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Sur d’autres sites (9016)

  • Issue using moviepy package (Python)

    25 décembre 2023, par carm91

    I'm using ffmpeg_extract_subclip function from moviepy to process video files. However, the video cut I get is not the same length between start time and end time I set. For example, writing :

    


    from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip

clip=clip_filename
cutclip="cutvideo.avi"
ffmpeg_extract_subclip(clip_filename, 0, 10, targetname=cutclip)


    


    I get a video of length 10,03 or something like that (in terms of frame count, I get 602 frames instead of exactly 600).
Is there a way to get a more accurate output ?

    


  • ffmpeg probesize and analyzeduration flags

    7 mai 2014, par Xerphiel

    Could someone explain to me in simple terms what these flags/options do ?

    Running "ffmpeg -h full | grep probesize/analyzeduration" yields the following documentation :

    -probesize         <int>        .D.... set probing size (from 32 to INT_MAX) (default 5e+06)
    
-analyzeduration   <int>        .D.... specify how many microseconds are analyzed to probe the input (from 0 to INT_MAX) (default 5e+06)
    
</int></int>

    This is beyond my understanding, so am hoping for a simpler explanation.

    All the discussions on this subject I’ve found via googling do not describe the basic function of the options.

    Any help is appreciated.

    Thank you.

  • How do you enable "veryfast" libx264 preset from code using libavcodec ?

    3 novembre 2013, par dicroce

    I'm using libx264 via ffmpeg (in a C++ program), and I need to know how to activate the "veryfast" preset. A grep in the x264 source tree yields :

    include/x264.h:static const char * const x264_preset_names[] = "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo", 0  ;

    Which inclines me to believe that x264 itself supports this preset as opposed to just being implemented in ffmpeg as a collection of other settings. So, the question is : How do I get ffmpeg to activate the x264 "veryfast" preset ?

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