From: Nicolas Gaullier <nicolas.gaullier@cji.paris>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] avformat/mxfenc: fix stored/sampled/displayed width/height
Date: Mon, 16 Jan 2023 14:00:08 +0000
Message-ID: <MR1P264MB2483D57F0385E321C40A038B9BC19@MR1P264MB2483.FRAP264.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <0af7e930-9ec7-dc81-95bc-939eb21e2da0@mediaarea.net>
>Before the patch:
>- stored values were rounded to upper 16 multiple also for formats not using macroblocks (should be st->codecpar->width and
>st->codecpar->height when not MPEG formats; note that I found no other
>muxer doing the rounding for AVC, only for MPEG-2 Video, but I find no reason in specs for doing the difference so I kept the rounding for AVC)
>- sampled and displayed widths were stored width (should be
>st->codecpar->width like it is already done for height, with the
>DV50/100 exception)
The width is one thing; for whatever reason, there is a divergence between DV100 on one hand and AVCI/XDCAMHD35 on the other. In my understanding, in current practices, DV obey s337 (stored width includes scaling) but xdcam&avci does not, so current code is fine but maybe this is an opportunity to document this ?
The height is another topic, and in my information (checked against some samples from K2/Harmonic/bmx), DV height should not be rounded : maybe this patch is an opportunity to fix this ?
Note: please mind update fate (make fate-lavf-mxf_opatom GEN=1).
Nicolas
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next prev parent reply other threads:[~2023-01-16 14:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-14 15:48 Jerome Martinez
2023-01-14 20:04 ` Michael Niedermayer
2023-01-15 14:24 ` Jerome Martinez
2023-01-15 16:55 ` Michael Niedermayer
2023-01-16 13:50 ` Tomas Härdin
2023-01-16 14:28 ` Jerome Martinez
2023-01-18 10:10 ` Tomas Härdin
2023-01-16 14:00 ` Nicolas Gaullier [this message]
2023-01-16 15:49 ` Jerome Martinez
2023-01-16 18:15 ` Nicolas Gaullier
2023-03-06 17:09 ` Nicolas Gaullier
2023-03-10 21:10 ` Marton Balint
2023-03-13 22:30 ` Marton Balint
2023-03-13 22:39 ` Pierre-Anthony Lemieux
2023-03-14 9:41 ` Jerome Martinez
2023-03-26 19:32 ` Marton Balint
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