Some parts of a downloaded video are broken

i downloaded a video off youtube using and when I download and open the file with VLC some parts of the video is broken, as in when arriving at a certain point it freezes at the last image and plays the music from the past section but continues playing until it comes to a section where it is not broken and continues, then repeats this process over and over until almost 50% of the video is broken. I do not understand what the problem is and this has been occurring for the past two weeks...
Asked Jul 12, 2014

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