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

FFmpeg trac at avcodec.org
Tue Oct 13 20:14:13 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):

 The combinations of these options below are now extensively tested. Rate,
 speed, and error codes are monitored.
 {{{
 ["-aac_coder faac", "-aac_coder fast", "-aac_coder twoloop"],
 ["-aac_ms 0","-aac_ms 1"],
 ["-aac_is 0","-aac_is 1"],
 ["-aac_tns 0","-aac_tns 1"],
 ["-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 44100", "-ar 48000", "-ar 96000"],
 ["-b:a 16k", "-b:a 96k", "-b:a 128k", "-q:a 1", "-b:a 240k", "-b:a 320k",
 "-b:a 512k", "-q:a 0.25"]
 }}}
 (2304 combinations total)
 {{{--aac_coder anmr}}} seems to be unstable and prone to crashing.
 {{{-aac_coder faac}}} and {{{-aac_coder fast}}} often ignore bitrate
 blatantly.

 atomnuker: Yes, I am a member of the Fueru Wakame, the audio video
 encoding community on Slack. Glad to hear that you understand Japanese to
 that point.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:431>
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