On Thu, Apr 06, 2006 at 01:39:52PM -0700, Steven M. Schultz wrote: > As an added "bonus tip" - here's quick and easy guesstimator for > bitrate calculation. Assumes 1 audio (224Kb/s) and 1 video track, > a few percent of the DVD capacity is reserved for menus, subtitles, > and other "overhead items". I'll skip the derivation but... > > For a single layer disc take divide the length (in minutes) of the > project into 560. The result will be the average video bitrate in > megabits/sec. Thus for a 120 (2hr) movie on a 4.38GB DVD-R we have > 560/120 = 4.666 megabits/sec or "-b 4666". I round up and add a little > (since I know the characteristics of the input or am using fewer motion > menus, or a lower audio rate) and thus "-b 4800" or 4900 would be a > very good guesstimate or starting point. > > Of course that's not a hard&fast rule but it is a good starting point > and has proven to be fairly accurate or close to filling the disc. > > For dual layer projects use 1012 instead of 560 (double layer media > is NOT 2x the capacity since the 2nd layer is lesser capacity).
Steven, When you've determined the bitrate, how do you choose the value for -q ? Nicolas. -- -------- Conti ---------------- O -- Kawasaki-Nikon-Linux --- ._ /\_> ------- Powered ----------- (x)> (x) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
