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• How to make FFMPEG video grayscale ?

  15 octobre 2018, par Aang

  In my program I am using the subprocess Python module in my script to call on FFMPEG to turn a sequence of images into a video (grayscale). It works and a video is created, but upon further inspection I see that the video itself has encoded the different intensities incorrectly.

  Here is my code :

                  subprocess.call(['/usr/local/bin/ffmpeg', '-framerate', \
  
                               framerate, '-f', 'image2','-pattern_type', \
  
                               'glob', '-i', self.directory + '/orbit_*.png', \
  
                               '-r', '10', '-s', '620x380', '-flags', 'gray', self.directory + 
  
                               ".avi"])

  Here is a link to the video that’s created : https://drive.google.com/open?id=0Bxt1siua2KQma0JaMVBMcE9TOEE

  If you’ll look at the scale bar on the right in the video, which normally looks like this
  in color, you’ll see that the same color shows up twice on the scale bar. I think it’s because FFMPEG is reading colors with the same intensities (for example, yellow and blue) the same way and therefore when the photo is encoded into grayscale it looks like this.

  What can I do ? Is this a matter of changing the "-flags", "gray" parameters of my subprocess call ?

• OpenCV 3 Python 3.5 Anaconda

  1er juillet 2016, par Sridhar Thiagarajan

  I have tried installing opencv 3 in anaconda virtual env.I used the following binstar package..

  conda
  
  
  
  source activate (envname)
  
  
  
  conda install -c https://conda.binstar.org/menpo opencv
  
  
  
  conda list 

  cv__version__ also gives the correct output 3.1.0

  This is my first sample code

   import numpy as np
  
   import cv2
  
  
  
  cap = cv2.VideoCapture(0)
  
  
  
    while(True):
  
  # Capture frame-by-frame
  
  ret, frame = cap.read()
  
  
  
  # Our operations on the frame come here
  
  gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
  # Display the resulting frame
  
  cv2.imshow('frame',gray)
  
  if cv2.waitKey(1) & 0xFF == ord('q'):
  
      break
  
  
  
  # When everything done, release the capture
  
   cap.release()
  
   cv2.destroyAllWindows()

  I get the following errors on run ./fp.py : line 1 : import : command not found
  ./fp.py : line 2 : import : command not found
  ./fp.py : line 4 : syntax error near unexpected token

  ('
./fp.py: line 4:

  cap = cv2.VideoCapture(0)’

  Whenever i used import video as video, i get errors saying error:video module not found.I think this has something todo with ffmpeg not being present in the binstar package i downloaded.

• FATE : Add FITS tests

  29 août 2017, par Paras Chadha

  FATE : Add FITS tests
  Signed-off-by : Paras Chadha <paraschadha18@gmail.com>
  

  • [DH] tests/Makefile
  • [DH] tests/fate/avformat.mak
  • [DH] tests/fate/demux.mak
  • [DH] tests/fate/fits.mak
  • [DH] tests/lavf-regression.sh
  • [DH] tests/ref/fate/fits-demux
  • [DH] tests/ref/fate/fitsdec-bitpix-32
  • [DH] tests/ref/fate/fitsdec-bitpix-64
  • [DH] tests/ref/fate/fitsdec-blank_bitpix32
  • [DH] tests/ref/fate/fitsdec-ext_data_min_max
  • [DH] tests/ref/fate/fitsdec-gbrap16
  • [DH] tests/ref/fate/fitsdec-gbrp
  • [DH] tests/ref/fate/fitsdec-gbrp16
  • [DH] tests/ref/fate/fitsdec-gray
  • [DH] tests/ref/fate/fitsdec-multi
  • [DH] tests/ref/fate/fitsenc-gbrap
  • [DH] tests/ref/fate/fitsenc-gbrap16be
  • [DH] tests/ref/fate/fitsenc-gbrp
  • [DH] tests/ref/fate/fitsenc-gbrp16be
  • [DH] tests/ref/fate/fitsenc-gray
  • [DH] tests/ref/fate/fitsenc-gray16be
  • [DH] tests/ref/lavf/fits