iDCT rounding
The quantization process in modern video encoders tends to make a lot of assumptions. A common one is that of continuity and uniform step size–that, for example, if we are quantizing the value 2.5,...
View ArticleThe problems with wavelets
I have periodically noted in this blog and elsewhere various problems with wavelet compression, but many readers have requested that I write a more detailed post about it, so here it is. Wavelets have...
View ArticleVP8: a retrospective
I’ve been working the past few weeks to help finish up the ffmpeg VP8 decoder, the first community implementation of On2′s VP8 video format. Now that I’ve written a thousand or two lines of assembly...
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