Adds HEVC (H.265), use Dynamic ID for video codecs, and auto-detect decode video codecs.

[ha-ves]

SIPSorcery supported H.265 packets via https://github.com/sipsorcery-org/sipsorcery/pull/1346

Improvements:

• [x] H.265/HEVC support with libx265,
• [x] Use dynamic RTP codecs ID counter,
• [x] Adds auto-detection of received video codec by supported formats.

(Fixed) Quirks :

• For now only direct IVideoSource.OnVideoSourceEncodedSample to IVideoSink.GotVideoFrame will work flawlessly,
• Only tested with SIPSorcery peers, (nvm, not applicable)
• only(?) I-frames (keyframes) are getting corrupted(?).

https://github.com/user-attachments/assets/5f098789-26d2-4702-9009-92af4f7ee765

https://github.com/user-attachments/assets/0858f157-43cc-48e5-9adb-077e3d3d27cd

[ha-ves]

Added some QOL improvement and bitstream filter template comment in FFmpegVideoEncoder.cs, should be OK after https://github.com/sipsorcery-org/sipsorcery/pull/1394 is merged.

@sipsorcery do you have something that I might have missed?

[sipsorcery]

@ha-ves thanks for the update. Good for merge now just needs the conflcit resolved.

[ha-ves]

Force pushing to rebase with the master branch.

[sipsorcery]

@ha-ves thanks for updating the PR. Have you been able to test H265 with Chrome, or any other browser, yet?

[ha-ves]

@sipsorcery, I added some small QoLs. I use H265 with Intel QSV wrapper, so far no glitches.

Chrome args for HEVC/H265

--enable-features=PlatformHEVCEncoderSupport,WebRtcAllowH265Receive,WebRtcAllowH265Send --force-fieldtrials=WebRTC-Video-H26xPacketBuffer/Enabled