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**Seán** · 02-02-2003

There is a little catch with converting from PAL to NTSC. PAL is 50 frames per second interlaced and NTSC is 60 frames per second interlaced, making 25 complete frames per second for PAL and 30 complete frames per second for NTSC. In order to convert from PAL to NTSC, the encoder must add in 5 complete frames per second to make up 30 complete frames per second for NTSC, which are typically duplicates of the previous frames and cut down the number of scan lines in the picture to suit NTSC. I've seen this done before, and although the picture quality can still be rather clear, motion and action tends to get a little jumpy; much like watching a DVD on a PC with a sluggish CPU.

02-02-2003	#2 (permalink)
Seán News Coordinator, Reviewer & Senior Moderator Join Date: Jun 2002 Location: Republic of Ireland (North West) Posts: 2,591	There is a little catch with converting from PAL to NTSC. PAL is 50 frames per second interlaced and NTSC is 60 frames per second interlaced, making 25 complete frames per second for PAL and 30 complete frames per second for NTSC. In order to convert from PAL to NTSC, the encoder must add in 5 complete frames per second to make up 30 complete frames per second for NTSC, which are typically duplicates of the previous frames and cut down the number of scan lines in the picture to suit NTSC. I've seen this done before, and although the picture quality can still be rather clear, motion and action tends to get a little jumpy; much like watching a DVD on a PC with a sluggish CPU.