18 Nov
2014
18 Nov
'14
2:48 p.m.
On Tue, 18 Nov 2014 15:10:35 +0100
Carsten Kurz <audiovisual(a)t-online.de> wrote:
I just redid some benchmarks to find out if the new
12Bit processing
causes any performance degradation. On two machines, Mac and Windows,
1.76.12 is even slightly faster than 1.69.
Carl, is the 12Bit processing always on, or only with content >8Bit?
Hi Carsten,
Thanks very much for doing that. I've been meaning to check. 12-bit is
always on: frame images are converted from whatever to 48-bit RGB
(16:16:16) (as FFmpeg does not seem to have a 12bpp RGB type) and then
truncated to 12bpp before the gamma correction and RGB->XYZ conversion.
I'm a bit surprised there isn't a noticeable hit, but then most of the
time is spent in J2K encoding anyway.
There were a few small performance optimisations around 1.70.0 that
might be having an effect here.
Regards,
Carl