On Mon, 14 Feb 2005, Michael Hanke wrote:
> I count y4mdenoise an excellent piece of software but I thought that I make
> something wrong: On my machine (1.2GHz Athlon) I obtain a denoising rate of
> 0.3 frames/sec. (that is, 5 days for a movie) This is far too slow for
That is a little lower than I would expect but it is not completely
out of line for that machine.
PAL frams are a little larger (there are fewer of them per second
so the overall number of frames in a movie is close to the same) by
576/480 or 20%
On the Athlon-2800 I just replaced I was seeing approximately 1.5
frames/sec, sometimes more, sometimes less. The speed depends on
the source material and the threshold (-t) setting. Using 1.5 on
a Athlon-2800 as a guide I would expect about 1.5 * (1200/2800)
on a Athlon-1200 or about .63 720x480 frames/sec. For PAL a figure
around .63 * (480/576) or .5 would be about right - maybe a little
more/less.
What type of material were you using and what '-t' setting was being
used? If -t is too low then y4mdenoise works a lot harder and takes
longer - I've found for most VHS sources "-t 4" works well.
> routine purposes. Or, the other way round, even a small increase in speed
> would give a lot. Therefore my question: Does anyone has experiences with
> optimization? The optimization switches in the CVS build are rather moderate
> (-O2 -mach=athlon-tbird). Are there any experiences using other compilers
Try using "--with-extra-cflags=xxxxxx" and varying the options - I
doubt much effect will be seen (-O2 turns on almost all of the
important optimizations - maybe -O3 will help).
As the old saying goes "speed costs - how fast do you want to go?" :-)
Cheers,
Steven Schultz
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