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

[Steven Liu <lingjiujianke@gmail.com>]

Marton Balint <cus@passwd.hu> 于2023年8月24日周四 01:43写道：
>
>
>
> On Wed, 23 Aug 2023, Martin Storsjö wrote:
>
> > 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@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?
>
> Agreed. Plus it is actually list, so you eventually you might want to
> support multiple fourcc-s by splitting the fourcc list. And the
> type is a strict array, so simply putting a string wihtout array length
> seems suspicious anyway.

new version patchset is comming:
https://lists.ffmpeg.org/pipermail/ffmpeg-devel/2023-August/313444.html

>
> Regards,
> Marton
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