Quote:
Originally Posted by a5180007
Hi Tom, I sure will do when you say psy-rd is ready for testing. But the source is so grainy I'm not convinced psy-rd will bring any benefit at such compression. At least in x264 it does not : it removes a lot of details to put back grain noise. And before testing psy-rd, I wanted to make sure standard SAD rdo was as good as x264 in grain and detail retention.
Are the algorithms for placing I-frames so different in x264 and x265? Why would x265 put one third less I-frames with both scenecuts at 40%? This biases comparison.
EDIT : and it makes single frame comparison with x264 even more pointless.
EDIT 2 : Got it. x264 and x265 --bframes 3 --b-adapt 1 return the same amount of I-frames. Placement and numbers of P and B frames are still totally different though.
|
The lookahead cost function in x265 is different than x264. x265 evaluates more intra modes and some changes in bidir modes (as compared to x264). This makes the slice decisions different. You could use --b-adapt 0 if you need all slice decisions same across x265 and x264.