WebM VP8/Vorbis marked as such:
WebM VP8/Vorbis unmarked:
WebM VP8 (no audio) marked as such:
WebM VP8 (no audio) unmarked:
MP4 VP8 (no audio), marked as vp8 (expected to fail):
MP4 VP8 (no audio), marked as vp08:
MP4 VP8 (no audio), unmarked: