On Thu, 18 Mar 2004, Maarten de Boer wrote:
> If I understand you correctly, you are saying that using B frames will
> result in less player compatibility? And Richard suggests dual prima
> motion estimation is causing less player compatibility. So I guess it is
> best (compatibility wise) to both turn off B frames and turn of DPME (-R
> 0 --no-dualprime-mpeg2)? Did I understand that correctly?
I think there is a small misunderstanding ;)
Using B frames will increase player compatibility. It is the act
of NOT using B frames which begins to cause problems because some
MPEG-2 decoders do not implement part of the MPEG-2 specification
(perhaps it is an optional part? I do not not know).
For maximum compatibility, but not necessarily the highest quality,
use -R 2 and use the normal 2 B frames between P frames (or you
could use -R 1 and just use 1 B frame).
The same degree of compatibility with some of the benefits of not
using B frames is achieved by using --no-dualprime-mpeg2 with the
default -R 0.
Summary: Either use "-R 2" or "--no-dualprime-mpeg2 -R 0".
IF you know that you're not dealing with broken mpeg-2 decoders then
by all means use the default -R 0 and omit the --no-dual...
Cheers,
Steven Schultz
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