[Mplayer-cvslog] CVS: main ChangeLog,1.68,1.69

[Corey Hickey]

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