On Tue, Apr 20, 2004 at 03:07:10PM +1200, E.Chalaron wrote:
> Was wondering how I could get a MPEG2 4 DVD with a constant bit
> rate.  I do not mind about sparing DVDs, I'd rather have the best
> quality possible.

Constant bit rate does not equate to best quality.  Unless you set
the CBR ceiling high enough that the encoder never hits the ceiling,
you will have lower quality from CBR than VBR.  This is because for a
scene which consumes a lot of bits, a VBR encoder is allowed to
consume extra bits to keep the quality the same, while a CBR encoder,
if it hits the ceiling, must reduce the quality of that scene in
order to make it fit.

> Thing is DVDauthor refuses to process the output from mplex -f 3.

That's because -f 3 is not suitable for mastering to DVD's.  It is
missing data that DVDauthor uses in the mastering process.

Just use -f 8 for both, and adjust your mpeg2enc settings to get the
quality you want.  If you set a decent bit-rate ceiling (-b) and a
reasonable quantization (-q) you'll get a very high quality encoding
out of mpeg2enc.



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