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

[FFmpeg]

#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 Kamedo2):

 Seeing the spectrogram, sometimes, up to 22kHz is encoded. No way we can
 hear that high. However, because of your algorithm, the cutoff seems to be
 much higher than it actually is, and the sound is much clearer in typical
 cases. But we have to be careful of exceptions. I think I feel strange
 when the encoded_highest_sound - normal_cutoff is more than 3kHz. Sounds
 something like plip, plip. Is coarse quantization at cutoff~cutoff*1.2
 applied only to transients?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:91>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker