madzyzome asked: Television stations have selected one of two HDTV formats to transmit on; 1080i60 or 720p60. This is all fine and dandy for original programming but not for movies and some cartoons that are made originally 24 frames per second. Case and point; FOX transmits 720p60 all the time and when a new episode of the Simpsons airs interlace artifacts can be seen as a side effect of telecine. The ATSC standards state 28 different standards for DTV transmissions total and 12 for HDTV specifically. So why does FOX (and all TV stations for that matter) choose to transmit at a none native frame rate when the ATSC specs are so flexible? Why do they use telecine when its not necessary? If they would just follow the ATSC standards ANY video source can be played back natively.
Ok apparently people are not understanding this question. I want to know why, given all the flexibility in frame rates that the ATSC standard, do TV stations only transmit on one frame rate. This has NOTHING to do with the transmitter, it has EVERYTHING to do with the MPEG2 transport stream. Normally this isn’t a problem going from 30 or 29.97 fps to 60 or 59.94 fps, its just a matter of doubling every frame. This is, however, a problem when you go from 24 fps (cartoons movies) to 60 fps and this is especially a problem in cartoons because telecene introduces interlace artifacts that show up easily on the high contrast and colorful video. Why can’t TV stations change the frame rate in accordance with the media they playing? This is the whole reason why the ATSC made this standard so flexible; so all media can be transmitted in its native frame rates of 23.976, 24, 24.975, 25, 29.97, 30, 59.94, 60 fps.
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