Indeo 3 encoder: done

After fixing some bugs I think my encoder requires no further improvement (there are still things left out there to improve but they are not necessary). The only annoying problem is that decoding some videos with the original VfW binary gives artefacts. Looks like this happens because of its peculiar way to generate and then handle codebooks: corrector pairs and quads are stored as single 32-bit word and its top bit is also used to signal if it’s a dyad or a quad. And looks like for some values (I suspect that for large negative ones) the system does not work so great so while e.g. XAnim module does what is expected, here it mistakes a result for another corrector type and decodes the following bytestream in a wrong way. Of course I’m not going to deal with that annoyance and I doubt anybody will care.

Also I’ve pruned one stupid bug from my MS Video 1 encoder so it should be done as well. The third one, Cinepak, is in laughable state (well, it encodes data but it does not do that correctly let alone effectively); hopefully I’ll work on it later.

For now, as I see no interesting formats to support (suggestions are always welcome BTW), I’ll keep writing toy encoders that nobody will use (and hopefully return to improving Cinepak encoder eventually).

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