On Mon, 2004-05-10 at 01:31, Steven M. Schultz wrote: > Adding spatial filtering first (and 0.75 is fairly generous/high > for VHS source material) with y4mspatialfilter -L 4,0.75,3,0.75 > first followed by y4mdenoise -t 4. The command sequence becomes: > > ---------snip--------- > y4mspatialfilter -L 5,0.75,4,0.75 -C 3,0.5,3,0.5 | \
Out of curiosity, how did you settle on all these different filter lengths? You might even try running y4mspatialfilter before and after y4mdenoise in case the latter introduces any high-frequency artifacts. > Interesting that as the length of the filter increases from 1 to 3 > that the average bitrate increases gradually. Nominally, raising the "length" parameter (actually the DC group delay of an infinite-impulse response (IIR) lowpass filter) increases the amount of filtering done; but if the thresholds aren't also raised what tends to happen is that yuvdenoise throws out a lot of the filtered pixels in an attempt to avoid visible artifacts. So if you have a lot of motion or really bad noise, raising -l alone won't improve things. My "standard" set of values is "-l 1 -t 4","-l 2 -t 6", and "-l 3 -t 8" for light, medium, and heavy filtering. Dan Scholnik ------------------------------------------------------- This SF.Net email is sponsored by Sleepycat Software Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver higher performing products faster, at low TCO. http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
