[FFmpeg-trac] #8132(undetermined:new): Audio cutoff when using nobuffer flag

FFmpeg trac at avcodec.org
Thu Sep 12 11:43:11 EEST 2019

#8132: Audio cutoff when using nobuffer flag
             Reporter:  paco         |                     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 converting audio and using the `nobuffer` flag, audio is cut off at
 the beginning, ~2 sec of a 4 sec audio.

 Audio used in the example below is available here:

 How to reproduce:
 % ffmpeg -y -fflags nobuffer -i ./coming_to_take.wav -f_err_detect
 compliant -f wav -ar 16000 -acodec pcm_s16le -ac 1

 fmpeg version: 4.1.3
 built on: Apple LLVM version 10.0.1 (clang-1001.0.46.4)

 ffmpeg output:
 Guessed Channel Layout for Input Stream #0.0 : mono
 Input #0, wav, from './coming_to_take.wav':
   Duration: 00:00:04.33, bitrate: 88 kb/s
     Stream #0:0: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 11025 Hz, mono,
 u8, 88 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_u8 (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, wav, to 'coming_to_take_converted.wav':
     ISFT            : Lavf58.20.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono,
 s16, 256 kb/s
       encoder         : Lavc58.35.100 pcm_s16le
 size=      77kB time=00:00:04.32 bitrate= 146.3kbits/s speed= 602x
 video:0kB audio:77kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.098594%
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

Ticket URL: <https://trac.ffmpeg.org/ticket/8132>
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