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Why are there black bars in my video playback window?

Views: 1897
Votes: 0
Posted: 01 Feb, 2008
by: Admin A.
Updated: 01 Feb, 2008
by: Admin A.
The black bars, on the left and right edge of your playback window, are part of
the video source material that is being digitized and encoded.  On a TV set or
video monitor, this area is not visible.  But when viewed in a computer window,
you see the entire active video area, both the visible area (Safe Title Area)
and the overscan area (black edges).

The black area or bars vary depending on what video source is being encoded.
Some sources, like live camera feeds, fill up the entire area with video.
VCR's or VTR's do not record the entire video area, therefore you get black
bars on both sides of the image.  When played back on a TV set, you don't see
this area and it appears full screen.

The only way to eliminate the black bars would be to scale the video up to fill
in the black overscan area.  This zooming up of the image would make the
computer window playback OK, but when viewed on a TV set, the image would be
larger than the original and the edges would be cut off from view.

The actual visible area on a TV set, the Action Safe Area, is 648 x 438.
Therefore anything outside that size is not visible on a standard TV or video
monitor.  This is where the black bars exist, therefore they are never seen on
a DVD when played back.  But you do see them in a computer window.  Therefore a
computer DVD playback window is never representative of what a person sees on a
video monitor or TV set.

In MediaPress X version 1.2, you can encode at 704 x 480, which is DVD
compliant.  This eliminates some of the black overscan bars when encoding.  But
as previously mentioned, the computer window playback will be OK, but TV
viewing will be slightly larger.


Document: 10260
Created: 8/6/04
Modified: 8/6/04
Product: MediaPress
Version: 2.4.7z, MediaPress X 1.x
Mac OS: 9.x, 10.x
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