[FFmpeg-trac] #10186(undetermined:new): roq_adpcm enc: noisy mono audio

[FFmpeg]

#10186: roq_adpcm enc: noisy mono audio
-------------------------------------+-------------------------------------
             Reporter:  ami_stuff    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 https://trac.ffmpeg.org/raw-attachment/ticket/10178/16_33_M_C0.WA

 it looks like a very old regression, 1aeb88b (from 2011) is able to encode
 mono files in good audio quality

 {{{
 ./ffmpeg -i 16_33_M_C0.WA -ar 22050 -y out.roq
 ffmpeg version N-109772-gc56f5be678 Copyright (c) 2000-2023 the FFmpeg
 developers
   built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
   configuration:
   libavutil      57. 44.100 / 57. 44.100
   libavcodec     59. 63.100 / 59. 63.100
   libavformat    59. 38.100 / 59. 38.100
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 56.100 /  8. 56.100
   libswscale      6.  8.112 /  6.  8.112
   libswresample   4.  9.100 /  4.  9.100
 Input #0, wavarc, from '16_33_M_C0.WA':
   Duration: N/A, start: 0.000000, bitrate: N/A
   Stream #0:0: Audio: wavarc (0CPY / 0x59504330), 33333 Hz, mono, s16p
 Stream mapping:
   Stream #0:0 -> #0:0 (wavarc (native) -> roq_dpcm (native))
 Press [q] to stop, [?] for help
 Output #0, roq, to 'out.roq':
   Metadata:
     encoder         : Lavf59.38.100
   Stream #0:0: Audio: roq_dpcm, 22050 Hz, mono, s16, 178 kb/s
     Metadata:
       encoder         : Lavc59.63.100 roq_dpcm
 [wavarc @ 0x5582329d1700] get_buffer() failed=  -0.0kbits/s speed=N/A
 Error while decoding stream #0:0: Invalid data found when processing input
 size=     218kB time=00:00:09.96 bitrate= 178.9kbits/s speed= 478x
 video:0kB audio:218kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.003590%
 }}}

 {{{
 ./ffmpeg -i out.roq -y out.wav
 ffmpeg version N-109772-gc56f5be678 Copyright (c) 2000-2023 the FFmpeg
 developers
   built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
   configuration:
   libavutil      57. 44.100 / 57. 44.100
   libavcodec     59. 63.100 / 59. 63.100
   libavformat    59. 38.100 / 59. 38.100
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 56.100 /  8. 56.100
   libswscale      6.  8.112 /  6.  8.112
   libswresample   4.  9.100 /  4.  9.100
 [roq @ 0x5577da87b440] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, roq, from 'out.roq':
   Duration: 00:00:05.05, start: 0.000000, bitrate: 352 kb/s
   Stream #0:0: Audio: roq_dpcm, 22050 Hz, mono, s16, 352 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (roq_dpcm (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf59.38.100
   Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
     Metadata:
       encoder         : Lavc59.63.100 pcm_s16le
 Error demuxing input file 0: Input/output erroreed=N/A
 out.roq: Input/output error
 size=     431kB time=00:00:09.96 bitrate= 354.0kbits/s speed=1.32e+03x
 video:0kB audio:431kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.017687%
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10186>
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