I produce a lot of VCDs. I haven't started doing SVCDs yet, because no one I know has a DVD player that can handle them. (Gotta make what works across most peoples' equipment, right? :-)
I reduce my audio/video bitrates in order to write longer movies onto VCDs. I'll put up to 100 minutes or so onto a VCD before I get unhappy with the quality.
My formula for calculating bitrates for VCDs looks like this. Divide 144000 (the number of frames in an 80-minute NTSC video) by the number of frames in the movie. If it's less than 0.8, don't burn a 1-disc VCD. Otherwise, multiply by 1376 (i.e. the total audio/video rate of a "standard" VCD), then multiply by 0.9945 (i.e. my "fudge factor" to account for the extra space multiplexing takes). This'll give you your total bitrate. Subtract 224, 192, or 160, depending on what you want your audio bitrate to be. What's left is the video bitrate that'll fill up an 80-minute CD-R.
The formula tends to produce 359,350-sector VCDs, which means you have enough slack to round up if your total suggested video bitrate's fractional part is .5 or more.
I know your question was about SVCDs, but I hope this helps anyway. :-)
Steven Boswell, [EMAIL PROTECTED]
I have a 90 minute movie which I want to burn onto one CD which I can play on my DVD player.
lav2mpeg does a great job of creating VCD and SVCD mpeg files which are good quality, but too big. What can I tweak to get the size right down
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