Quicktime not playing full movie

Thanks in advance for responding. About half of the movies I download Quicktime will only play less than a minute of even though they are 15 minutes long. Any suggestions?

The usual cause of this symptom is that someone has merged a number of mpeg files incorrectly and QT is not recognizing the timeccode of the out-of-standard file. This freeware may be able to correct the time code and save as a standard mpeg so QT will play it all the way through:
http://www.squared5.com/
VLC is a little less picky about standards and chooses to ignore the incorrect timecode of the mpeg.

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