[FFmpeg-devel] 回复: 回复: [PATCH, v4] libavformat/movenc: Add support for HEVC in .3gp

[Sun Zhenliang]

In 14496-15 2019  5.4.1"AVC file type and identification"   and  8.4"HEVC video stream definition" , I think the Entry Box types 'hvc1' 'hev1',could be considered as brands of HEVC.
I just think AVC uses its Entry as major brand, maybe it works same to HEVC.

Regards,
SunZhenliang

________________________________
发件人: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> 代表 Jan Ekström <jeebjp at gmail.com>
发送时间: 2020年12月12日 01:12
收件人: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
主题: Re: [FFmpeg-devel] 回复: [PATCH, v4] libavformat/movenc: Add support for HEVC in .3gp

On Fri, Dec 11, 2020 at 3:27 PM Sun Zhenliang
<hisunzhenliang at outlook.com> wrote:
>
> I think there two files: 3GPP TS 26.244 V16.1.0 (2020-09)
> and ISO/IEC 14496-15 2019: "Information technology – Coding
> of audio-visual objects – Part 15: Carriage of NAL unit structured
> video in the ISO base media file format"  states the major brands of HEVC.
>
>
> https://www.etsi.org/deliver/etsi_ts/126200_126299/126244/16.01.00_60/ts_126244v160100p.pdf
>
> Regards,
> SunZhenliang
>

Yes, I have now found a January, 2019 draft of 14496-15 and its area
around the HEVC bits is (mostly) the same. In other words, while I can
find the reference towards AVC file format's brands, I cannot find
such for HEVC. Also if you look at the MP4 registration authority,
they actually don't have hev1 or hvc1 as registered brands. Can you
please point towards the chapter number in 14496-15 where the HEVC
brands are defined?

Jan
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