On Sat, 6 Dec 2003, Andrew Stevens wrote:
> > Well, I just encoded on a couple different platforms the clip that
> > was uploaded to me and I can't seem to reproduce the artifacting.
>
> Gaahhhhh just what we need. Another Heisenbug ;-)
Yep - can't have life getting too boring can we? <grin>
> Seriously, for stuff like this you almost invariably need the *precise same*
> parameters and a similar platform as otherwise the numerics aren't identical.
Very true. I do have the precise parameters (they were in Richard's
initial posting) as well as 30s of the data, and I do have an Athlon
system. The Suse 9.0 system uses gcc 3.3.1 and Richard mentioned
his system (on which mpeg2enc was built) as having 2.95.3 - that's
a significant difference and I suspect that will perturb the
experiment.
I'll try the clip on the Athlon and see what happens but I suspect
it'll look just fine.
I did try the exact same parameters and when nothing unusual was
seen I started experimenting to see if I could cause the artifacts
to appear.
The experiment wasn't a total waste though - I managed to come up
with a proceedure that lowered the bitrate by 50% and produced
better output :)
Cheers,
Steven Schultz
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