Video glitchy pauses jumps and stutters

Hi there
I seem to be having prolems with video playback on my MBP.
Often on You Tube for example after the video is fully downloaded on playback the video sporadically pauses or jumps forward or behaves generally glitchy. I do not believe it to be the internet connection. I have experienced some problems with downloaded files. I am fully updated as well.
Does anyone have any suggestions please for things to look at or tests to run?
Video is not my forte... :P
Thanks very much
A

Fixed. There was 5 sec video clip that plays before the main video in the track. However, the 5 sec clip was video only, not audio, and was as a .mov as opposed to mpeg2. Anyways I encoded the 5sec clip in mpeg2/AAC and added it before the main clips and everything works. Still don't know WHY it happened and why it stuttered, any ideas? Don't think it was the lack of black at the start as i didn't add any.

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Video glitchy pauses jumps and stutters

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