$ ls *.mpg|wc -l
124

for i in *.mpg; do ffmpeg -i "$i" 2>&1 | grep Audio ; done
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.2[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, mono, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 64 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 128 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.0[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.2[0x81]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 44100 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
  Stream #0.2[0x81]: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 96 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 448 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.2[0x81]: Audio: ac3, 48000 Hz, stereo, 224 kb/s
  Stream #0.3[0x82]: Audio: ac3, 48000 Hz, stereo, 224 kb/s