On 26 Nov 2003, Florin Andrei wrote: > > High motion videos might benefit from '-g' being decreased - in fact > > you could set that to 1 (if you're using the cvs version of mpeg2enc > > Issues with set-top-boxes in that case?
None. Smaller GOP sizes just increase the filesize but allow the encoder to handle scene changes better. Set -g to 1 for maximum flexibility. I have a fairly complete set of test results showing the effect of '-g 1 -G N' where N was varied from 1 to 15. The effect of longer GOP sizes starts dropping a lot at around 10 or so. > > I use -4 2 -2 1. Dropping -4 from 2 to 1 increases the encoding > > time by a lot (30 - 40%) for a nominal (couple percent at best) > > ...and no visible quality gain, right? I suppose if you have golden eyeballs you might see (or imagine you see) a difference ;) > > -10 is a good non-aggressive/mild setting (i've seen good results > > with -5 to -8). > > What's the default? (the equivalent if i don't use -E at all) 0. Meaning no effect - the single coefficient logic is not invoked at all. > > 9800 is too high. Some standalone players can not handle the maximum. > > For portability you'll really want to back off to something like 8500. > > But most of the professional DVDs i've seen are at or around 9800 kb/s Not really. Or rather how are you determining that? By taking the .m2v streamsize in bytes and dividing by the playing time? If you do that you'll find it's a rare DVD that goes over 7500. I've a couple very high quality DVDs (they used a dual layer disc for a 140 minute concert) that averaged around 6000-6500 (but they did include 3 audio tracks - PCM, AC3 5.1, and DTS). It's necessary to leave room for peaks or spikes in the bitrate - exceeding the legal limit even briefly will cause playback problems Cheers, Steven Schultz ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users