現在利用しているフォーマット

忘れないようにここに書いておく

Input #0, mpeg, from 'test.mpg':
  Duration: 00:54:00.4, start: 0.339200, bitrate: 2460 kb/s
  Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 480x480, 6000 kb/s, 29.97 fps(r)
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 192 kb/s

Input #0, avi, from 'test.avi':
  Duration: 02:00:04.0, start: 0.000000, bitrate: 522 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 320x144, 23.98 fps(r)
  Stream #0.1: Audio: mp3, 24000 Hz, stereo, 48 kb/s