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 enum AVMediaType {
   AVMEDIA_TYPE_UNKNOWN = -1,  ///< Usually treated as AVMEDIA_TYPE_DATA
   AVMEDIA_TYPE_VIDEO,
   AVMEDIA_TYPE_AUDIO,
   AVMEDIA_TYPE_DATA,          ///< Opaque data information usually continuous
   AVMEDIA_TYPE_SUBTITLE,
   AVMEDIA_TYPE_ATTACHMENT,    ///< Opaque data information usually sparse
   AVMEDIA_TYPE_NB

  enum AVCodecID {
     AV_CODEC_ID_NONE,

      /* video codecs */
     AV_CODEC_ID_MPEG1VIDEO,
     AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
     AV_CODEC_ID_H261,
     AV_CODEC_ID_H263,
     AV_CODEC_ID_RV10,
     AV_CODEC_ID_RV20,
     AV_CODEC_ID_MJPEG,
     AV_CODEC_ID_MJPEGB,
     AV_CODEC_ID_LJPEG，
     ........
  }

 4.unsigned int codec_tag; // 编码器的tag值，用于解决编码器bug