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在ffmpeg中支持hevc/vp8/vp9/opus的flv格式

项目背景

  1. 当前阿里云，金山云等众多cdn，已经支持hevc in rtmp/flv(采用增加codecid=12的方式)
  2. 国外大厂和国外cdn支持hevc in rtmp/flv方式：enhanced-rtmp

基于兼容上面两种hevc in rtmp/flv的方式，本库均支持。

本库支持的版本(见对应的branch分支):

  • 4.1
  • 4.3
  • 5.0
  • 5.1
  • 6.0(支持enhanced-rtmp)

国内cdn方式: 新增codecid

hevc/vp8/vp9/opus在rtmp中的codecid没有官方协议定义，由国内众多知名cdn共同制定。


FLV_CODECID_OPUS = 9 << FLV_AUDIO_CODECID_OFFSET

enum {
    FLV_CODECID_H263    = 2,
    FLV_CODECID_SCREEN  = 3,
    FLV_CODECID_VP6     = 4,
    FLV_CODECID_VP6A    = 5,
    FLV_CODECID_SCREEN2 = 6,
    FLV_CODECID_H264    = 7,
    FLV_CODECID_REALH263= 8,
    FLV_CODECID_MPEG4   = 9,
    FLV_CODECID_HEVC    = 12,
    FLV_CODECID_AV1     = 13,
    FLV_CODECID_VP8     = 14,
    FLV_CODECID_VP9     = 15,
};

国外大厂和cdn方式：enhanced-rtmp

  • mux/推流：需要设置: -f flv -flvflags ext_header
ffmpeg -re -i source.flv -c:v libx265 -c:a copy -f flv -flvflags ext_header rtmp://192.168.0.1/live/1000
  • demux/拉流: 不需要格外操作，自动识别

编译

只需要把flv.h/flvdec.c/flvenc.c拷贝入libavformat文件夹中，后面ffmpeg正常编译即可。

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