hi -
> From: [EMAIL PROTECTED]
>
> I am trying to convert some MJPEG that I captured with my G400 Marvel
> to MPEG2. I have tried an mpeg2enc coomandline sever al times but
> it's too slow. The best I can get (with bad quality switches) is
> 2fps. But at that rate every hour I record will take 15 hours to
On a ~800 MHz Pentium-3 class cpu that sounds about right. I get
somewhere between 1.5 and 2 fps with a 800MHz P3 (I guess the
Duron-800 is comparable).
> What mpeg2enc switches would yield the best speed (at the cost of
> quality of course)?
"-4" and "-2". The defaults should be ok though (which are "-4 3" and
"-2 3" as I recall). I use "-4 2" which seems to work ok.
On a ~2.2GHz P4 I get between 5 and 6 frames/sec for encoding 720x480
frames. It's actually a dual cpu system - one cpu runs the denoiser
and the other the encoder - with a buffering process between them
the denoisng is almost "free" (the system does become compute bound
on both cpus for hours at a time).
> From: Laurent Pinchart <[EMAIL PROTECTED]>
>
> I experience the same speed using a P3-800 with MMX enabled (haven't checked
> if mpeg2enc actually uses MMX, but configures reports that MMX is enabled and
> HAVE_ASM_MMX is set to 1 in config.h).
It would seem that ~1.5-2.0 fps is about what a 800MHz P3 types of
system can do. One way to speed things up somewhat is to have a
dual cpu system so that the denoising/scaling/filtering/whatever
can be done in parallel with the encoding.
One way to speed things up is to scale the data to a smaller
size - for DVDs 352x480 is legal - that should double the encoding
rate.
The other way to speed things up of course is to have a faster cpu :-)
I've read that the P4's MMX/MMX2 implementation is more efficient
than that of the P3.
Cheers,
Steven Schultz
[EMAIL PROTECTED]
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