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金山云对FFmpeg RTMP/FLV部分做了扩展，用于支持H.265。
针对《video_file_format_spec_v10_1》 VIDEODATA部分扩展如下：
The VideoTagHeader contains video-specific metadata.
| Field | Type | Comment |
|---|---|---|
| Frame Type | UB [4] | Frame Type Type of video frame. The following values are defined: 1 = key frame (for AVC and HEVC, a seekable frame) 2 = inter frame (for AVC and HEVC, a non-seekable frame) 3 = disposable inter frame (H.263 only) 4 = generated key frame (reserved for server use only) 5 = video info/command frame |
| CodecID | UB [4] | Codec Identifier. The following values are defined: 2 = Sorenson H.263 3 = Screen video 4 = On2 VP6 5 = On2 VP6 with alpha channel 6 = Screen video version 2 7 = AVC 12=HEVC |
| HVCPacketType | IF CodecID == 12 UI8 |
The following values are defined: 0 = HEVC sequence header 1 = HEVC NALU 2 = HEVC end of sequence (lower level NALU sequence ender is not required or supported |
| CompositionTime | IF CodecID==7 OR CodecID == 12 SI24 |
IF AVCPacketType == 1 OR HVCPacketType == 1 Composition time offset ELSE 0 See ISO 14496-12, 8.15.3 for an explanation of composition times. The offset in an FLV file is always in milliseconds. |
| VideoTagBody | IF FrameType == 5 UI8 ELSE ( IF CodecID == 2 H263VIDEOPACKET IF CodecID == 3 SCREENVIDEOPACKET IF CodecID == 4 VP6FLVVIDEOPACKET IF CodecID == 5 VP6FLVALPHAVIDEOPACKET IF CodecID == 6 SCREENV2VIDEOPACKET IF CodecID == 7 AVCVIDEOPACKET IF CodecID == 12 HVCVIDEOPACKET ) |
Video frame payload or frame info If FrameType == 5, instead of a video payload, the Video Data Body contains a UI8 with the following meaning: 0 = Start of client-side seeking video frame sequence 1 = End of client-side seeking video frame sequence For all but AVCVIDEOPACKET or HVCVIDEOPACKET, see the SWF File Format Specification for details |
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