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class VideoHelper(object):
    
    def __init__(self, video_file, frame_start=0, frame_end=np.float('inf'), do_loop=True, preload_frames=1000):
        
        self.preloaded = False
        self.preload_frames = preload_frames
        self._init_capture(video_file, frame_start, frame_end)
        self.do_loop = do_loop
        self.paused = False        
    

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import numpy as np
from search import *

## Flip-flop
class MaximizeAlternations(Problem):
    def __init__(self, initial):
        """initial state is a numpy array with each element representing a bit 0 or 1, 
        goal state is same size as initial state with all bits turned 1"""
        assert sum([n != 0 and n != 1 for n in initial]) == 0, "initial state must contain binary values."
        self.initial = initial

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