Author of the fix is ronald, the enabling & commit message are mine.
This fixes
commit 4e3e333a79
Author: Ronald S. Bultje <rsbultje@gmail.com>
Date: Tue Jul 5 12:49:11 2011 -0700
swscale: error dithering for 16/9/10-bit to 8-bit.
Based on a somewhat similar idea in FFmpeg's swscale copy.
The Fix was originally commited in: (and i missed it due to the commit message)
commit 5c391a161a
Author: Ronald S. Bultje <rsbultje@gmail.com>
Date: Fri Jul 8 14:39:04 2011 -0700
swscale: rename uv_off/uv_off2 to uv_off_px/byte.
27bf599350