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• GoPro Max FFMPEG Undistortion [closed]

  11 juin 2024, par Echo

  I'm trying to use ffmpeg to undistort footage from a GoPro MAX. The GoPro outputs footage in the form of an LRV file, which contains both a front view and a back view (not a navigable 360 video). In other words, I'm taking one of these "180 degree" videos and undistorting it in the following manner :

  


  ffmpeg -i FILENAME.MP4 -vf lenscorrection=cx=0.5:cy=0.5:k1=-0.535:k2=0.065 NEWFILENAME.MP4

  


  Additional info that may help : Resolution is 704x704, Lens type appears to be Max SuperView

  


  These k1 and k2 values appear to work decently well for undistortion, yet they result in quite a bit of data loss on the edges. Are there more optimal values for this GoPro model ?

  


  Thanks !

  


  I've tried playing around with several k1 and k2 values, as well as those recommended for other models of GoPros, and they don't appear to work better than the current values I've achieved through experimentation. Is there a mathematical approach to this that might help ?

  


• I Need Help Making Our Driver Station Video Feed Faster [closed]

  30 mars, par Joshua Green

  I am currently using FFmpeg on a Raspberry Pi 4 Model B using an ArduCam UC-844 Rev. B as the camera. We do not need any audio and I don't care about the quality of the video. All we need is for the stream to be as fast as possible. The video from the camera is being streamed to the driver station via FFmpeg and being picked up on the driver station via FFplay. Right now we are getting a delay that we wish could go away or be significantly shortened. These are the commands we are using.

  


  


  • Raspberry Pi : ffmpeg -i /dev/video0 -c:v libx264 -crf 45 -maxrate 1M -bufsize 1.2M -preset ultrafast -tune zerolatency -filter:v fps=30 -f mpegts -omit_video_pes_length 0 udp://10.2.33.5:554

    


  


  • Driver Station : ffplay -fflags nobuffer -flags low_delay -probesize 32 -analyzeduration 0 -f mpegts -vf setpts=0 udp://10.2.33.5:554

    


  


  


• How run subprocess in Python 3 on windows for convert video ?

  31 août 2016, par Diego F. Ruiz S.

  I have a little problem, I have trying for a lot time converted a video with FFMPEG in python 3 like this :

  The model,

  class Video(models.Model):
  
     name = models.CharField(max_length=200, null=False)
  
     state = models.CharField(max_length=30, null=False)
  
     user_email = models.CharField(max_length=30, null=False)
  
     uploadDate = models.DateTimeField(null=False)
  
     message = models.CharField(max_length=200, null=False)
  
     original_video = models.FileField(upload_to='video', null=True)
  
     converted = models.BooleanField(default=False)

  And the code of converted.

  video = Video.objects.filter(id=param_id).get()
  
  pathConverted = 'C:\\Users\\diego\\Documents\\GitHub\\convertido.mp4'
  
  cmd = ['ffmpeg', '-i ', video.original_video.path, ' -b 1500k -vcodec ibx264 -g 30', pathConverted]
  
  print('Ejecutando... ', ' '.join(cmd))
  
  try:
  
      proc = subprocess.run(cmd, shell=True, check=True)
  
      proc.subprocess.wait()
  
  except subprocess.CalledProcessError as e:
  
      raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))

  The error is this.

   raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output)) RuntimeError: command '['ffmpeg', '-i ', 'C:\\Users\\diego\\Documents\\GitHub\\video1.avi', ' -b 1500k -vcodec libx264 -g 30', 'C:\\Users\\diego\\Documents\\GitHub\\convertido.mp4']' return with error (code 1): None

  And also I have tried this :

  video = Video.objects.filter(id=1).get()
  
  pathConverted = 'C:\\Users\\diego\\Documents\\GitHub\\convertido.mp4'
  
  cmd = ['ffmpeg', '-i ', video.original_video.path, ' -b 1500k -vcodec libx264 -g 30', pathConverted]
  
  print('Ejecutando... ', ' '.join(cmd))
  
  proc = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
  
  proc.subprocess.wait()

  In this case the error is :

  FileNotFoundError: [WinError 2] No such file or directory

  But when I copy the path and paste this in CMD on windows for try this converted the video. It works fine.

  Then, I am confused, I don’t understand what is the error.

  Somebody can help me please ?