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Old February 18th, 2002, 07:25 AM   #1
gizmofisen
 
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Capture problem

Hey.

I have a problem when I capture clips. The clips gets a little bit strange. It's like i see 2 "pictures" in one frame. If I pause the clips I've captures I see "lines" of the next frame.

When I look at my films on the tv it looks okey this is only when I capture on my computer. I use Adobe Premiere.

SiŠ
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Old February 18th, 2002, 10:18 AM   #2
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
This sounds like interlacing you are describing. TV systems
are interlaced system. They build up your picture in two
passes. The first pass builds half of the full image, the
second pass the other half. There is a slight difference
inbetween these passes (1/25th of a second on PAL
systems and 1/30th of a second on NTSC systems).

If your camera captures interlaced (what allmost all
cameras do, few of them support progressive or
frame modes) and you view this on your monitor
you can see the small time difference on pieces that
move (people, cars etc.) or on the whole picture if
you moved your camera. This is because computer
monitors are progressive. They show the whole
picture in one pass, not two. Since you recorded
it with a small time difference, they are showing it
incorrect. Mostly this is not a problem (it isn't for editing
anyway).

If you want to leave it interlaced, shoot progressive
or de-interlaced on your PC depends on the media
you want to output too. If it is going to be the internet
your going to lower the resolution of the output file
removing the interlacing automatically. If you go back to
videotape (thus TV systems) you can leave it at interlaced.
If you go to DVD you can make a choice. Stay interlaced
or go progressive. That depends on your preferences.

Hope this has helped some.
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Old February 18th, 2002, 01:38 PM   #3
gizmofisen
 
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single frame

Thanks for the answer... It was very helpful. But then I still have one problem. How do I do If I want to get a single frame without the lines and save it like a picture?

SiC
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Old February 19th, 2002, 02:46 AM   #4
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
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There are three solutions in Premiere as far
as I know, two of them change
your movie, lets begin with those:

(1) show everything de-interlaced
Right-click on your video in the timeline
and choose Video Options -> Field Options
Then select Always Deinterlace...

(2) use a de-interlaced filter
Try the Field Interpolate filter from
the video tab (dragging it onto your
footage)

(3) export a still frame de-interlaced
When exporting a frame go to the Special
Processing option (from the pulldown menu).
Hit Modify and select Deinterlace, click OK.

I've not done much de-interlacing much so
experiment with these techniques to see which
fits you best. You also can look at Reduce
Interlace Flicker filter and options you see
scattered around. I think option 3 is best
if you only want a nice picture exported
since you do not need to modify your movie.
It will only use the de-interlacing when
exporting.

Good luck!
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