On Mon, 14 Aug 2006, David Highley wrote:
> It is puzzling that the bit rate would get so high from an analog
> 720x480 recording. I have tried to limit it with the -r option but it
> seemed to have no affect.
Why is it puzzling? Standard definition (~720x480) video is about
124 Mb/s (Megabits/second) in uncompressed form :) MPEG2 has to work
really hard to get down to less than 10Mb/s.
mpeg2enc uses "-b" for the encoding bit rate.
mplex uses "-r" BUT that will NOT change the MPEG2 file at all - so if
the file has rate spikes that prevent the file from being DVD compliant
then NO option to mplex will make the file DVD compatible.
> Given I have an mpeg2 recorded file is there away to limit the bit rate
> to record to a DVD?
That's what I was trying to get at - how was the encoding done?
You'll need to tell whatever encoder you're using not to go so high
on the bitrate if you're going to go to DVD. It sounds like whatever
is creating these files is right on the edge of being non-DVD compatible
(10% or so of the files you mentioned as having problems).
If you have an existing mpeg2 file with a rate that is too high for
DVD you will need to re-encode that - you'll need to decode the file
and then encode it with a lower bitrate.
If you're using 'mpeg2enc' to do the encoding the option is "-b" not
"-r"). And the rate control in the current (CVS) mpeg2enc has had
a lot of nice changes/improvements made recently...
Steven Schultz
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