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• python - tqdm progress bar on ffmpeg process with avs pipe

  9 octobre 2019, par MeSo2

  I am trying to implement a tqdm progress bar, but have no idea on how to do this when calling ffmpeg with check_output. (Most of the commands are set inside the avs file.)

  from subprocess import check_output
  
  check_output("ffmpeg -i \"temp_AVS.avs\" -c:v libx264 -b:v 25M -c:a aac 1.mp4", shell=True) 

  I cam across this Can ffmpeg show a progress bar ? but nothing hints on how to best implement it with my code.

  I also found this related post How to link the ffmpeg transcoding process information into a vb6 GUI app ?, and it look like I just need to call for the ffmpeg output. But I am note sure how to do that.

• Pipe opencv images to ffmpeg using python

  9 décembre 2015, par jlarsch

  How can I pipe openCV images to ffmpeg (running ffmpeg as a subprocess) ?
  (I am using spyder/anaconda)

  I am reading frames from a video file and do some processing on each frame.

  import cv2   
  
  cap = cv2.VideoCapture(self.avi_path)
  
  img = cap.read()
  
  gray = cv2.cvtColor(img[1], cv2.COLOR_BGR2GRAY)
  
  bgDiv=gray/vidMed #background division

  then, to pipe the processed frame to ffmpeg, I found this command in a related question :

  sys.stdout.write( bgDiv.tostring() )

  next, I am trying to run ffmpeg as a subprocess :

  cmd='ffmpeg.exe -f rawvideo -pix_fmt gray -s 2048x2048 -r 30 -i - -an -f avi -r 30 foo.avi'
  
  sp.call(cmd,shell=True)

  (this also from the mentioned post)
  However, this fills my IPython console with cryptic hieroglyphs and then crashes it. any advice ?

  ultimately, I would like to pipe out 4 streams and have ffmpeg encode those 4 streams in parallel.

• Pipe opencv images to ffmpeg using python

  16 avril 2022, par jlarsch

  How can I pipe openCV images to ffmpeg (running ffmpeg as a subprocess) ?
(I am using spyder/anaconda)

  



  I am reading frames from a video file and do some processing on each frame.

  



  import cv2   
cap = cv2.VideoCapture(self.avi_path)
img = cap.read()
gray = cv2.cvtColor(img[1], cv2.COLOR_BGR2GRAY)
bgDiv=gray/vidMed #background division


  



  then, to pipe the processed frame to ffmpeg, I found this command in a related question :

  



  sys.stdout.write( bgDiv.tostring() )


  



  next, I am trying to run ffmpeg as a subprocess :

  



  cmd='ffmpeg.exe -f rawvideo -pix_fmt gray -s 2048x2048 -r 30 -i - -an -f avi -r 30 foo.avi'
sp.call(cmd,shell=True)


  



  (this also from the mentioned post)
However, this fills my IPython console with cryptic hieroglyphs and then crashes it. any advice ?

  



  ultimately, I would like to pipe out 4 streams and have ffmpeg encode those 4 streams in parallel.