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I can't skip through .MKV files

Aug 8, 2008
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I have several, high definition video files in the .mkv format. I use VLC to play them, but I can't ever skip through the video. anything over a few seconds makes the player crash. Why is this happening and what can I do to be able to skip through the video? Is it because the video is so large (they range from 4-7GB)? Is there a more stable video player? It stinks because I can't start where I left off if I close the file.

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