[FFmpeg-devel] [PATCH] libavformat/flvdec: add HEVC demuxing support

[Gyan Doshi]

On 2021-07-26 19:49, Steven Liu wrote:
> 在 2021年7月26日星期一，Gyan Doshi <ffmpeg at gyani.pro> 写道：
>
>>
>> On 2021-07-26 16:39, Steven Liu wrote:
>>
>>> 2021年7月26日 下午6:57，Gyan Doshi <ffmpeg at gyani.pro> 写道：
>>>> Are you referring to the choice of FLV_CODECID values?
>>>>
>>> Not only, you can find whole history on:
>>>
>>> https://lists.ffmpeg.org/pipermail/ffmpeg-devel/
>>> https://trac.ffmpeg.org/ticket/6389
>>> https://trac.ffmpeg.org/ticket/3581
>>>
>> try play this sample in ticket
>> The objections mainly center on compliance with Adobe's spec which is a
>> concern when muxing.
>>
>> no not only muxing, it’s format spec, and no documentation said which
> codec id is hevc. 10?11?12?13?14?15? How do you make sure which one is hevc
> from users flv? This is very unreasonable.

By making it a user option: ffmpeg -f flv -hevc_id 12 -i rtmp://...


>> This patch is only concerned with demuxing, so we are only talking about
>> files generated by others.
>>
>> The only technical issue is the assignment of FLV_CODECID which can be
>> mitigated by letting the user specify it at runtime. So muxers which use
>> different values can be accommodated.
>>
>> About other codecs, HW enc/dec for HEVC are widely available, not so for
>> VVC, AV1, VP? ..etc, so the slippery slope is not a concern in the near or
>> mid-term.
>   opus? HEVC is just one codec today, what about tomorrow? This is why so
> many people objection about this kind of patchset.

The slippery slope is theoretical. It will only come up when *other* FLV 
producers start muxing new codecs and *other* consumers start accepting 
such files.
Without that co-ordination and certain amount of market buy-in, this is 
not a concern.

Regards,
Gyan


>
>> Regards,
>> Gyan
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