From: "Tomas Härdin" <git@haerdin.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v2 5/7] avcodec/mediacodecenc: remove the strategy to create DTS
Date: Mon, 12 Dec 2022 16:28:44 +0100
Message-ID: <22621577bd7ccd1da3bab3e16740528ffd1d82fb.camel@haerdin.se> (raw)
In-Reply-To: <tencent_F315AB514E5570E32D6E9AC0407A9ADF9F08@qq.com>
ons 2022-12-07 klockan 17:31 +0800 skrev Zhao Zhili:
> From: Zhao Zhili <zhilizhao@tencent.com>
>
> Use input PTS as DTS has multiple problems:
> 1. If there is no reordering, it's better to just use the output
> PTS as DTS, since encoder may change the timestamp value (do it
> on purpose or rounding error).
>
> 2. If there is reordering, input PTS should be shift a few frames
> as DTS to satisfy the requirement of PTS >= DTS. I can't find a
> reliable way to determine how many frames to be shift. For example,
> we don't known if the encoder use hierarchical B frames. The
> max_num_reorder_frames can be get from VUI, but VUI is optional.
>
> 3. Encoder dropping frames makes the case worse. Android has an
> BITRATE_MODE_CBR_FD option to allow it explicitly.
Don't we already have code to parse this stuff from h.264 streams?
/Tomas
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next prev parent reply other threads:[~2022-12-12 15:28 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 [this message]
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
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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