[FFmpeg-cvslog] r23460 - trunk/libavcodec/vorbis_enc.c
Fri Jul 2 00:22:57 CEST 2010
On Fri, 4 Jun 2010 01:53:11 +0200 (CEST)
cehoyos <subversion at mplayerhq.hu> wrote:
> Author: cehoyos
> Date: Fri Jun 4 01:53:10 2010
> New Revision: 23460
> Raise default vorbis encoding quality.
> Patch by Frank Barchard, fbarchard google com
> - venc->quality = 1.;
> + venc->quality = 0.03;
> venc->quality *= venc->quality;
This change make all encoded samples 0 (did you test libvorbis instead?)
Or in other words: completely silent output
To raise the quality this parameter should be higher,
-aq 30.0 gives around the same output size than oggenc for the one file
I tested and definitely better quality than before this commit.
Attached patch gives about the same results than using -aq 30.0.
Why does it use 3.0 and not 30.0 ?
I am not sure what the calculation involving CODEC_FLAG_QSCALE and
FF_QP2LAMBDA really means:
But I guess a "factor to convert from H.263 QP to lambda" (from
avcodec.h) isn't related to vorbis ?
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