On Sun, Sep 21, 2003 at 05:51:19PM -0700, Steven M. Schultz wrote: > > On Sun, 21 Sep 2003, Richard Ellis wrote: > > > The only difference between these files was different -N values. > > All other denoise/mpeg2enc parameters were identical. > > What value are you using for -q? What I am finding is that the > effect of -N changes as -q is varied - especially for the lower > values of -N
For the numbers I posted, the q value was 7. It is interesting that -N would have differing effects depending on the -q value. That may depend on how/where -N is applied within the encoder. If it's applied after -q has had it's effect, then that might explain why changing -q changes -N's effect. > ... However, the machines are running different operating systems > and the average bitrate numbers for identical runs come out > different - they are not comparable if mpeg2enc was run on > different OSs! In one case (-q 7 -N 0.5) the BSD system came out > about 6% lower than the otherwise identical run on a SuSE 8.2 > system. That is interesting. All the encodes I ran were run on a Linux system with kernel version 2.4.19. It's a P4 celeron and mpeg2enc reports that it's using the MMX and SSE extensions that are available for a P4. Are all the MMX/SSE optimizations the same for both copies of mpeg2enc? If not, that would imply that the optimizations aren't all producing the same output from the same input. ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
