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

FFmpeg trac at avcodec.org
Sat Oct 17 17:28:49 CEST 2015


#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------

Comment (by Kamedo2):

 I am testing the combination of these options on N-76111-g8c9c8fd.
 {{{
 ["-b:a 8k", "-b:a 80k", "-b:a 160k", "-b:a 320k", "-b:a 530k", "-q:a 0.1",
 "-q:a 2", "-q:a 320k"],
 ["-profile:a aac_ltp", "-profile:a aac_main -aac_pred 1 -aac_pns 0",
 "-profile:a aac_low -aac_pns 1", "-profile:a mpeg2_aac_low"],
 ["-ar 8000", "-ar 11025", "-ar 24000", "-ar 44100", "-ar 48000", "-ar
 96000"],
 ["", "-cutoff 15000", "-cutoff 22050"]
 }}}
 Test tracks are ffmpeg_aacvbr_pulse1.flac(12.12sec),
 ffmpeg_anmr_error.flac(2.32sec), ffmpeg_96k_error.flac(2.01sec).

 {{{-profile:a aac_ltp}}} encoding is currently slower than the realtime,
 about 0.9x on 44.1kHz. Is it the intended behavior?

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:442>
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