Damien: That sounds like the 24fps/25fps issue.
Outside of the US, the standard for video (with few exceptions) is 25 frames per second. (US uses a hair under 30fps). Movies are universally filmed at 24 fps. This is generally dealt with by simply playing the movie at 25 fps, which is a 4% increase in speed. A 100 minute movie now shows in 96 minutes. The pitch shift is only noticeable (to most people) when doing a side-by-side comparison. Today, most studios do a pitch transformation on the audio, so even that is not an issue. (The alternative, that is, repeating every 24th frame, would produce a noticeable jitter.)
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