On Wed, 17 Mar 2004, Richard Ellis wrote:
> > --no-dualprime-mpeg2
> > I suppose?
>
> Sounds right.
That option is needed if you're producing content that will be
played using either Ogle or Apple's MPEG-2 decoder - neither of
those implement Dual Prime.
> Both achieve turning off DPME, but in two different ways. The mpeg
> encoding spec that mpeg2enc follows excludes use of DPME if B frames
> are being encoded. So encoding B frames implicitly also turns off DPME.
True, mpeg2enc is a MP (Main Profile) encoder. Moving up to HP
(High Profile) does allow the use of DP with B frames. Not sure HP
content can be used with DVDs though so when mpeg2enc sprouts [EMAIL PROTECTED]
capabilities there'll no doubt be checks for invalid combinations of
options.
> The special switch provides a way to disable DPME, while still
> allowing you to encode without B frames.
That works quite well, you get the most of the benefits of skipping
B frames (faster encoding, lower average bitrate, etc).
> --no-dualprime-mpeg2. And there may be differences in the resultant
> file sizes as well.
The differences are very small - most of the savings have already
been achieved by not using B frames. I'll have to run a couple
tests again to see the difference but I don't recall it being
signficant.
Cheers,
Steven Schultz
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