If you play a PAL vcd or dvd (non-existant LOL) then it'll come up black and white, because of the color standards, i think you can play NTSC on PAL dvd player though, but i know that Comp DRIVES can play both as long as you have the software for it, some can't and some can.
This isn't quite true, either.
Actually, the NTSC vs PAL distinction *for DVDs* is based on resolution and framerate, not colour signal (for television, it *is* based on colour). The MPEG-2 encoding uses its own colour space for colour encoding (YCbCr), not the carrier signals of either video standard.
However, NTSC has a screen refresh rate at 60Hz, not PAL's 50Hz, and the number of TV lines is different (525 and 625 for NTSC and PAL respectively). For this reason, there are multiple different resolutions of MPEG-2 encoding for each video standard: MPEG-2, 525/60 (NTSC): 720x480, 704x480, 352x480, 352x240
MPEG-2, 625/50 (PAL): 720x576, 704x576, 352x576, 352x288
However, the output of a PAL DVD *player* is going to obviously have the PAL colour signal in it to display on your television set, and *that* will appear in black and white on an NTSC television set, if it appears at all.
Few NTSC players can play PAL discs or do the conversion. However, many PAL players can play NTSC discs using a "pseudo PAL" format that preserves the 525/60Hz signal, which many PAL televisions will accept, but uses the 4.43MHz colour subcarrier signal that PAL televisions require for colour display.
Most modern PC and Macintosh DVD player programs understand either video signal without difficulty, and draw the screen at the appropriate size, resolution and refresh rate automatically. Obviously there are no colour encoding problems on a computer monitor.
For more information, look at the DVD FAQ at
http://www.dvddemystified.com.
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