On Fri, 31 Dec 2004, Adam Gautier wrote: > > Ok, "generic MPEG-1" at a 1Mb/s rate. That does seem a bit low > > for 800x600. > > Should I raise it?
Well, consider that "VCD" resolution (352x240) typically uses about 1100 I'd think that 800x600 would need a few more bits to look good :) > > mplex -f 0 -r 1200 -o 3mintest.mpg final.m1v final.mp3 > > > I tried both 1200 and 1300 no luck... > > The bit rate for the mp3 is interesting becuase I thought it was rendered > as 256(Kbs), Thoughts? Not really ;) How was the MP3 file created (if you already mentioned that then I forgot ;)). While MPEG-1 video and "MP3" audio is an unusual combination it should work for playback on a computer. The other very interesting thing which I didn't catch at first is the "Vbv buffer size": > $ mplex -f 0 -r 1300 -o 3mintest.mpg final.m1v final.mp3 > INFO: [mplex] mplex version 1.6.2 (2.2.3 $Date: 2004/01/13 20:45:26 $) > INFO: [mplex] File final.m1v looks like an MPEG Video stream. > INFO: [mplex] File final.mp3 looks like an MPEG Audio stream. > INFO: [mplex] Found 1 audio streams and 1 video streams > INFO: [mplex] Selecting generic MPEG1 output profile > INFO: [mplex] Multiplexing video program stream! > INFO: [mplex] Scanning for header info: Video stream e0 (final.m1v) > INFO: [mplex] VIDEO STREAM: e0 > INFO: [mplex] Frame width : 800 > INFO: [mplex] Frame height : 600 > INFO: [mplex] Aspect ratio : 1:0.6735 > INFO: [mplex] Picture rate : b reserved > INFO: [mplex] Bit rate : 1000000 bits/sec > INFO: [mplex] Vbv buffer size : 1222656 bytes My goodness that's HUGE! Even HDTV (~14Mb/s) only needs 488KB but here we have a supposedly 1Mb/s stream that mplex says needs over a megabyte! Hmmm - the other very interesting thing is the "Picture rate". What kind of frame rate is "b reserved"? mplex is getting some weird (probably very high) frame rate which is confusing/breaking the other calculations that go into multiplexing a stream. It's beginning to look like the video stream is bogus somehow. I have no idea what cinelerra (sp) is doing for the encoding - but it appears to be causing a really strange stream to be output. Steven Schultz ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users