On Tue, 24 Aug 2004, Anne Wilson wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Tuesday 24 Aug 2004 04:16, Selva Nair wrote: > > Hi Anne, > > > Hi, Selva > > > At last I managed to reproduce your stuttering audio on another machine > > with the latest xine (xine-lib-1-rc5, xine-ui-0.99.2). The older > > version of xine plays it fine, though. > > > Interesting. > > > After some experimentation this is what I have concluded. The audio > > stutters when the average bitrate is much below the dvd rate (see below) > > but is mplexed at the dvd rate (with -f 8). This could be something > > peculiar about this version of xine, may be not. xine-0.9.20, mplayer and > > vlc play the clip fine.
I do not understand why multiplex rate should affect playback, that's why I left it for your experimentaion instead of spamming the list with my half-baked conclusions ;) By the way, later (> 1.6.1 release?) versions of mplex can be forced to use a lower bitrate than the default of 10.08Mbps with -f 8. That may be another way to multiplex low bit-rate streams. I really do not know whether its important to keep the mplex rate not too much higher than the actual video+audio rate. Also is there a practical lower limit for dvd bitrate? > > > I've left the whole quoted, because it will be useful in the archives, I > think. This is definitely the right track. Encoding at -q 4 brought fewer > stutters, -q 3 didn't seem much better - the file size was not much bigger, > and there were still quite a few stutters. At -q the file size shot up to > around 56 MB, and the only stutters were one at the beginning, where there > was a fault in the input file, so unavoidable, and in the last 2-3 seconds. > Although it's not perfect I could live with that. Even if the issue was with the mplex rate, that much fine tuning should not be required. I never had any audio problem with mpeg2enc/mplex although I haven't used used extreme values of bit rates. Possibly something is wrong with xine too: if you run xine with --verbose you may get some messages on audio drifts, if any. Selva ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
