Steven M. Schultz wrote:
As I wrote in another thread: I have a still example, I think, for that problem: http://www.boerkel.de/q.zip
Initially, to me, that just looks like a variation on the grey blocks/splotches that always seem appear during dark scenes. I wonder if a bit of medianfiltering, perhaps on the chroma only, would reduce the visibility of the discoloration.
I tried some filtering with no success.
Problem is in the upper left corner. Most noticable in the q3 picture.
What type of system (cpu) is being used? SSE, MMX, MMX-Extended, ???
P3-866. Don't know exactly, what type of extra instructions this one has.
If the problem disappears at higher -q values (or does not happen with
all source material) then my theory is that there is an overflow condition in the internal arithmetic caused by specifying too low of
a -q value.
This is what I see:
At -q 4, everything is OK. With -q 3 or better, I get pulsating (every second or so) blocking (very small blocks, mosaic-like effect) in the background. If I don't use -R 2, some of those small blocks get really big and hatched, like it can be seen in the q3 example. Those examples were made without -R 2.
Of course that is making the assumption it's the same problem.
Then too it is possible it is similar but not the same thing.
I can't tell.
Thomas
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