From the first page of the faq:
Quote:
10. Is YV12 & AVISynth 2.5 just for Xvid/DivX or can it be used for conversions to MPEG1 or MPEG2 (DVD to (S)VCD) via TMPGenc or CCE? Or do these 2 encoders not support YV12?
Neither CCE nor TMPGEnc can use YV12 input since Windows has no internal YV12 compressor. This only means that the last line of AviSynth must be a ConvertToYUY2 (for CCE, or ConvertToRGB24 for TMPGEnc) call, and that you will not be able to take full advantage of YV12 colorspace. All internal filtering in AviSynth will be faster though (less data to filter, better structure to filter, and a very fast conversion from YV12 to YUY2), and you will definitely be able to tell the difference between 2.06 and 2.5.
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If you are making a progressive clip then there is probably more than just a speed advantage.
Putting off the YV12->YUY2 conversion until the end of the script allows you to first IVTC or Deinterlece to create progressive frames. But the YV12->YUY2 conversion for progressive frames maintains more chroma detail than it does for interlaced or field based frames.
So there should also be a small quality advantage.
- Tom