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

FFmpeg trac at avcodec.org
Tue Dec 8 03:53:55 CET 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):

 Another crash example, probably another arithmetic overflow like
 comment:440. I think anything above -q:a 3 should be clipped to -q:a 3,
 because I don't think of any practical use, and to simplify the testing
 procedure.
 [[Image(http://listening-test.coresv.net/img2/noexp1.png)]]
 [[Image(http://listening-test.coresv.net/img2/noexp2.png)]]
 [[Image(http://listening-test.coresv.net/img2/noexp3.png)]]
 {{{
 ffmpeg77126 -y -i FFmpeg_anmr_error6.flac -c:a aac -q:a 1280k out.mp4
 ffmpeg version N-77126-g357c626 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. 10.100 / 55. 10.100
   libavcodec     57. 17.100 / 57. 17.100
   libavformat    57. 19.100 / 57. 19.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 20.100 /  6. 20.100
   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_error6.flac':
   Duration: 00:00:10.00, start: 0.000000, bitrate: 218 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:453>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list