zhao Zhili
2022-12-14 17:43 ` Zhao Zhili
2022-12-20 18:24 ` Tomas Härdin
2022-12-21 7:17 ` "zhilizhao(赵志立)"
2022-12-21 10:06 ` Tomas Härdin
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 5/7] avcodec/mediacodecenc: remove the strategy to create DTS Zhao Zhili
2022-12-12 15:28 ` Tomas Härdin
2022-12-13 2:55 ` "zhilizhao(赵志立)"
2022-12-14 17:31 ` Tomas Härdin
2023-01-04 10:16 ` Anton Khirnov
2023-01-04 11:31 ` [FFmpeg-devel] [Internet]Re: " "zhilizhao(赵志立)"
2023-01-04 13:59 ` Tomas Härdin
2023-01-04 14:46 ` Zhao Zhili [this message]
2023-01-04 15:15 ` Anton Khirnov
2023-01-04 16:12 ` Zhao Zhili
2023-01-05 8:07 ` Anton Khirnov
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 6/7] avcodec/mediacodecenc: add max-bframes support Zhao Zhili
2022-12-07 9:31 ` [FFmpeg-devel] [PATCH v2 7/7] avcodec/mediacodecenc: add pts_as_dts option Zhao Zhili
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