Quote:
Originally Posted by benwaggoner
What preset were you using? I'd expect that with weighted B and P prediction, a fade itself shouldn't require an increase in bitrate. And with Open GOP I'd hope the keyframe pop wouldn't be quite so harsh.
|
Slower , plus a few other changes . 10bit, CRF rate control
As you probably are aware, x264 and x265 have had issues with fades for a long time (probably why this option was introduced) . So I'm guessing the point of --fades was to increase the bitrate and fix the fade region (it's desired) . Without it - the banding and fade looks worse (as expected), With it, the fade looks better, bitrate increased - except for the popping
I haven't had a chance to examine in more detail or run more tests, but it's a pretty clear "pop" because of the quality change. The I frame is lower in quality. The test sequence was Lighthouses of the Pacific at the beginning . You only need to encode about 50 frames or so, it occurs 46-47 .