[MEncoder-users] using acidrip+mencoder to rip dvd

[RC]

On Thu, 26 May 2005 11:38:08 +0200
Guillaume POIRIER <poirierg at gmail.com> wrote:


> Could you maybe post some benchmarks to have an idea of is impact on
> both speed (does it slow down encoding,

The speed difference is nominal, so I can't accurately measure it.
Let's just say it might make a 0.5% difference, if anything. 


> and quality (PSNR and maybe also perceived quality)?

nr=0 699.391 kbit/s PSNR: Y:39.05, Cb:46.37, Cr:46.44, All:40.43

nr=100 699.374 kbit/s PSNR: Y:39.12, Cb:46.45, Cr:46.53, All:40.50

nr=500 699.093 kbit/s PSNR: Y:39.27, Cb:46.65, Cr:46.73, All:40.65

nr=1000 698.531 kbit/s PSNR: Y:39.19, Cb:46.75, Cr:46.83, All:40.59

nr=1500 698.224 kbit/s PSNR: Y:38.94, Cb:46.75, Cr:46.82, All:40.36

nr=2000 697.696 kbit/s PSNR: Y:38.61, Cb:46.71, Cr:46.75, All:40.05

nr=3000 697.900 kbit/s PSNR: Y:37.91, Cb:46.53, Cr:46.55, All:39.38


Perception matches the PNSR, despite the ratecontrol problems... nr=500
helps significantly.  When you go above ~1000 the details and colors
start to blur, solid colors start to band, and you start to see
blockiness. The artifacts are fairly obvious at values of ~2000 (unless
your source was REALLY noisy).


I encoded from a 720x480 DVD video in 3 passes with a command like this:

mencoder -nosound -quiet -vf ivtc,kerndeint,softskip -ofps 24000/1001 -
lavcopts nr=???:vbitrate=700:vpass=???:mbd=2:trell:psnr -endpos 5:00