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Sur d’autres sites (9156)

  • Same frame multiple times when using select and vframes

    26 octobre 2023, par BlueMagma

    I'm using ffmpeg in python using the ffmpeg-python wrapper

    


    I run the following :

    


    filename = "something.mp4"
frame_number = 5 # It works fine if I ask to start at 0

out, err = (
    ffmpeg.input(filename)
    .filter_('fps', fps=10)
    .filter_('select', 'gte(n,{})'.format(frame_number))
    .output('pipe:', format='rawvideo', pix_fmt=no,uint32, vframes=5)
    .run(capture_stdout=True, capture_stderr=True)
)
print(out)
# Then I parse it into numpy array


    


    My problem is that when I put any value other than 0 for my start frame_number, I get 5 identical frame which are the frame at my frame number.

    


    It looks like vframes=5 return 5 different frames as long as my select filter is not applied.

    


    But as soon as we select frames >= N, then it returns that Nth frame 5 times

    


    What I have done wrong ?
How should I do what I'm trying to do ?

    


    EDIT :

    


    To help visualize what I mean here are a few examples :

    


    frame_number = 0, vframes=5 : [0,1,2,3,4] GOOD

    


    frame_number = 5, vframes=1 : [5] GOOD

    


    frame_number = 5, vframes=5 : [5,5,5,5,5] BAD, expected : [5,6,7,8,9]

    


  • avformat/matroskaenc : Use the correct data type for the chapter times

    17 février 2015, par Michael Niedermayer
    avformat/matroskaenc : Use the correct data type for the chapter times

    Fixes potential integer overflow
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavformat/matroskaenc.c

  • How to make a video which can play/loop infinite times using FFMPEG command in Android ?

    4 juin 2020, par Mit Shah

    Here are some details : I have a main video and I want a view (gif or video) on it which plays infinite times till video ends. Here is my current code snippet which executes successfully which plays my overlay video one time only.

    &#xA;&#xA;

    cmd = new String[]{"-y", "-i", String.valueOf(mVideoPath), "-i", tempVideoPath, "-filter_complex", overlay.toString(), "-codec:a", "copy", "-preset", "ultrafast", String.valueOf(file)};&#xA;

    &#xA;&#xA;

    Where tempVideoPath is the path of my overlay video.

    &#xA;

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