[MPlayer-users] low bitrate/high quantizers can give good result with lavc (?)

HR haavroed at online.no
Wed Sep 24 10:46:14 CEST 2003


I just encoded a movie, and after the first pass, my script reported

09/23/2003 22:13:41  mencoder movie.vob -chapter 1- -oac copy -ovc lavc
-lavcopts
vcodec=mpeg4:keyint=125:vbitrate=949:mbd=2:v4mv:precmp=2:cmp=2:subcmp=2:
vpass=1 -sws 2 -vop scale=640:272,crop=712:416:6:80 -o /dev/null
09/24/2003 02:29:16  1st pass complete, listing quantizer distribution
09/24/2003 02:29:18  q1 3.7%
09/24/2003 02:29:18  q2 5.5%
09/24/2003 02:29:18  q3 24.5%
09/24/2003 02:29:19  q4 23.2%
09/24/2003 02:29:19  q5 18.0%
09/24/2003 02:29:19  q6 10.9%
09/24/2003 02:29:19  q7 6.3%
09/24/2003 02:29:20  q8 4.5%
09/24/2003 02:29:20  q9 3.1%
09/24/2003 02:29:20  q10 1.5%
09/24/2003 02:29:20  q11 0.7%
09/24/2003 02:29:21  q12 0.4%
09/24/2003 02:29:21  q13 0.2%
09/24/2003 02:29:21  q14 0.2%
09/24/2003 02:29:21  q15 0.2%

To my slight surprise, the result looks pretty good, even at this
relatively low bitrate and the reported quantizer distribution. A little
bit of ringing, and I have to scale it up to make it significantly
annoying. I think the only option to improve this result is to increase
the bitrate, since I'm already downscaled to 640:272. Right?

HR



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