I’ve finally documented what I know about VP4 in the wiki and I should unload it from my memory. Implementing decoders and such is left as an exercise for TrueMotion-loving reader.
Probably I’ll look at ClearVideo (for the N-th time) or some speech codec suite. Funny thing is that even if they market it as a single speech codec you have a good chance to find several codecs for different bitrates (like for Lernout & Hauspie you have CELP for 4.8 kbps and SBC with different parameters for 8, 12 and 16 kbps) and don’t get me started on VoxWare MetaSpeech (don’t confuse it with MetaSound—that one is not a speech codec or with MetaAudio—that one doesn’t exist), that’s the rant for another day.