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• Use Windows ffmpeg to record audio output without using the StereoMix

  5 janvier 2019, par DevtelSoftware

  I am looking for a way to record the audio output (speakers) using Windows ffmpeg.
  I need to do this WITHOUT installing any extra dshow filters and without having the StereoMix input enabled (since this is not available on many computers).

  I have read in the ffmpeg documentation that the -map would allow redirecting an audio output so that ffmpeg sees it as an audio input but I can’t find any example of how to do that.

  In Linux I managed to do it like this :

  ffmpeg -f pulse -ac 2 -ar 44100 -i alsa_output.pci-0000_00_1f.4.analog-stereo.monitor -f pulse -ac 2 -ar 44100 -i alsa_input.pci-0000_00_1f.4.analog-stereo -filter_complex amix=inputs=2 test.mp4

  However I can’t find a similar way to do it in Windows and MacOSX.

  So in short, is it possible with the Windows ffmpeg to record audio from the speakers without extra dshow filters (out-of-the-box) ? Same question goes for MacOSX.

  Thanks !

• Use Windows ffmpeg to record audio output without using the StereoMix

  2 septembre 2016, par DevtelSoftware

  I am looking for a way to record the audio output (speakers) using Windows ffmpeg.
  I need to do this WITHOUT installing any extra dshow filters and without having the StereoMix input enabled (since this is not available on many computers).

  I have read in the ffmpeg documentation that the -map would allow redirecting an audio output so that ffmpeg sees it as an audio input but I can’t find any example of how to do that.

  In Linux I managed to do it like this :

  ffmpeg -f pulse -ac 2 -ar 44100 -i alsa_output.pci-0000_00_1f.4.analog-stereo.monitor -f pulse -ac 2 -ar 44100 -i alsa_input.pci-0000_00_1f.4.analog-stereo -filter_complex amix=inputs=2 test.mp4

  However I can’t find a similar way to do it in Windows and MacOSX.

  So in short, is it possible with the Windows ffmpeg to record audio from the speakers without extra dshow filters (out-of-the-box) ? Same question goes for MacOSX.

  Thanks !

• ffmpeg screen, audio und mike recording

  6 mai 2022, par DRRDietrich

  So far I've been working with SimpleScreenRecorder to record screen and system sound. But now I also need the audio track from the microphone, which doesn't work reliably with SimpleScreenRecorder. So I tried ffmpeg, which worked right away. However, there still seems to be a problem with the time synchronization of the tracks, which probably causes the first few seconds of my recording to be broken.

  


  I get the following message :

  


  


  Queue input is backward in time

  


  Non-monotonous DTS in output stream 0:1 ; previous : X, current : Y ; changing to X. This may result in incorrect timestamps in the output file.

  


  


  That's the command I'm using. I would prefer an output with two separate audio tracks, but this solution is okay too.

  


  ffmpeg  -video_size 1920x1080 -framerate 25 \
        -thread_queue_size 1024 \
        -f x11grab -i :0.0+0,0 \
        -f pulse -ac 1 -i ${SYSTEMSOUND} \
        -f pulse -ac 1 -i ${MICROPHONE} \
        -filter_complex "[1:a][2:a]amix[a]" \
        -map 0:v -map "[a]" \
        ${OUT}.mkv


  


  How can I improve the script ?
The option -thread_queue_size 1024 was already helpful, although I'm not entirely sure what it exactly does.