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you must install opencv with ffmpeg my cmake list:

  Video I/O:
    DC1394 1.x:                  NO
    DC1394 2.x:                  YES (ver 2.2.4)
    FFMPEG:                      YES
      avcodec:                   YES (ver 57.89.100)
      avformat:                  YES (ver 57.71.100)
      avutil:                    YES (ver 55.58.100)
      swscale:                   YES (ver 4.6.100)
      avresample:                NO

you must install opencv with ffmpeg ffmpeg

my cmake list:

  Video I/O:
    DC1394 1.x:                  NO
    DC1394 2.x:                  YES (ver 2.2.4)
    FFMPEG:                      YES
      avcodec:                   YES (ver 57.89.100)
      avformat:                  YES (ver 57.71.100)
      avutil:                    YES (ver 55.58.100)
      swscale:                   YES (ver 4.6.100)
      avresample:                NO