[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       |  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 atomnuker):

 Replying to [comment:444 Kamedo2]:
 > {{{
 > ffmpeg76851 -y -i ffmpeg_anmr_error2.flac -c:a aac -strict experimental
 -ar 44100 -profile:a aac_ltp -b:a 80k out.mp4
 > }}}
 > still crashes the encoder.
 >
 > {{{
 > ffmpeg version N-76851-ga330430 Copyright (c) 2000-2015 the FFmpeg
 developers
 >   built with gcc 5.2.0 (GCC)
 >   configuration: --enable-gpl --enable-version3 --enable-nonfree
 --enable-libmp3
 > lame --enable-libvo-aacenc --enable-libvorbis --enable-libfdk-aac
 --enable-w32th
 > reads --extra-ldflags=-static --extra-cflags='-mtune=nocona'
 --optflags=-O2
 >   libavutil      55.  9.100 / 55.  9.100
 >   libavcodec     57. 16.100 / 57. 16.100
 >   libavformat    57. 19.100 / 57. 19.100
 >   libavdevice    57.  0.100 / 57.  0.100
 >   libavfilter     6. 15.100 /  6. 15.100
 >   libswscale      4.  0.100 /  4.  0.100
 >   libswresample   2.  0.101 /  2.  0.101
 >   libpostproc    54.  0.100 / 54.  0.100
 > Input #0, flac, from 'ffmpeg_anmr_error2.flac':
 >   Duration: 00:00:17.95, start: 0.000000, bitrate: 504 kb/s
 >     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 > Output #0, mp4, to 'out.mp4':
 >   Metadata:
 >     encoder         : Lavf57.19.100
 >     Stream #0:0: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo,
 fltp (16
 >  bit), 80 kb/s
 >     Metadata:
 >       encoder         : Lavc57.16.100 aac
 > Stream mapping:
 >   Stream #0:0 -> #0:0 (flac (native) -> aac (native))
 > Press [q] to stop, [?] for help
 > size=      38kB time=00:00:03.85 bitrate=  81.8kbits/s
 > }}}


 Just pushed a commit which improved LTP and fixes the crash. Give it a
 try. New version is N-76858-g1e5dbb3.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:446>
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