my video just start n stop...but the audio plays smoothy..im using a canon HD Vixia HF10...now if i convert it to mpeg...it runs smoothly but loses it HD quality... i run on vista..new computer...dont know why
Without knowing your computer spec it is difficult to answer your question.
Many questions have been asked on this topic - use he search box on the right and search for jerky playback or chopy playback - you will find many answers on how to improve this.