25 ms·
Keep in mind that x264's defaults have quite a few psy optimizations that dramatically decrease PSNR, since by default x264 optimizes for your eyes, not the ben
by DarkShikari 17y ago
Keep in mind that x264's defaults have quite a few psy optimizations that dramatically decrease PSNR, since by default x264 optimizes for your eyes, not the benchmarks.
This now applies somewhat to Theora as well (in current SVN); they ported over a similar optimization to x264's Variance Adaptive Quantization, which dramatically increases SSIM but lowers PSNR.
- wedesoft 17y agoI noticed too, that H.264 has some special threatment to improve encoding of uniform regions which frequently occur in artificial images. Regardless of what video codec you use, the rate-distortion greatly depends on the encoder software and how you use it. When you use MEncoder's x264-compression for example you can tell it to do multi-pass encoding, more accurate motion estimation, use less keyframes, more frames for pixel prediction, ... . Many people don't even use multipass encoding when they convert their videos. Update: Here's an interesting website about work on the theora encoder http://web.mit.edu/xiphmont/Public/theora/demo8.html http://web.mit.edu/xiphmont/Public/theora/demo8.html