@XviD Developers: Bugreport...

[The People's Elbow]

Hi crazy guys, just wanted to report that the minimum keyframe interval is broken at quality based encoding...don't know if your already working on it or not, but I think it's worth mentioning, anyway!

regards,
da Elbow!

[-h]

Hi crazy guys, just wanted to report that the minimum keyframe interval is broken at quality based encoding...don't know if your already working on it or not, but I think it's worth mentioning, anyway!

It's by design - min keyframe interval is inherently a very bad thing. Forcing frames to be P-frames which would normally be I-frames, *always* decreases quality in XviD. It's just how the motion estimation sytem works.

Thus you can only set a min keyframe interval in 2-pass mode, as it aids the overflow system.

-h

[Foxer]

Originally posted by -h
It's by design - min keyframe interval is inherently a very bad thing. Forcing frames to be P-frames which would normally be I-frames, *always* decreases quality in XviD
Personally, I'd rather have a string of p-frames with the low-motion parts having more clarity to them and suffer a little more bitrate usage than have a string of i-frames.

Take a flashy scene for example or a scene with water or smoke everywhere where xvid would want to make all the frames i-frames.
Without spacing, all would be blocky but with spacing at least some things, the characters or whatever, would have more clarity to them.