RTMP: Support enhanced RTMP specification for HEVC. v6.0.42

[winlinvip]

Enhanced RTMP specification: https://github.com/veovera/enhanced-rtmp

First, start SRS v6.0.42+ with HTTP-TS support:

./objs/srs -c conf/http.ts.live.conf

Then, you can use OBS 29.1+ to push HEVC via RTMP.
Start OBS with the following settings in the Settings > Stream tab:

• Server: rtmp://localhost/live
• Stream Key: livestream
• Encoder: Please select the HEVC hardware encoder.

Finally, open the player http://localhost:8080/players/srs_player.html?stream=livestream.ts

Or use VLS or ffplay to play http://localhost:8080/live/livestream.ts

[winlinvip]

Tested OBS streaming with HEVC encoding, and played TS files using H5.

• When using hardware encoding, the video may have some shaking. Fixed by OBS 29.1 beta3.
• When playing FLV files, if playing first and then streaming, it works fine. But if streaming first and then playing, it fails. This issue is likely related to Sequence caching. Fixed by OBS 29.1 beta3.
• When using software encoding, it becomes very laggy, with noticeable stuttering.
• When using software encoding, playing works successfully initially, but subsequent attempts to play fail.
• When using software encoding, ffplay fails to play and displays the error message PPS id out of range: 0.

I checked with Junqin, and it seems that the issue with HEVC software encoding might be due to insufficient encoding performance. It works fine on his machine, so we can ignore this for now.

We need to update mpegts.js to version 1.7.3 in order to support the new specifications.

TRANS_BY_GPT3