Comment 7 for bug 956830

I can reproduce 100% of the time and crossfade doesn't help. Playback sometimes continues after a while (3-4 minutes in the most recent case I saw) and the song jumps to a position close to where it would have been if it had been playing from the beginning.

The following transitions cause a pause:
  mp3->ogg
  mp3->flac
  ogg->flac
  flac->ogg

These do not:
  ogg->mp3
  flac->mp3

I don't have other media types in the library to test with.