#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 did the change // saved it and $ ./configure && make.
{{{
$ ./ffmpeg -f alsa -ac 2 -i hw:0,0 -y -t 120 out.wav
ffmpeg version N-54228-g42bd0cd Copyright (c) 2000-2013 the FFmpeg
developers
built on Jun 27 2013 15:15:45 with gcc 4.4.7 (GCC) 20120313 (Red Hat
4.4.7-3)
configuration:
libavutil 52. 37.101 / 52. 37.101
libavcodec 55. 17.100 / 55. 17.100
libavformat 55. 10.100 / 55. 10.100
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 77.101 / 3. 77.101
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: 1372346284.750455, 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 : Lavf55.10.100
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= 8352kB time=00:00:44.54 bitrate=1536.0kbits/s
video:0kB audio:8352kB subtitle:0 global headers:0kB muxing overhead
0.000935%
}}}
I recorded 2x 120seconds files.
First has 31 tics, second has 26 tics, this is more than previously, but
no distortion.
I did records with music and there are lot of tics, almost like a vinyl
record.
This is not linked to the output level of the player nor the input level
of the sound preference.
This looks link to the density of the sound if I cut suddenly the player,
4 or 5 tics occur in the half second after in the silence.
If you want a sample let me know.
This in not acceptable but this is not the bug I had when I open the
thread. Maybe there is 2 different bugs.
Sorry but I will have to re-start few steps back, maybe at the beginning.
Do you agree to lead me?
I hope I don't spend too much of your time.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2504#comment:103>
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