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• Revision 34526 : - Mieux gérer l’installation en la faisant au hit suivant - Mieux ...

  17 janvier 2010, par marcimat@… — Log

   Mieux gérer l’installation en la faisant au hit suivant
   Mieux gérer les cas tordus à l’activation d’un plugin : charger systématiquement le fichier cache des fonctions de plugin charger_fonction.php pour éviter de charger le nouveau fichier contenant les nouvelles fonctions qui dépendent peut-être de fonctions déclarées dans le fichier d’option du plugin (qui n’est pas chargé à ce stade - vu que charger_options.php ne connaissait pas encore ce plugin au moment de son appel)

• Is it possible to capture audio from an ASIO device with ffmpeg ?

  26 mai 2016, par Amfasis

  We have a setup with a Windows 7 machine where we installed Dante Virtual Soundcard and start that soundcard with ASIO capabilities. The soundcard will receive audio over the network from a Tesira server. We want to capture the audio to files (highly preferring each channel to a separate file). The files will be played back on a later moment. There will likely be 6 channels or more.

  In the same setup we use ffmpeg to capture some video which is working fine, with Direct Show. So for audio we wanted to use the same setup, since ffmpeg is able to record audio as well. However, there seems to be no option to select the ASIO devices which the virtual soundcard probably creates. So the question is what command line to use for ffmpeg, or what to install ? Or which other program can record ASIO from command line ?

  I already tried installing :

  • Asio4all (actually wrong way around)
  • sox (don’t know why actually)
  • HiFi Cable Asio Bridge (from VB-audio, not enough channels even with donate version)
  • Voicemeeter (from VB-Audio, not enough channels and actually mixes down)
  • O Deus Asio link, this might be an interesting option but it did not let me configure any route, any suggestions ?

  One thing I noticed is that the virtual soundcard can also be set to use WDM. Then I can see the devices with ffmpeg -list_devices true -f dshow -i duymmy, but recording does not yield any result, I have to ctrl-c to make it stop instead of q, and the file is zero bytes. Supposedly this is because the data over the network is all ASIO formatted and the Tesira Server cannot send "WDM data". FFmpeg stops at selecting the capture pin for audio only

  EDIT :

  I ran ffmpeg with high verbosity and when selecting the WDM soundcard it stops at Selecting pin Capture on audio only. Also when requesting the options it gives the same line for 22 times : min ch=1 bits=8 rate= 11025 max ch=2 bits=16 rate= 44100

• Video delay when using filters in ffmpeg

  6 avril 2016, par Marcin

  I try to make video of sport event using raspberry pi. Drawtext filter seems good option to write score on the video.

  I have problem with synchronization / delay of video. I can see changing points few seconds before moment of score a point.

  for example, 30 seconds after start a record video I change points and wave hand to camera. I can see new text value immediately, but moment of wave hand is after at least 10 seconds.

  ffmpeg -threads 2 -f v4l2 -s 1280x720 -input_format h264 -i /dev/video0 \
  
    -filter_complex "[0:v]
  
          drawtext=reload=1:box=0:borderw=1:fontsize=36:fontcolor=White:fontfile=font/FreeSans.ttf:x=w/2-text_w/2-70:y=15:textfile=data/0.txt,
  
          drawtext=reload=1:box=0:borderw=1:fontsize=36:fontcolor=White:fontfile=font/FreeSans.ttf:x=w/2ïtext_w/2:y=15:textfile=data/1.txt" \
  
      -copyinkf -codec copy \
  
      -deinterlace -vcodec libx264 -crf 30 -pix_fmt yuv420p -preset ultrafast -qp 0 -r 30 -q 30 -minrate 800k -maxrate 800k \
  
      -tune zerolatency \
  
      -acodec aac -ab 128k -g 50 -strict experimental -f flv r.flv -y

  Another strange thing. I record video for 60 seconds and quit process by press "q" key and result video has only 42 seconds of length. Why ?

  See screen : speed of recording video ?