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• How can I get Python to find ffprobe ?

  4 novembre 2018, par tburrows13

  I have ffmpeg and ffprobe installed on my mac (macOS Sierra), and I have added their path to PATH. I can run them from terminal.

  I am trying to use ffprobe to get the width and height of a video file using the following code :

  import subprocess
  
  import shlex
  
  import json
  
  
  
  
  
  # function to find the resolution of the input video file
  
  def findVideoResolution(pathToInputVideo):
  
      cmd = "ffprobe -v quiet -print_format json -show_streams"
  
      args = shlex.split(cmd)
  
      args.append(pathToInputVideo)
  
      # run the ffprobe process, decode stdout into utf-8 & convert to JSON
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
      ffprobeOutput = json.loads(ffprobeOutput)
  
  
  
      # find height and width
  
      height = ffprobeOutput['streams'][0]['height']
  
      width = ffprobeOutput['streams'][0]['width']
  
  
  
      return height, width
  
  
  
  h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
  print(h, w)

  I am sorry I cannot provide a MCVE, as I didn’t write this code, and I don’t really know how it works.

  It gives the following error :

  Traceback (most recent call last):
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 21, in <module>
  
      h, w = findVideoResolution("/Users/tomburrows/Documents/qfpics/user1/order1/movie.mov")
  
    File "/Users/tomburrows/Dropbox/Moviepy Tests/get_dimensions.py", line 12, in findVideoResolution
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 626, in check_output
  
      **kwargs).stdout
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 693, in run
  
      with Popen(*popenargs, **kwargs) as process:
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
  
      restore_signals, start_new_session)
  
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe'
  
  </module>

  If python is not reading from the PATH file, how can I specify where ffprobe is ?

  Edit :
  It appears the python path is not aligned with my shell path.
  Using os.environ["PATH"]+=":/the_path/of/ffprobe/dir" at the beginning of each program allows me to use ffprobe, but why might my python path not be the same as my shell path ?

• Could not find codec parameter for webcam in ffmpeg

  2 novembre 2018, par Chris S.

  I am trying to save an image with my usb-scanner using ffmpeg and CentOS. For saving images, I am using the following command.

  ffmpeg -f video4linux2 -i /dev/video0 -vframes 1 A.jpg

  This is working for images that consists of mostly dark areas. When I take an image from a white background I always get the following error :

  [video4linux2,v4l2 @ 0x1914c00] Dequeued v4l2 buffer contains corrupted data 
  
  (0 bytes).
  
  Last message repeated 31 times
  
  [video4linux2,v4l2 @ 0x1914c00] decoding for stream 0 failed
  
  [video4linux2,v4l2 @ 0x1914c00] Could not find codec parameters for stream 0 
  
  (Video: mjpeg, none(bt470bg/unknown/unknown), 1600x1200, -5 kb/s): 
  
  unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' 
  
  options
  
  /dev/video0: could not find codec parameters

  From the —list-formats command I could archieve that my camera only supports MJPG, no YUV or anything else. My idea was to set the v4l2 settings correctly by :

  v4l2-ctl --set-fmt-video=width=1600,height=1200,pixelformat=MJPG

  But this was not helping in my case. I also though ffmpeg may have some problems with huge files, but as I found out, white images use less space than those dark ones. The scanners name is HoverCam.

  I hope someone can help me with that.

• command not working to find duration of the video file in android ?

  25 octobre 2018, par Dinesh S

  I want to find duration of the video file. For this purpose i used the below command.
  It is working file in Desktop. While running in android.It is showing error. I also attached error message . can anyone able to tell me why it is not working ?

  execFFmpegBinary("-i "+file.getAbsolutePath()+" 2>&1 | find \"Duration\"");
  
  
  
  //Function used to run command
  
  private static void execFFmpegBinary(final String command)
  
  {
  
      try
  
      {
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler()
  
          {
  
              @Override
  
              public void onFailure(String s)
  
              {
  
                  Log.d(TAG, "FAILED with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String s)
  
              {
  
                  Log.d(TAG, "SUCCESS with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onProgress(String s)
  
              {
  
                  Log.d(TAG, "Started command : ffmpeg " + command);
  
                  Log.d(TAG, "progress : " + s);
  
              }
  
  
  
              @Override
  
              public void onStart()
  
              {
  
                  Log.d(TAG, "Started command : ffmpeg " + command);
  
              }
  
  
  
              @Override
  
              public void onFinish()
  
              {
  
                  Log.d(TAG, "Finished command : ffmpeg " + command);
  
              }
  
          });
  
      }
  
      catch (FFmpegCommandAlreadyRunningException e)
  
      {
  
          // do nothing for now
  
          Log.i(TAG,"Command Already running");
  
      }
  
  }

  Error Message :

  [NULL @ 0xac11acd0] Unable to find a suitable output format for '2>&1'
  
                  2>&1: Invalid argument