HardyG6
11th March 2005, 22:49
I use a Yamaha DVD player and have a problem concerning the scaling for the TV playback.
In short words:
PAL standard: 720x576 on a 4:3 TV. So MPEGs in 720x576 are scaled to 768x576 (4:3). But not when I play MPEG4 (XviD) or my authored DVDs. Then this happens:
Source 384x288 (correct 4:3 half size)
=> all parts of the picture are visible
Source 720x576 (PAL standard, mandatory for DVD)
=> upper and lower border are cropped, obviously because the player scales the picture up until it fills the whole width while keeping the 'wrong' aspect ratio, so it becomes too high and gets vertically cropped.
Source 360x288 (like PAL standard, but half size)
=> here the same - picture is scaled up and cropped at the upper and lower border.
I also tried changing the pixel aspect ratio in the XviD encoder settings (square or PAL 4:3), but nothing changed.
I even tried playing a re-scaled XviD with 768x576. I'm sure the player would play it perfectly (looking like the 384x288, but with better resolution) IF the player didn't have a limit for the horizontal resolution of 720. :mad:
Where lies the problem? Is it really the player? I created a DVD (MPEG-2!) from my DV video that's conform to all standards, but the picture is cropped and the aspect ratio is wrong. :(
------------------
CORRECTION: The cropping doesn't happen vertically only, but the whole picture is too big, so it is cropped all around. I would assume that the TV does it wrong, but as far as I know the resizing is done by the DVD player, and when I play a half size video, it fits on the screen.
In short words:
PAL standard: 720x576 on a 4:3 TV. So MPEGs in 720x576 are scaled to 768x576 (4:3). But not when I play MPEG4 (XviD) or my authored DVDs. Then this happens:
Source 384x288 (correct 4:3 half size)
=> all parts of the picture are visible
Source 720x576 (PAL standard, mandatory for DVD)
=> upper and lower border are cropped, obviously because the player scales the picture up until it fills the whole width while keeping the 'wrong' aspect ratio, so it becomes too high and gets vertically cropped.
Source 360x288 (like PAL standard, but half size)
=> here the same - picture is scaled up and cropped at the upper and lower border.
I also tried changing the pixel aspect ratio in the XviD encoder settings (square or PAL 4:3), but nothing changed.
I even tried playing a re-scaled XviD with 768x576. I'm sure the player would play it perfectly (looking like the 384x288, but with better resolution) IF the player didn't have a limit for the horizontal resolution of 720. :mad:
Where lies the problem? Is it really the player? I created a DVD (MPEG-2!) from my DV video that's conform to all standards, but the picture is cropped and the aspect ratio is wrong. :(
------------------
CORRECTION: The cropping doesn't happen vertically only, but the whole picture is too big, so it is cropped all around. I would assume that the TV does it wrong, but as far as I know the resizing is done by the DVD player, and when I play a half size video, it fits on the screen.