Re: True widescreen perhaps not that true....
- From: "Chris P." <msdn@xxxxxxxxxxxx>
- Date: Thu, 7 Aug 2008 09:33:34 -0400
On Thu, 07 Aug 2008 08:49:10 +0200, Johan Stäck wrote:
And to sum it up: Regardless of which mode you set the camera in, you
always get 720*576 pixels.
However, with the camera in 16:9, the image is visibly compressed X-wise.
A circular object will thus look very elliptical when recorded in
wide-screen.
So, the camera has a true wide-screen sensor, but it compresses the
image to the normal 576 pixels width.
That is correct. DVD is the same way as well. Note that it shouldn't look
quite right if filmed in 4:3 either as 4/3 = 1.333 and 720/576 = 1.25.
Granted that is a lot closer than 1.78 for 16:9.
I also captured a short sequence using Windows movie maker (producing a
DV avi) and played it back using a number of players.
WMP will automatically stretch the picture.
VirtualDub does not stretch.
Quicktime player does not stretch.
VLC media player can't play it at all!(Unrecognized format for
'C:\Widescreen_test\widescreentest.avi')
Rendering in Graphedit 9 (build 060822) does not stretch
The same goes for Graphedit plus
This has been a long standing problem where players don't correctly read
the aspect ratio values. Many players assume square pixels which is not
always the case.
--
http://www.chrisnet.net/code.htm
[MS MVP for DirectShow / MediaFoundation]
.
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