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Owen W. Taylor authored
The first version of the video-timer simply played back the video according to the wall clock, and showed each frame at the neareste presentatin time. But an alternative strategy for playing back video is that if the frame-rate is an integer-divisor of the display refresh rate, or very close to that, is to change the playback speed to complete avoid frame drops and changes in latency. (This would require resampling audio if present.) Demonstrate this technique by adding a --pll option to the video-timer demo. https://bugzilla.gnome.org/show_bug.cgi?id=685460
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