Support for Enhanced RTMP

[Docteh]

Describe the feature

Description follows the needful

OBS 29.1 will have proper support for additional codecs in RTMP, following a recently published spec called Enhanced RTMP notably AV1, VP9, HEVC (H265?). The OBS Pull Request has more details.

Maybe its technically a bug as the README.md here mentions H265 support for OBS, but seems that was a feature/bug where OBS send HEVC over RTMP with codecid=7, which is for H.264/AVC github comment this I don't fully understand.

But I can confirm that rtmp-simple-server 0.21.6 doesn't like the nightly OBS sending H265/HEVC
2023/03/28 09:19:18 INF [RTMP] [conn 127.0.0.1:54939] closed (unsupported video codec: 0)

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