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  #1  
01-19-2003, 10:41 AM
syk2c11 syk2c11 is offline
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Hi there,
I use DVD workshop to author KDVD, it works perfectly. I am wondering if it is worth it to change the resolution from 720x480 (full-D1) to 704x480, I have tried both, DVD workshop accepted both. Is there gonna be a BIG save to use 704x480 (so that I can raise the CQ value)
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  #2  
01-19-2003, 01:55 PM
kwag kwag is offline
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Quote:
Originally Posted by syk2c11
Hi there,
I use DVD workshop to author KDVD, it works perfectly. I am wondering if it is worth it to change the resolution from 720x480 (full-D1) to 704x480, I have tried both, DVD workshop accepted both. Is there gonna be a BIG save to use 704x480 (so that I can raise the CQ value)
Try a couple of small ( 1 minute ) samples with the same CQ value. One at 720x480 and another one at 704x480. How much was the savings

-kwag
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01-19-2003, 09:58 PM
MoovyGuy MoovyGuy is offline
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Well here's another little tidbit that I learned recently.

When planning encodes that are Full D1 and the target is an HDTV:

The mode called 480p is the lowest of the three HD TV modes, but it does not translate to 720x480, but instead 704x480 ... This according to "Widescreen Review" magazine ...

So with this in mind, one can feel good about encoding at 704 instead of 720 as they are simply matching HD spec ....
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01-19-2003, 10:14 PM
SansGrip SansGrip is offline
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Quote:
Originally Posted by MoovyGuy
The mode called 480p is the lowest of the three HD TV modes, but it does not translate to 720x480, but instead 704x480
704x480 is closest to the "real" dimensions of a full frame. While the active video area of an NTSC signal is actually 711x486, most digital video equipment chops off the bottom 6 pixels. With a height of 480 the ideal width for 4:3 AR is 702.2, and 704 is the closest value that is a multiple of 16.

720 is used to provide a margin for error when converting from analog to digital. See this page for more than most people will ever need to know about aspect ratios .
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01-19-2003, 11:14 PM
kwag kwag is offline
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Great link

Thanks SansGrip,
-kwag
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  #6  
01-20-2003, 03:26 AM
Jellygoose Jellygoose is offline
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have you guys tried using blocks TV Overscan of 3 with 720x480?
In my tests, black borders are not visual when viewed on TV... I still save more space with blocks Overscan set to 3 at 720x480 than overscan set to 2 at 704x480...

I'd like to know if you guys have tested this so far...
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01-20-2003, 08:33 AM
kwag kwag is offline
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You might as well encode to 704x480 with 2 overscan blocks. It's the same as 720x480 with 3 overscan blocks

-kwag
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  #8  
01-20-2003, 10:11 AM
Jellygoose Jellygoose is offline
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oh... is that so?

haha well alright... never mind my last post than!
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