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The pirate bay depuis la Belgique
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`ffmpeg record audio output device
11 juillet 2020, par Royi am trying to capture my pulse output device :


alsa_output.pci-0000_00_1b.0.analog-stereo.monitor


with this command :


/usr/bin/ffmpeg -f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -c:a aac -b:a 128k /roee_files/test.wav



i get this output with those warnings, and there is an audio delay :


ffmpeg version 3.4.7 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
 configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --disable-encoder=libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
 libavutil 55. 78.100 / 55. 78.100
 libavcodec 57.107.100 / 57.107.100
 libavformat 57. 83.100 / 57. 83.100
 libavdevice 57. 10.100 / 57. 10.100
 libavfilter 6.107.100 / 6.107.100
 libavresample 3. 7. 0 / 3. 7. 0
 libswscale 4. 8.100 / 4. 8.100
 libswresample 2. 9.100 / 2. 9.100
 libpostproc 54. 7.100 / 54. 7.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, pulse, from 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor':
 Duration: N/A, start: 1594460535.507972, bitrate: 1536 kb/s
 Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
File '/roee_files/test.wav' already exists. Overwrite ? [y/N] y
Stream mapping:
 Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, wav, to '/roee_files/test.wav':
 Metadata:
 ISFT : Lavf57.83.100
 Stream #0:0: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 128 kb/s
 Metadata:
 encoder : Lavc57.107.100 aac
[aac @ 0x1aec1a0] Queue input is backward in time
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 120076, current: 116419; changing to 120076. This may result in incorrect timestamps in the output file.
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 120076, current: 117443; changing to 120076. This may result in incorrect timestamps in the output file.
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 120076, current: 118467; changing to 120076. This may result in incorrect timestamps in the output file.
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 120076, current: 119491; changing to 120076. This may result in incorrect timestamps in the output file.
[aac @ 0x1aec1a0] Queue input is backward in time
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 123587, current: 118096; changing to 123587. This may result in incorrect timestamps in the output file.
[wav @ 0x1aeabc0] Non-monotonous DTS in output stream 0:0; previous: 123587, current: 119120; changing to 123587. This may result in incorrect timestamps in the output file.



but,
when i am trying to capture my pulse input device with the same command :


/usr/bin/ffmpeg -f pulse -i alsa_input.pci-0000_00_1b.0.analog-stereo -c:a aac -b:a 128k /roee_files/test.wav



everything works fine without any warning or delay as you can see in this output :


ffmpeg version 3.4.7 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
 configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --disable-encoder=libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
 libavutil 55. 78.100 / 55. 78.100
 libavcodec 57.107.100 / 57.107.100
 libavformat 57. 83.100 / 57. 83.100
 libavdevice 57. 10.100 / 57. 10.100
 libavfilter 6.107.100 / 6.107.100
 libavresample 3. 7. 0 / 3. 7. 0
 libswscale 4. 8.100 / 4. 8.100
 libswresample 2. 9.100 / 2. 9.100
 libpostproc 54. 7.100 / 54. 7.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, pulse, from 'alsa_input.pci-0000_00_1b.0.analog-stereo':
 Duration: N/A, start: 1594460998.540483, bitrate: 1536 kb/s
 Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
File '/roee_files/test.wav' already exists. Overwrite ? [y/N] y
Stream mapping:
 Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, wav, to '/roee_files/test.wav':
 Metadata:
 ISFT : Lavf57.83.100
 Stream #0:0: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 128 kb/s
 Metadata:
 encoder : Lavc57.107.100 aac
size= 822kB time=00:00:52.45 bitrate= 128.4kbits/s speed=1.07x



i tried what someone suggest here- to uncomment and change the line, default-sample-rate = 44100 , to default-sample-rate = 48000. (in /etc/pulse/daemon.conf file, and restart PA/computer) withot success.


this is my whole section in this file after changing :


; default-sample-format = s16le
 default-sample-rate = 48000
; alternate-sample-rate = 48000
; default-sample-channels = 2
; default-channel-map = front-left,front-right

; default-fragments = 4
; default-fragment-size-msec = 25

; enable-deferred-volume = yes
; deferred-volume-safety-margin-usec = 8000
; deferred-volume-extra-delay-usec = 0



Does someone can help me solve this issue PLEASE...


does it relate to sample rate, or maybe other problem ?


thank you all...!


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Signed-off-by : Michael Niedermayer <michaelni@gmx.at>