45worlds Forum - View Single Post - DVD formats NTSC vs PAL and the 'cut film' argument

6th Sep 2016, 1:09 PM
	albert oh well, la di da Member since Aug 2013 1345 Points	NTSC conversions need some techie stuff with interlacing for the film to play at the right speed. This wikipedia article has all the techie info on interlacing. Effectively the interlacing doubles the refresh rate in NTSC but the display is fragmented ie slicing/removing half the information per frame, and 30 frames then becomes 60 half frames. During the film capture and conversion a similar techie slicing process takes place so 24 frames become 48 sliced half frames. A bit more techie stuff is then applied so every 4 interlaced half frames of the film get mapped/stretched onto 5 interlaced half frames in NTSC. There are several methods of achieving it - some methods give good results which are not too noticeable but other methods give clunky results which are painfully noticeable. The bad results with interlacing are often referred to as 'combing' problems. One of the infuriating things with film companies is that the mastering for DVDs is often poorly handled, so we occasionally get a PAL format DVD which is obviously a conversion from a NTSC digital source and includes all the combing problems therein. Edited by albert on 6th Sep 2016, 2:57 PM

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