On Tue, Dec 16, 2003 at 09:27:53AM -0800, Steven M. Schultz wrote: > > Perhaps Richard Ellis could chime in with his experiences with -Q > ;)
It seems that with the right set of options, and the right set of input data, -Q can help to create some really nasty looking artifacts. > > And again, son of.... I didn't realize the parallelization was > > done based on interlacing settings. > > Looking back on it that makes sense though. A P frame depends on > the preceeding P frame - rather sequential in nature since you > can't move on to the next one without completing the first one... The P frame dependency chain is how the artifacts come about based on Andrew's explanation. It's accumulated round off error in the iDCT routines. Made worse by -Q as well as -R 0 and a few other options. ------------------------------------------------------- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278&alloc_id=3371&op=click _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
