[FFmpeg-devel] [PATCH v1] avformat/rtmpproto: support fourCcList property in enhanced rtmp

[Martin Storsjö]

On Wed, 23 Aug 2023, Jean-Baptiste Kempf wrote:

> Hello,
>
> On Mon, 21 Aug 2023, at 03:35, Steven Liu wrote:
>> Jean-Baptiste Kempf <jb at videolan.org> 于2023年8月20日周日 16:29写道：
>>>
>>> Hello,
>> Hi
>>>
>>> On Sun, 20 Aug 2023, at 06:10, Steven Liu wrote:
>>> > As the enhanced rtmp Extending NetConnection connect Command section
>>> > said, the rtmp should add a property named fourCcLive, but there should
>>> > only one codec can be set for the video stream in rtmp+flv, so user can
>>> > use the option rtmp_enhanced_flags to set the enhanced rtmp with av1,
>>> > hevc or vp9.
>>>
>>> Technically, the protocol allows any type of FourCC, no?
>> The protocol should allows any type of FourCC, i saw there have three
>> codecs in the example["av01", "vp09", "hvc1"].
>
> My question is then why have 0,1,2,3 and not a fourcc then? Or does this question make no sense on the protocol level?

Put another way, why map a string to a number and back to a string - why 
not just keep it a string throughout?

// Martin