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What is going on with NTSC DVD framerates for film content?

April 26, 2017content DVD Film framerates going NTSC

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What is going on with NTSC DVD framerates for film content?

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NTSC DVDs are always encoded for an output framerate of 59.94 fields per second, however, you are allowed to mark frames as being progressive and having a duration of three fields. There are two flags on each frame of video: top_field_first, and repeat_first_field, which you must watch. They lets you encode 23.976fps film sequences on a DVD.