Re:Follow-up on Microsoft's H.264 choice for IE9
by ZeroGravitas on Monday May 03, 2010 @03:06PM
(#1315735)
Here's a comment about that comparison from an x264 dev:
"We talked about that on IRC, both with x264 and Theora people: all considered it one of the worst articles they had ever seen.
They screwed up aspect ratio, luma levels, BT.601 vs BT.709, and so many other things in their comparison that you might as well throw the entire thing out. Plus they used an incredibly bad H.264 encoder. It’s practically a checklist of how to be completely incompetent idiots."
You couldn't have picked a worse test, out of the many that have been done over the last year or so.
The fundamental mistake he's made (though there's a whole catalog of them) is that the bitrate for Theora is constant, while the H.264 is variable so H.264 saves up bits from the easy parts for the hard parts while Theora is set up as if it was live streaming and so it just uses the same bandwidth for both the easy and hard bits.
The original article that the two clips are from is here, you can see responses from Xiph and others pointing out what he's doing wrong, though it reads strangely as he had to rewrite it twice due to feedback before he gave up:
"We talked about that on IRC, both with x264 and Theora people: all considered it one of the worst articles they had ever seen.
They screwed up aspect ratio, luma levels, BT.601 vs BT.709, and so many other things in their comparison that you might as well throw the entire thing out. Plus they used an incredibly bad H.264 encoder. It’s practically a checklist of how to be completely incompetent idiots."
http://x264dev.multimedia.cx/?p=292#comment-2768
You couldn't have picked a worse test, out of the many that have been done over the last year or so.
The fundamental mistake he's made (though there's a whole catalog of them) is that the bitrate for Theora is constant, while the H.264 is variable so H.264 saves up bits from the easy parts for the hard parts while Theora is set up as if it was live streaming and so it just uses the same bandwidth for both the easy and hard bits.
The original article that the two clips are from is here, you can see responses from Xiph and others pointing out what he's doing wrong, though it reads strangely as he had to rewrite it twice due to feedback before he gave up:
http://www.streaminglearningcenter.com/articles/ogg-vs-h264-...