You probably can c2nim [ffms2](https://github.com/FFMS/ffms2). This is what 
avisynth/vapoursynth uses to store a video in a variable like in my script
    
    
    from vapoursynth import core
    video = core.ffms2.Source(source='Rule6.mkv')
    

And then it provides facility to get specific frames
    
    
    const FFMS_Frame *FFMS_GetFrame(FFMS_VideoSource *V, int n, FFMS_ErrorInfo 
*ErrorInfo);
    
    const FFMS_Frame *FFMS_GetFrameByTime(FFMS_VideoSource *V, double Time, 
FFMS_ErrorInfo *ErrorInfo);
    

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