[theora] [1.1.1] Too much quantization on flat red surfaces

qduaty at gmail.com qduaty at gmail.com
Sat Oct 24 19:56:00 PDT 2009


I've tested Theora on an HD-ready material, with quality 7, single pass.
Resulting bitrate was 1.8Mb/s. Most parts of a movie encoded this way look
fine, usually better than a DVD, and in daylight scenes, have no noticeable
artifacts at all. But it seems that red surfaces are too much compressed;
blocking artifacts are clearly visible on them. Also, white people have
slightly smeared faces, especially in scenes with low motion.

I guess I could pass a custom quantization matrix to
but I got no idea how to affect only the red plane while leaving the
of encoding as it is. So please tell me how to deal with it.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/theora/attachments/20091025/a17b8f9b/attachment.htm 

More information about the theora mailing list