From: "Tomas Härdin" <git@haerdin.se>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v3 3/7] avcodec/mediacodecenc: use bsf to handle crop
Date: Tue, 20 Dec 2022 19:24:36 +0100
Message-ID: <7fc5d621ee203d6059bebd47283df33f33152af8.camel@haerdin.se> (raw)
In-Reply-To: <tencent_F9B25B9234758048341F3ECD57539D4EE009@qq.com>
tor 2022-12-15 klockan 01:37 +0800 skrev Zhao Zhili:
> On Wed, 2022-12-14 at 18:08 +0100, Tomas Härdin wrote:
>
> >
> > I think we might want something for this inside lavf somewhere, so
> > that
> > encoders can signal dimension alignment requirements. Some
> > containers
> > (MXF, MOV) support such cropping in a codec-agnostic manner.
>
> From my own experience, dimension mismatch between codec and
> container
> makes a lot of trouble. ISO base format specification specified how
> to
> crop/scale after decoding clear, however, I don't think it has been
> widely supported, including FFmpeg. We can fix that inside of FFmpeg,
> but we should avoid such cases as much as we can.
This is the difference between stored, sampled and display dimensions
in MXF. For example 1080i video has StoredHeight = 544, SampledHeight =
540 and DisplayHeight = 540 (see AS-10). When you add VBLANK and HBLANK
to the mix then all three dimensions are typically different.
Anyway specifying at the NAL level whenever the essence isn't a
multiple of 16x16 is obviously normal. The only complication I can
think of is 4:2:2 and 4:4:4. Does MC require 16x16 also in those cases?
I'd expect 16x8 and 8x8 respectively.
/Tomas
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next prev parent reply other threads:[~2022-12-20 18:24 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 [this message]
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
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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