[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
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             Reporter:  Kamedo2      |                    Owner:
                 Type:  defect       |  klaussfreire
             Priority:  normal       |                   Status:  open
              Version:  git-master   |                Component:  avcodec
             Keywords:  aac          |               Resolution:
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by Kamedo2):

 == The results of the 96kbps listening test ==
 v9b patch beat the stable v7 patch. The quality of LAME and Nero was
 higher than the FFmpeg's native encoder.
 [[Image(http://i57.tinypic.com/11l37s2.png)]]
 == Encoders ==
 * lame 3.99.5 --abr 98
 * opusenc opus-tools-0.1.9 --bitrate 91
 * NeroAACEnc -q 0.333
 * ffmpeg_r70351_v7_patch -c:a aac -strict experimental -b:a 96k
 * ffmpeg_r70351_v9b_patch -c:a aac -strict experimental -b:a 96k
 == Used Sound Samples ==
 There were no significant differences between corpora.
 * 40 tracks from the 2014 public listening test. http://listening-
 test.coresv.net/results.htm
 * 25 tracks from my corpus. http://zak.s206.xrea.com/bitratetest/main.htm
 * 9 tracks from SoundExpert. http://soundexpert.org/sound-samples
 [[Image(http://i61.tinypic.com/30be92c.png)]]
 [[Image(http://i58.tinypic.com/2qt8w1i.png)]]

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Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:394>
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