[FFmpeg-devel] [PATCH] Use LCG to generate random data for dither instead of CPU-intesive LFG.

[Michael Niedermayer]

On Mon, Apr 25, 2011 at 08:42:21PM +0200, Reimar Döffinger wrote:
> I am not able to hear any difference.
> Differences in FATE tests:
> AC3:
> stddev:    4.91 PSNR: 82.50 MAXDIFF:   55 bytes:   804864/   804864
> stddev:    0.28 PSNR:107.16 MAXDIFF:    2 bytes:  1032192/  1032192
> 
> EAC3:
> stddev:   20.26 PSNR: 70.20 MAXDIFF: 1054 bytes:   884736/   884736
> stddev:   13.27 PSNR: 73.87 MAXDIFF:  215 bytes:  2998272/  2998272
> stddev:    5.93 PSNR: 80.87 MAXDIFF:  100 bytes:   804864/   804864
> (no difference in fourth test)
> ---
>  libavcodec/ac3dec.c  |    9 +++++----
>  libavcodec/ac3dec.h  |    2 +-
>  libavcodec/eac3dec.c |    6 ++++--
>  3 files changed, 10 insertions(+), 7 deletions(-)

ok, i dont understand why an LFG was used to begin with
i also assume you didnt pick the numbers randomly but used standard
constants


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In fact, the RIAA has been known to suggest that students drop out
of college or go to community college in order to be able to afford
settlements. -- The RIAA
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