Recherche avancée

Sur d’autres sites (12529)

• 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 !

• ffmpeg command problem to capture VHS video

  17 février 2019, par خوشگل چاپار

  For capturing from VHS devices by ffmpeg, I entered following command in win10 PowerShell :

  ffmpeg -f dshow -list_options true -i video="713x BDA Analog Capture"

  The result is :

  DirectShow video device options (from video devices)
  
  [dshow @ 000001e1ac6f9d80]  Pin "Capture" (alternative pin name "2")
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=yuyv422  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=yuyv422  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=uyvy422  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=uyvy422  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=rgb555le  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=bgr24  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80]   pixel_format=bgr0  min s=160x120 fps=2 max s=768x576 fps=29.97
  
  [dshow @ 000001e1ac6f9d80] Crossbar Switching Information for 713x BDA Analog Capture:
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Output pin 0: "Video Decoder" related output pin: 1 current input pin: 0 compatible input pins: 0 1 2
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Output pin 1: "Audio Decoder" related output pin: 0 current input pin: 3 compatible input pins: 3 4 5
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 0 - "Video Tuner" related input pin: 3
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 1 - "Video Composite" related input pin: 4
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 2 - "S-Video" related input pin: 5
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 3 - "Audio Tuner" related input pin: 0
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 4 - "Audio Line" related input pin: 1
  
  [dshow @ 000001e1ac6f9d80]   Crossbar Input pin 5 - "Audio Line" related input pin: 2

  My capture devise(713x BDA Analog Capture) has 3 options for input :

  • video tuner
  • composite video
  • S-video

  How can I set the "composite video" option for high quality and max resolation capture ?

• Capture desktop screens including audio with ffmpeg

  9 mars 2019, par klaus

  After referring to the official documentation and one other blog post, I now have following script :

  A="$(pacmd list-sources | grep -PB 1 "analog.*monitor>" | head -n 1 | perl -pe 's/.* //g')"
  
  F="/home/enan/Videos/$(date --iso-8601=minutes | perl -pe 's/[^0-9]+//g').mkv"
  
  V="$(xdpyinfo | grep dimensions | perl -pe 's/.* ([0-9]+x[0-9]+) .*/$1/g')"
  
  ffmpeg -video_size "$V" -framerate 25 -f x11grab -i :0.0 -f pulse -i "$A" -f pulse -i default \
  
      -filter_complex amerge -ac 1 -preset veryfast "$F"

  Basically that script results into the following command :

  ffmpeg -video_size 1366x768 -framerate 25 -f x11grab -i :0.0 -f pulse -ac 2 -i default output.mkv

  In this case, with -ac 2, the audio that gets added with the captured video is of some mic. I’m using a laptop and don’t have a mic, so I don’t exactly know which device the outside sounds get added from but it does. But no audio from the main audio that I can hear through the headphone jack doesn’t get added to the video.

  If I use -ac 1 instead, the video now gets the outside audio as well as the internal audio. That’s good. But how do I restrict the video to only add internal audio, not add audio gotten from mic or something similar.

  I don’t know if it’ll help, but adding it anyway. From man mpv :

         -ac[:stream_specifier] channels (input/output,per-stream)
  
             Set the number of audio channels. For output streams it is set by
  
             default to the number of input audio channels. For input streams this
  
             option only makes sense for audio grabbing devices and raw demuxers and
  
             is mapped to the corresponding demuxer options.