[FFmpeg-trac] #2504(avdevice:new): Audio glitches and distortion when recording alsa

FFmpeg trac at avcodec.org
Tue Jun 11 16:50:16 CEST 2013


#2504: Audio glitches and distortion when recording alsa
------------------------------------+------------------------------------
             Reporter:  MrNice      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  important   |                Component:  avdevice
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------

Comment (by MrNice):

 Rebuitd done.
 Test:
 {{{
 $ ffmpeg -f alsa -ac 2 -i hw:0,0 -y out.wav
 bash: ffmpeg: command not found
 [jp at loja ffmpeg]$ ./ffmpeg -f alsa -ac 2 -i hw:0,0 -y out.wav
 ffmpeg version N-53955-gd3e89f2 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 11 2013 15:29:15 with gcc 4.4.7 (GCC) 20120313 (Red Hat
 4.4.7-3)
   configuration:
   libavutil      52. 35.100 / 52. 35.100
   libavcodec     55. 15.100 / 55. 15.100
   libavformat    55.  8.102 / 55.  8.102
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 75.101 /  3. 75.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
 Guessed Channel Layout for  Input Stream #0.0 : stereo
 Input #0, alsa, from 'hw:0,0':
   Duration: N/A, start: 1370961028.761392, bitrate: 1536 kb/s
     Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf55.8.102
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
 stereo, s16, 1536 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le -> pcm_s16le)
 Press [q] to stop, [?] for help
 size=    6368kB time=00:00:33.96 bitrate=1536.0kbits/s
 video:0kB audio:6368kB subtitle:0 global headers:0kB muxing overhead
 0.001227%
 }}}
 Quality is better but sound have what I call "tics" after some "bips". See
 comments 66/67
 [https://ffmpeg.org/trac/ffmpeg/ticket/2504#comment:66]

 I tried again with arecord -N -f cd -t wav out.wav: This is perfect, no
 "tic" at all. Do it use different driver?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2504#comment:86>
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