[Ffmpeg-cvslog] CVS: ffmpeg/libavcodec dsputil.c, 1.123, 1.124 dsputil.h, 1.117, 1.118 h264.c, 1.136, 1.137

Måns Rullgård mru
Sat Jun 18 12:01:19 CEST 2005

Loren Merritt <lorenm at u.washington.edu> writes:

> On Sat, 18 Jun 2005, [iso-8859-1] M?ns Rullg?rd wrote:
>> I've made some progress, but it still doesn't look quite right.
>> Could you take a look at the pictures in
>> http://inprovide.com/~mru/h264_scaling/, and see if you have any idea
>> what the problem might be?
> No clue.

Well, I have one.  I think the DC coefficients are being scaled
incorrectly.  Notice the too light/dark 16x16 blocks that appear.  I
found a few uses of dequant_coeffs that I missed the first time
around, and also read the standard a bit more carefully.  It's a bit
of a pain sometimes to figure out which part of the code maps to
various parts of the standard, the latter not exactly being optimized
the way the code is.

M?ns Rullg?rd
mru at inprovide.com

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