[FFmpeg-trac] #6036(undetermined:new): sipr: improve decoding of 16khz 16kbps mode

[FFmpeg]

#6036: sipr: improve decoding of 16khz 16kbps mode
-------------------------------------+-------------------------------------
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 this bug deserves it's own ticket

 there are metalic artifacts between 21s-32s

 {{{
 C:\>ffmpeg -i sipr_16k_could_be_better.rm out.wav
 ffmpeg version 3.2.git Copyright (c) 2000-2016 the FFmpeg developers
   built with gcc 4.6.2 (GCC)
   configuration: --disable-pthreads --enable-gpl
   libavutil      55. 43.100 / 55. 43.100
   libavcodec     57. 68.100 / 57. 68.100
   libavformat    57. 61.100 / 57. 61.100
   libavdevice    57.  2.100 / 57.  2.100
   libavfilter     6. 68.100 /  6. 68.100
   libswscale      4.  3.101 /  4.  3.101
   libswresample   2.  4.100 /  2.  4.100
   libpostproc    54.  2.100 / 54.  2.100
 [rm @ 02243d60] Invalid stream index 1 for index at pos 81173
 [sipr @ 0224d380] Warning: not compiled with thread support, using thread
 emulat
 ion
 Input #0, rm, from 'sipr_16k_could_be_better.
 rm':
   Metadata:
     Generated By    : RealProducer 6.1.0.153 Windows
     Content Rating  : (PICS-1.1 "http://www.classify.org/safesurf" labels
 commen
 t "RealProducer 6.1.0.153 Windows" ratings (SS~~000 1))
     Target Audiences: 28K Modem (20 Kbps);
     Audio Format    : Voice with Background Music
     Video Quality   : No Video
     Creation Date   : 12/19/2016 3:26:44
     Modification Date: 12/19/2016 3:26:44
     File ID         : 5001d8cc-b0c8-5861-36e0-07a19838af8b
     Keywords        :
     Abstract        :
     title           : Inp
     author          :
     copyright       : ę2016
     comment         :
   Duration: 00:00:38.31, start: 0.000000, bitrate: 16 kb/s
     Stream #0:0: Audio: sipr (sipr / 0x72706973), 16000 Hz, mono, flt, 16
 kb/s
 [sipr @ 025d9c00] Warning: not compiled with thread support, using thread
 emulat
 ion
 [pcm_s16le @ 02247140] Warning: not compiled with thread support, using
 thread e
 mulation
 Output #0, wav, to 'out.wav':
   Metadata:
     Generated By    : RealProducer 6.1.0.153 Windows
     Content Rating  : (PICS-1.1 "http://www.classify.org/safesurf" labels
 commen
 t "RealProducer 6.1.0.153 Windows" ratings (SS~~000 1))
     Target Audiences: 28K Modem (20 Kbps);
     Audio Format    : Voice with Background Music
     Video Quality   : No Video
     Creation Date   : 12/19/2016 3:26:44
     Modification Date: 12/19/2016 3:26:44
     File ID         : 5001d8cc-b0c8-5861-36e0-07a19838af8b
     Keywords        :
     Abstract        :
     INAM            : Inp
     author          :
     ICOP            : ę2016
     ICMT            :
     ISFT            : Lavf57.61.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono,
 s16,
 256 kb/s
     Metadata:
       encoder         : Lavc57.68.100 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (sipr (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=    1200kB time=00:00:38.31 bitrate= 256.6kbits/s speed= 189x
 video:0kB audio:1200kB subtitle:0kB other streams:0kB global headers:0kB
 muxing
 overhead: 0.008464%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6036>
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