[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples

FFmpeg trac at avcodec.org
Sun Jun 30 23:30:29 CEST 2013


#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
             Reporter:  Kamedo2      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  aac          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by klaussfreire):

 In aacenc.c, changing

 {{{
 s->lambda *= ratio
 }}}

 by

 {{{
 s->lambda *= sqrtf(sqrtf(ratio));
 }}}

 Fixes the white nose thing, so indeed it's RC messup.

 But that brings some other trouble in more normal signals, so I guess I'll
 have to play with RC a little bit more.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:17>
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