[FFmpeg-devel] flashsvenc.c - sampling block size too low

Jason Askew jason.askew
Fri May 11 16:26:54 CEST 2007

Sampling block size in flashsvenc.c is currently set a 1x1 (or 16 x 16 pixels).

In the course of patching the file to handle negative linesizes, I ran
some testing and found that 1x1 is no where near the sweet spot.
Running a series of tests I've found that 3x3 generally gives a files
size 1/4 to 1/3 of the current settings.

Any objections on a patch to bump these values up?  Performance will
be enhanced.

Additionally, any objections to a patch to be able to pass in these params?

And, finally, two pass approach would be best to let flashsv figure
out the optimum size by itself, so I may start working on that, also,
if no objections are raised.

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