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-   -   KDVD: Explain Overscan (http://www.digitalfaq.com/archives/encode/13814-kdvd-explain-overscan.html)

supermule 09-17-2005 08:05 AM

Explain Overscan
 
Can someone explain overscan in detail/point to a guide. Okay from what I know, its the left and right edges on the screen, analogue devices are effected, digital are not......thats all good, but I have few questions :

- When used, what does it do to the source picture, does it squeeze/expand the left/right edges.

- Is it recommended to use Overscan for playbacks on Digital devices (LCD, plasma).

- any examples with pictures ??? for understanding.

rds_correia 09-17-2005 09:02 AM

Hi supermule,
If you encode a movie with overscan enabled then you will see the whole encoded image on an analogue device but you will see black bar on the right/left edges of the screen if you play it on a digital device.
So if you plan on playing your encodes on a digital device I would advise you to encode without overscan.
Overscan can be done in one of two ways: resized overscan or overlaped overscan.
resized overscan - You never loose a single pixel of your movie but you will have taller black bars on top and on bottom plus the left/right 8/16/24 pixels. In such case, use your TV functions to zoom the image on screen so that it covers the left/right black bars.
overlaped overscan - You always loose 8/16/24 pixels of your movie on the left/right borders but you don't need to use your TV's zoom feature to get rid of the black borders.
Choose the one you like the most.
I hope I didn't forget of mentioning anything :)
Cheers

supermule 09-17-2005 10:00 AM

Quote:

Originally Posted by rds_correia
Hi supermule,
If you encode a movie with overscan enabled then you will see the whole encoded image on an analogue device but you will see black bar on the right/left edges of the screen if you play it on a digital device.
So if you plan on playing your encodes on a digital device I would advise you to encode without overscan.
Overscan can be done in one of two ways: resized overscan or overlaped overscan.
resized overscan - You never loose a single pixel of your movie but you will have taller black bars on top and on bottom plus the left/right 8/16/24 pixels. In such case, use your TV functions to zoom the image on screen so that it covers the left/right black bars.
overlaped overscan - You always loose 8/16/24 pixels of your movie on the left/right borders but you don't need to use your TV's zoom feature to get rid of the black borders.
Choose the one you like the most.
I hope I didn't forget of mentioning anything :)
Cheers

Thanks,

Got it loud and clear rds.

incredible 09-17-2005 10:35 AM

http://www.incredible.de.tf/aspectratios.html

rds_correia 09-17-2005 10:38 AM

Damn!! :?
I completely forgot that Andrej has it clearly explained at his webpages.
Thanks Andrej :D

Gre1 12-23-2006 03:42 PM

thanxs for this cuz i am rusty on this stuff and i was wonderin why i was gettin the borders around the movie on the sides


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