VP8 is the royalty-free [possibly], open-source video codec that's part of Google's new
WebM video format. The Graphics and Media Lab at the Moscow State University conducted some tests comparing VP8 with
H.264, and the results seem to suggest that VP8 isn't as good as H.264:
“When comparing VP8 and x264, VP8... shows five to 25 [times] lower encoding speed with 20 to 30 percent lower quality at average. For example, x264 high-speed preset is faster and has higher quality than any of VP8 presets at average.”
but the VP8 developers counter that the video clips that were used for the tests were previously compressed using another codec, giving H.264 an unfair advantage.
As pointed out by other developers, H.264 and MPEG-like encoders have slight advantages in reproducing some of their own typical artifacts, which helps their objective measurement numbers but not necessarily visual quality. This is reflected by relatively better results for VP8 on the only uncompressed input sequence, ‘mobile calendar.’
TelevisionBroadcast:
Moscow Lab Compares H.264 and Google’s VP8
No comments:
Post a Comment