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Sur d’autres sites (3824)

  • Writing numpy arrays using cv2 VideoWriter

    8 juillet 2015, par JustInTime

    I have a problem with writing a toy example video using opencv2.3.1 VideoWriter, here is how I do it :

    writer = cv2.VideoWriter('test1.avi',cv.CV_FOURCC('P','I','M','1'),25,(640,480))
    
for i in range(1000):
    
    x = np.random.randint(10,size=(480,640)).astype('uint8')
    
    writer.write(x)
    
#del writer (with or without tested)

    I tried every possible combination resulting with a 0 bytes file if the extension was mpg, and 5.5kb if it was avi. I should say that some pointed out that I should build the ffmpeg library from source and not apt-get it. Well I did that on a fresh machine based on the help of this site http://vinayhacks.blogspot.com/2011/11/installing-opencv-231-with-ffmpeg-on-64.html. which also presented an error while compiling opencv(the error was related to ffmpeg). Now I am really out of ideas, How to generate a video using OPENCV ?

    Thanks in advance

  • Writing numpy arrays using cv2 VideoWriter

    8 juillet 2015, par JustInTime

    I have a problem with writing a toy example video using opencv2.3.1 VideoWriter, here is how I do it :

    writer = cv2.VideoWriter('test1.avi',cv.CV_FOURCC('P','I','M','1'),25,(640,480))
    
for i in range(1000):
    
    x = np.random.randint(10,size=(480,640)).astype('uint8')
    
    writer.write(x)
    
#del writer (with or without tested)

    I tried every possible combination resulting with a 0 bytes file if the extension was mpg, and 5.5kb if it was avi. I should say that some pointed out that I should build the ffmpeg library from source and not apt-get it. Well I did that on a fresh machine based on the help of this site http://vinayhacks.blogspot.com/2011/11/installing-opencv-231-with-ffmpeg-on-64.html. which also presented an error while compiling opencv(the error was related to ffmpeg). Now I am really out of ideas, How to generate a video using OPENCV ?

    Thanks in advance

  • IE11 not playing mp4 file

    11 juin 2014, par John Qualis

    I am using ffmpeg to convert a freely available public RTSP stream to a mp4 file. I can play the file quite well in Chrome using a standard HTML5 video client on a windows 7 machine but not in IE11. Any ideas why the mp4 will not play in IE11 or WMP ?

    ffmpeg -i rtsp://dmzosx001.dpa.act.gov.au/medium -acodec copy 
    
-vcodec copy -f mp4 -movflags frag_keyframe+empty_moov 
    
-min_frag_duration 1000 -reset_timestamps 1 -vsync 1 
    
-flags global_header -bsf:v dump_extra -y output.mp4

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