NTSC TV "Shadow Mask" size?

[heavydan]

Almost all of us know that TV's chop a certain area of the outside of the picture by a certain amount which I will call "Shadow Mask".
I live in New Zealand so I don't have much experience with NTSC TV sets. I have come to the conclusion that with PAL TV sets about 28 lines horizontally and 22 lines vertically are lost. So if I use a PAL resolution of 324x266 for my VCD's I get the entire picture fitting exactly on the TV's screen.
My question is, does anyone know the number of lines lost on a NTSC TV when using NTSC footage. I ask this because I do get alot of NTSC footage off the net and I will eventually get a NTSC capable TV in the future.

PS: I suppose those numbers above(28 horizontal/22 vertical) would be either doubled or halved when talking in terms of a full resolution of 704x576?

Thank-you

[heavydan]

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On 2001-12-13 05:18:15, heavydan wrote:
Almost all of us know that TV's chop a certain area of the outside of the picture by a certain amount which I will call "Shadow Mask".
I live in New Zealand so I don't have much experience with NTSC TV sets. I have come to the conclusion that with PAL TV sets about 28 lines horizontally and 22 lines vertically are lost. So if I use a PAL resolution of 324x266 for my VCD's I get the entire picture fitting exactly on the TV's screen.
My question is, does anyone know the number of lines lost on a NTSC TV when using NTSC footage. I ask this because I do get alot of NTSC footage off the net and I will eventually get a NTSC capable TV in the future.

PS: I suppose those numbers above(28 horizontal/22 vertical) would be either doubled or halved when talking in terms of a full resolution of 704x576?

Thank-you
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Come on, surely someone has looked into this before?

Thanks, in advance.

[kinneera]

For NTSC, it seems to be close to 16 lines. I believe the correct terminology for this is "overscan". I'm not positive, but if you want to "correct" for it, what you would actually want to do is make your res 408x332 and then tell TMPGEnc to use the "center" video arrangement. This way it would create a black border around the movie that is 28 lines on left and right and 22 on top and bottom, and this is what would get cut off.

[heavydan]

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On 2001-12-15 23:32:53, kinneera wrote:
For NTSC, it seems to be close to 16 lines. I believe the correct terminology for this is "overscan". I'm not positive, but if you want to "correct" for it, what you would actually want to do is make your res 408x332 and then tell TMPGEnc to use the "center" video arrangement. This way it would create a black border around the movie that is 28 lines on left and right and 22 on top and bottom, and this is what would get cut off.
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Sorry, what I ment was I:
Set output video resolution to PAL 352x288
then go to the clip frame/arrange setting
type in 324x266
This puts a border around the video of 14 lines left, 14 lines right, 11 lines top, and 11 lines bottom.
You don't see the borders on the tv set, it is just to bring all the *real* picture into view.

I hope this helps people understand where I'm coming from.

Anybody know numbers to use for NTSC?

Hey Kinneera, when you say 16 lines, is that each side?

Thanks.

[kinneera]

16 lines on each side is my best guess...someone else might have a more exact number.

[Sergio Leone]

The Following is from the Osprey Vid Capture Card PDF

Video Standard refers to whether the video signal format is NTSC, PAL, or SECAM.
Depending on the exact product version you have, you will see buttons for some or
all of the following formats:
♦ NTSC-M – North America
♦ NTSC-J – Japan
♦ PAL-B, D, G, H, I – many countries in Europe and elsewhere. B, D, G, H, and I
refer to five nearly identical subformats.
♦ PAL-M – Brazil
♦ PAL-N, NC – Argentina, Paraguay, Uruguay
♦ SECAM – France and some other countries

Full-sized NTSC-M, NTSC-J, and PAL-M have 525 lines total, 480 lines visible, per
frame and a display rate of 60 fields per second, or 30 interlaced frames per second.

Full-sized PAL (other than PAL-M) and SECAM have 625 lines total, 576 lines visible,
per frame and a display rate of 50 fields per second, or 25 interlaced frames per
second.
************************************************** *****
The standard frame sizes are different for NTSC and PAL. For example, the halfframe
size in pixels is 320x240 for NTSC, and 384x288 for PAL.
************************************************** *****

Me again,
This frame size difference I think is due to the different Freqs or Hz of the electrical lines of different countries