Looks like nuppelrec is probably handling it correctly. If I record at 720, 704, or 640x480 the image turns out measuring the same every time. My recent post saying there was a difference is because I'm testing it by recording a football game on ESPN. They periodically put a bar at the bottom of the screen and when they do this they shrink the screen a little bit which was what was causing me to believe there was a difference from one recording to the next :-) So looks like I'm OK staying with a capture of 720x480. If I recall nuppelrec was telling v4l2 all the correct information, and in fact I get the right look no matter what horizontal resolution I give.
-- Ray
Steven M. Schultz wrote:
On Wed, 29 Dec 2004, Ray Cole wrote:
I tried recording at 704x480 and 720x480, and you are correct that if I put a piece of paper to measure the size of some objects there is a measurable difference. So I suppose I'll start using 704x480 :-) Not that
The thing to try is find something with a lot of (perfect) circles.
I'll re-record all the stuff I've recorded before since 2% is really hard to see, but I guess 704x480 will be the 'correct' way.
I wonder though if the difference might not be 9% - I don't know if the application is specifying square pixels or not.
An experiment would be to record at 640x480 and do a software resample (y4mscaler can do it) to 704x480 and then see what it looks like.
Steven Schultz
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