At 06:28 AM 10/23/2008, leafnose wrote:
>BTW, when using VLC media player and view the new clips I can select
>to "blend" the clip and it removes the ghosting issue.
>
>Can someone explain why?
HDV 1080i footage is interlaced; it alternates displaying even and
odd fields within a frame. That is, it alternates between displaying
all the even-numbered lines with displaying all the odd-numbered
lines. When there's motion on the screen, the odd field will hold a
different image than the even field.
That's fine if your display can interlace as well, but a computer
screen is progressive -- that is, it displays all lines in a single
frame, combining both even and odd fields to display them together.
If there's motion, each field shows a slightly different image, and
when the two are combined at the same time in the same frame you get
"ghosting."
VLC media player has a variety of different de-interlace settings,
including blend, that work to get rid of interlace ghosting on a
progressive computer monitor. I'm not sure exactly how it reconciles
the two different fields within each frame, but it does a good job of it.
If you're editing for display on a monitor that can interlace, then
you can ignore the ghosting in display on your computer screen. If
you're exporting for display on a computer, then it's a good idea to
set Premiere to de-interlace your video for export.
Mike Boom
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