[FFmpeg-trac] #2504(undetermined:new): Audio glitches and distortion when recording and direct play

[FFmpeg]

#2504: Audio glitches and distortion when recording and direct play
-------------------------------------+-------------------------------------
             Reporter:  MrNice       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by MrNice):

 Is this version good for comparison?
 {{{
 ]$ ffmpeg -debug 1 -vn -f alsa -i hw:0,0 /Store3/Test/x_`date
 +%m%d_%H%M`.flac
 ffmpeg version 0.10.4 Copyright (c) 2000-2012 the FFmpeg developers
   built on Jul 25 2012 15:45:46 with gcc 4.4.6 20120305 (Red Hat 4.4.6-4)
   configuration: --prefix=/usr --bindir=/usr/bin
 --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg
 --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-
 cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-
 protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib
 --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio
 --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-
 libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-
 libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex
 --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264
 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc
 --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-
 debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
   libavutil      51. 35.100 / 51. 35.100
   libavcodec     53. 61.100 / 53. 61.100
   libavformat    53. 32.100 / 53. 32.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 61.100 /  2. 61.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  6.100 /  0.  6.100
   libpostproc    52.  0.100 / 52.  0.100
 [pcm_s16le @ 0x239b380] err{or,}_recognition separate: 1; 1
 [pcm_s16le @ 0x239b380] err{or,}_recognition combined: 1; 10001
 [alsa @ 0x2395000] All info found
 [alsa @ 0x2395000] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, alsa, from 'hw:0,0':
   Duration: N/A, start: 1368958115.772355, bitrate: N/A
     Stream #0:0, 1, 1/1000000: Audio: pcm_s16le, 48000 Hz, 2 channels,
 s16, 1536 kb/s
 [flac @ 0x2393120] err{or,}_recognition separate: 1; 1
 [flac @ 0x2393120] err{or,}_recognition combined: 1; 10001
 [flac @ 0x2393120]  compression: 5
 [flac @ 0x2393120]  lpc type: Levinson-Durbin recursion with Welch window
 [flac @ 0x2393120]  prediction order: 1, 8
 [flac @ 0x2393120]  order method: estimate
 [flac @ 0x2393120]  partition order: 0, 8
 [flac @ 0x2393120]  block size: 4608
 [flac @ 0x2393120]  lpc precision: 15
 [pcm_s16le @ 0x239b380] err{or,}_recognition separate: 1; 10001
 [pcm_s16le @ 0x239b380] err{or,}_recognition combined: 1; 10001
 Output #0, flac, to '/Store3/Test/x_0519_1108.flac':
   Metadata:
     encoder         : Lavf53.32.100
     Stream #0:0, 0, 1/90000: Audio: flac, 48000 Hz, 2 channels, s16, 128
 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le -> flac)
 Press [q] to stop, [?] for help
 size=    1164kB time=00:00:25.63 bitrate= 372.0kbits/s
 video:0kB audio:1156kB global headers:0kB muxing overhead 0.697357%
 }}}
 Same distortions with different codecs

 Thanks to read me, I started to lose hope as nobody seems to have this bug
 and I had no answer.
 If you need more tests just ask me.
 Many thanks again.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2504#comment:9>
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