On Fri, 7 Jan 2005, Steven M. Schultz wrote:
Currently, I need to run mpeg2enc 4 or even 5 times in order to find the optimal quantiser number (the -q option) that yields the best quality and uses all available bitrate. That's why I'm currently
Or simply use --cbr and let the encoder vary the -q automatically.
Last time I checked this, the encoder didn't want to use the full bitrate that it was allowed to use. The used quantiser numbers were also quite high. Transcode produced bigger output files by default, which looked more crysp also. all nicely within the specified bitrate limits. I could only persuade mpeg2enc to use the same bitrate by manually specifying the -q value that yields good results, which can only be found by trial and error. Or educated guess, but my scripts can't do that, unfortunately... :)
Maybe I did something wrong and mpeg2enc indeed works exactly as transcode does. I will check this again soon.
Specify the bitrate that will generate the desired size and the encoder will do the rest for you. Replace "-q N" with "--cbr" to use the specified bitrate, the encoder will automatically vary the effective -q for you without 4 or 5 passes. No need to use transcode (unless you want to ;)) - I didn't know it had a magic quality option <grin>
Experience should build after after a while though - shouldn't take more than 1 or 2 test encodings (representative portion of the entire video) to get the parameters "good enough".
Or just set -q down to 3 and be done with it :)
Cheers, Steven Schultz
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