go2rtc/pkg/h264

H264

Access Unit (AU) can contain one or multiple NAL Unit:

1. [SEI,] SPS, PPS, IFrame, [IFrame...]
2. BFrame, [BFrame...]
3. IFrame, [IFrame...]

RTP H264

Camera	NALu
EZVIZ C3S	7f, 8f, 28:28:28 -> 5t, 28:28:28 -> 1t, 1t, 1t, 1t
Sonoff GK-200MP2-B	28:28:28 -> 5t, 1t, 1t, 1t
Dahua IPC-K42	7f, 8f, 28:28:28 -> 5t, 28:28:28 -> 1t, 28:28:28 -> 1t
FFmpeg copy	5t, 1t, 1t, 28:28:28 -> 1t, 28:28:28 -> 1t
FFmpeg h264	24 -> 6:5:5:5:5t, 24 -> 1:1:1:1t, 28:28:28 -> 5f, 28:28:28 -> 5f, 28:28:28 -> 5t
FFmpeg resize	6f, 28:28:28 -> 5f, 28... -> 5t, 24 -> 1:1f, 24 -> 1:1t

WebRTC

Video codec	Media string	Device
H.264/baseline!	avc1.42E0xx	Chromecast
H.264/baseline!	avc1.42E0xx	Chrome/Safari WebRTC
H.264/baseline!	avc1.42C0xx	FFmpeg ultrafast
H.264/baseline!	avc1.4240xx	Dahua H264B
H.264/baseline	avc1.4200xx	Chrome WebRTC
H.264/main!	avc1.4D40xx	Chromecast
H.264/main!	avc1.4D40xx	FFmpeg superfast main
H.264/main!	avc1.4D40xx	Dahua H264
H.264/main	avc1.4D00xx	Chrome WebRTC
H.264/high!	avc1.640Cxx	Safari WebRTC
H.264/high	avc1.6400xx	Chromecast
H.264/high	avc1.6400xx	FFmpeg superfast

Useful Links

• RTP Payload Format for H.264 Video
• The H264 Sequence parameter set
• H.264 Video Types (Microsoft)
• Automatic Generation of H.264 Parameter Sets to Recover Video File Fragments
• Chromium sources
• AVC levels
• AVC profiles table
• Supported Media for Google Cast
• Two stream formats, Annex-B, AVCC (H.264) and HVCC (H.265)