Quote:
Originally Posted by Electronic M
As I understand DVD, all video regardless of region/Video standard (NTSC, PAL, SECAM, mixes of them some countries use) is recorded as series of digital image files which is a grid of pixels. The grid of pixels has 3 digital numbers (each 0-255) for each pixel that represent Y, R-Y, B-Y luminance and color intensity of the pixel (like a jpeg in your computer). The grid is often 640x480 for NTSC, but 720x480 is used on the grid for NTSC widescreen DVDs. All players have matrix math capabilities that scale (remap) the grid to a new grid at the set output resolution (be it PAL, SECAM, NTSC, NTSC widescreen, 1280x720 HD, or 1920x1080HD). That digital output pixel grid is then either converted to analog composite video (at which point the scanning and color subcarrier frequencies are chosen and generated and the digital video is converted to analog component video and then to composite) or the digital pixel grid is passed to an HDMI tranciever that passes the digital pixel grid directly to the monitor. There's deinterlacing provisions that can handle frame rate conversion too.
DVD doesn't capture the composite video signal, the sync, or color burst of the original signal source of the program material on it. Only a grid of pixels of a varying size that gets mapped to the selected output resolution (most players support several output resolutions) inside the Player on playback.
So DVD playback unlike pure analog recording formats is not locked to the resolution standard the DVD was mastered from...If it was then NTSC widescreen DVDs would be unplayable on non-widescreen NTSC TVs (they play fine) and 480P progressive scan monitors would have compatibility issues too.
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The decoded MPEG2 video, European SD DVDs are 720 x 576 and North American SD DVDs are 720 x 483. That is the SD spatial format for both 4x3 and 16x9. SD video, unlike HD video does not have square pixels. Also it is the associated Active Format Descriptor that automatically determines the display is 4x3 or 16x9.
But back the the issue of playback, the recording on DVD is component Y/R-Y/B-Y. It must be PAL or NTSC encoded to be applied to to an analog vintage color TV. I would be curious how the hacked DUAL DVD player, playing an NTSC region DVD would handle the video via the composite analog video output? Will it encode the 525 59.94 video as PAL with 4.43MHz color subcarrier? This would mean a PAL set should be able to display the video in color. The only downside I pointed out is that the convergence would be bad because of the 59.94Hz vs the 50Hz vertical scan difference.
The best bet with the hacked DUAL DVD player to play an NTSC DVD on a vintage PAL color set would be to take the component Y/R-Y/B-Y output of the DUAL, feed it to an NTSC color encoder and then to the NTSC to PAL standards convertor (the one from Amazon). The composite PAL would then feed an RF Modulator to the vintage PAL TV set.