![]() 3.5 megabits/second is dedicated to images, 1,152 kilobits/second to sound, and 40 kilobits/second to subtitles, giving a total of 4.692 megabits/second. 135 minutes playing time requires 4.692 * 135 * 60 / 8, which comes to about 4,750 megabytes. Since the capacity of one side of a DVD is 4.7 gigabytes, the requirement is satisfied for all practical purposes.
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