Quote:
Originally Posted by guth
Does the camera deliver video sized 640x480 or 720x480? And in what way is it distorted? And how do you want the final video to be?
|
The camera delivers a video in 720x480px. The image is stretched horizontally (objects appear to be too wide) if square pixels are assumed. I would like the final video to have square pixels while preserving the original height of 480px. The image content should not be distorted in the output.
So here's what I was thinking:
Let's say the camera records an NTSC video with a pixel aspect ratio of 0.912. As I understand it, NTSC has 702x480px frames with a 4:3 aspect ratio plus a buffer of 9px on each side.
In my case the whole buffer contains valid image information and should be preserved, so we actually have a 720x480px video with a 0.912 pixel aspect ratio and a 4.11:3 aspect ratio.
If I wanted the video to have square pixels without distortion while maintaining its original height I would resize the video to 657x480px (4.11:3 aspect ratio). If I resized this video to 640x480px (4:3 aspect ratio) I would assume to end up with a horizontally condensed output.
There is a website about the camera where they address this subject as well:
http://chucklohr.com/808/#Resizing720x480.
p.s.: I'm not sure if I'm still on-topic here and if this is of any value for other readers of this thread. If not, please let me know.