Features: I, P Frame encoding, PMVFast and EPZS with diamond and square pattern motion estimation, inter4v mode, fullpixell and halfpixel, precision, both MPEG4 and H263 quantizations, custom quant matrices, Adaptive quantization / Luminance masking.

XviD is a continuation of Project Mayo and aims to develope a high quality open-source MPEG-4 codec.

As you may already know, XviD comes from the same open-source project that was the basis for DivX 4.x/5.x, but instead of going all commercial, XviD remains open-source. The quality of the codec is extremely good, and encoding speed is very fast as well, so it is at least worth a try.

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