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Sur d’autres sites (7776)

  • Remove frames based off an image with FFmpeg

    15 novembre 2020, par VEXED

    The Goal : Take a frame or a reference image and use that to decide what frames to keep/remove from an old screen recording (no audio).

    


    To be slightly more specific, I want to match a specific program that is being used in the screen recording. The program is always full screen and could potentially be identified just by a crop of the top left corner.

    


    The Question : What would be the best way to take an image, in particular a cropped corner of say 100px width and height, and look for the same matching corner in a video ? I would want to output those matches to a new file, that or remove the non-matching frames and create a new file with all the frames that match.

    


    What I Know : I know that duplicate frame removal is very possible, and I already use that for screen recordings.

    


    -filter:v mpdecimate, setpts=N/FRAME_RATE/TB \


    


    The above is being used in my screen recording script to remove duplicate frames.

    


    I'm also aware that you can crop using FFmpeg, but I'm not looking to have actual cropped output. I'm only looking to use a crop to find the portion that matches my reference image or reference frame.

    


    ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4


    


    The above is a basic crop.

    


    The only reference to finding frames by images is this one. It didn't do what I wanted and just produced dark and distorted output. Though I might be understanding what the aim of that post was incorrectly.

    


    Notes : Thanks in advance for any help, this frame/image matching doesn't have to be done while recording, but can be done in post.

    


  • avformat/mov_chan : never override number of channels based on chan atom

    29 janvier 2024, par Marton Balint
    avformat/mov_chan : never override number of channels based on chan atom

    The channel designation metadata should not override the number of channels.
    
Let's warn the user if it is inconsistent, and keep the channel layout
    
unspecified.
    

    Before the conversion to the channel layout API the code only set the mask, but
    
never overridden the channel count, so this restores the old behaviour.
    

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavformat/mov_chan.c

  • avformat/concatdec : fix cur_dts based duration calculation with nonzero stream start_time

    22 novembre 2018, par Marton Balint
    avformat/concatdec : fix cur_dts based duration calculation with nonzero stream start_time

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavformat/concatdec.c

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