[MEncoder-users] new doom9 codec comparission
dalias at aerifal.cx
Wed Dec 7 22:41:21 CET 2005
On Wed, Dec 07, 2005 at 12:22:37AM -0800, Corey Hickey wrote:
> Here is my semi-final mpeg-4 encoding line for Doom9.
> for i in 1:turbo 2 ; do
> mencoder matrix.vob -aid 128 -oac copy \
> -vf crop=718:356:0:60,scale=640:272 -sws 9 -ovc lavc \
> -lavcopts vcodec=mpeg4:vbitrate=581:mbd=2:mv0:trell:cbp:\
> last_pred=2:vqcomp=0.6:vmax_b_frames=2:vpass=$i \
> -ofps 24000/1001
> After a couple dozen full encoding tests and numerous partial ones, the
> best result I have is little different from the "Very high quality"
> suggestion in the mplayer docs. Differences are:
> ----docs --------mine---------------reason-----------
> last_pred=3 last_pred=2 slower, no difference
> vb_strategy=1 <default> lower PSNR, worse quality
> qns=2 <default> too slow for this test
qns may be slow, but it's the best perceptual-quality improvement that
doesn't show up in psnr results. you really should test and see,
because it might make all the difference!
> Unfortunately, the quality drop from using threads=2 is, in my opinion,
Definitely. I'm against using threads.
> Coming up: snow
> I've been queuing up snow tests to run in the early morning after that
> night's mpeg-4 encodes finish. I have a few more that will run tonight.
> The snow command will be like the one above, except with these differences:
> for i in 1:vqscale=2.15 2:vbitrate=581 ; do
> ...same options as above...
> -lavcopts vcodec=snow:vstrict=-2:cmp=1:subcmp=1:mbcmp=1:qpel:vpass=$i
> Some time tonight my computer will test the effect of threads=2 with and
> without last_pred=2.
I don't think snow supports threads.
More information about the MEncoder-users