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

[FFmpeg]

#2504: Audio glitches and distortion when recording alsa
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             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           |
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Comment (by MrNice):

 I installed Ubuntu13.04 in a spare HD and I have run the basic command:

 First versions:
 !Kernel Information
 !!------------------
 Kernel release:    3.8.0-19-generic
 Operating System:  GNU/Linux
 Architecture:      x86_64
 Processor:         x86_64
 SMP Enabled:       Yes

 !!ALSA Version
 !!------------
 Driver version:     k3.8.0-19-generic
 Library version:    1.0.25
 Utilities version:  1.0.25

 Second test:
 $ ffmpeg -f alsa -ac 2 -i hw:0,0 -y out.wav
 ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav
 developers
   built on Mar 30 2013 22:20:06 with gcc 4.7.2
 *** THIS PROGRAM IS DEPRECATED ***
 This program is only provided for compatibility and will be removed in a
 future release. Please use avconv instead.
 [alsa @ 0x114ab20] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, alsa, from 'hw:0,0':
   Duration: N/A, start: 2575.326973, bitrate: N/A
     Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
 Output #0, wav, to 'out.wav':
   Metadata:
     encoder         : Lavf53.21.1
     Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0
 Press ctrl-c to stop encoding
 ^Csize=    3251kB time=17.34 bitrate=1536.0kbits/s
 video:0kB audio:3251kB global headers:0kB muxing overhead 0.001382%
 Received signal 2: terminating.

 I played with aplay and there is the distortion. Still bad.
 Does this confirm your thought?
 Alsa is now 1.0.25 instead of 1.0.22

 What I have to do now to help to fix the bug?
 Yes I need the bug to be fixed as I need to run ffmpeg to capture video
 and audio.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2504#comment:75>
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