Alex Beregszaszi wrote:
Hi,
+ FFmpeg/libavcodec: + * langrange multipliers instead qscale, improved the encoding quality alot
A lot? Any numbers on this?
This is some PR wording ;)
But Corey Hickey has posted a test about langrange vs qscale on ffmpeg-dev.
Actually, the essence of that thread was that I had no idea what I was doing, and I was hoping Michael would shed some light on the subject. :) It's evident that lmin and lmax do things differently from vqvin and vqmax, but I can't tell (without exhaustive testing) what exactly is going on. As far as quality improvements go, I can tentatively recommend mv0 and/or cbp. I can't actually notice any visual quality improvement (I'm biased and I can't make anybody around here sit still long enough for a double-blind test); however, the two new options often increase PSNR slightly, and that's probably a Good Thing. I want to test a couple more sources, and then I'll post my results on -users. -Corey