Newbie Question ! Capture Sizes and Resizing

[GanjamanUSS]

Can I just get this straight because I'm a bit confused to be honest with all the capturing and resizing.

If I am trying to capture off of a PAL UK source and the programming is widescreen

do I thus capture off the source at 720x480 then resize to 640x352

I've read through the capture guides a lot and still can't figure out if this is the optimal capture

I'm capturing off of Sky Digital (a UK satellite provider) and capturing through an S-Video in to a BT878 compliant capture Card (avermedia)

could someone just explain the optimum capture size and a nice middle resize (around the 640x352 area)

also if someone could describe similar settings for 4:3 I'd be much obliged, the whole thing is rather confusing at best :)

Many Thanks

[Arachnotron]

If you are capping PAL via s-video, you must cap 576 lines. Any cleaning up of black borders or resizing must be done afterwards. Whether or not the source is widescreen does not matter for analogue capping.

The only other option would be capping 288 lines (half frame)

Any other vertical resolution will result in interlacing artefacts which are almost impossible to repair afterwards. If you must change the vertical resolution or cropping, do it AFTER capping and deinterlacing/IVTC (see the cap guide for that)

By the way, 480 lines is NTSC.

[GanjamanUSS]

so what are you saying to me then are you saying that I have to capture in full pal or not ?


so if I capture in full pal what do I do to downsize after that . . .

please explain

please please please :)

[jggimi]

Hello, GanjamanUSS, and welcome to Doom9's forum.

Your final resolution will depend upon your output format, which you haven't described. You've read guides, but perhaps you missed the Capture Guide (http://www.doom9.org/capture.htm), which covers SVCD, VCD, and AVI. That guide doesn't cover DVD output. If you intend to produce DVD, you would not resize, and there are three other guides I could point you to.

[GanjamanUSS]

no the output is to XviD for archiving but I want a smaller res like around the 640x352 area

sorry should have specified

Input : Sky Digital PAL Signal via S-Video into
Avermedia BT8x8 Type Capture Card

Output : XviD file speed/quality both issues and resizing down also an issue . . .


Many Thanks

[jggimi]

See chapter 4.3.

[Wilbert]

This GKnot section only describes the compressibility test.

If your source is letterboxed widescreen (or full screen), that is 4:3. You can capture at 720x576 and resize to 640x480.

If your source is widescreen, that is 16:9. You can capture at 720x576 and resize to 640x352 (640x360 would be exact, but 360 isn't mod 16).

I guess you are dealing with the second situation, so you were indeed correct :)

[GanjamanUSS]

many thanks for the reply wilbert I am investigating was in spain for a while so gonna test this all out now :)