[FFmpeg-trac] #7076(undetermined:new): Opus encoder hangs with some input files

[FFmpeg]

#7076: Opus encoder hangs with some input files
-------------------------------------+-------------------------------------
             Reporter:  arucard      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 = Summary of the bug =
 When I use the Opus encoder to transcode audio to Opus, it will sometimes
 end up in an infinite loop with the message `Trying to remove 960 samples,
 but the queue is empty`. The reproduction is below and the output is in
 the attached log file.

 For the reproduction I've provided an mp4 audio file though it seems that
 this could occur with any input format. It does not seem to occur with
 other output formats. I tested this with the same input file, transcoding
 to flac and vorbis, both of which succeed.

 = How to reproduce =
 {{{
 ./ffmpeg -v 9 -loglevel 99 -report -i ../hangs.mp4 -strict -2 hangs.opus
 # requires 2x Ctrl+C to kill

 ./ffmpeg -version
 ffmpeg version N-90271-g3386be16d5 Copyright (c) 2000-2018 the FFmpeg
 developers
 built with gcc 7 (Debian 7.3.0-6)
 configuration: --cc=/usr/bin/gcc-7
 libavutil      56.  8.100 / 56.  8.100
 libavcodec     58. 14.100 / 58. 14.100
 libavformat    58. 10.100 / 58. 10.100
 libavdevice    58.  2.100 / 58.  2.100
 libavfilter     7. 12.100 /  7. 12.100
 libswscale      5.  0.102 /  5.  0.102
 libswresample   3.  0.101 /  3.  0.101
 }}}
 This ffmpeg binary was built from `master` at commit
 `3386be16d5131961f73c4227e9ddde4e3a5e39e3`.

 = Additional Information =
 This seems to have been reported before for other codecs, including
 libopus. This ticket should be about the native Opus encoder in ffmpeg,
 which does not seem to be reported yet. Most of these earlier reports can
 be found with this search:
 https://trac.ffmpeg.org/search?q=+%22Trying+to+remove%22+samples+empty

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7076>
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