[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [AG-TECH] linux video capture
On Wed, 16 Mar 2005, Robert Olson wrote:
What you might be seeing is this:
On linux, vic captures via v4l at 352x288. On a BT848-flavored card (I think
the Ospreys fall in this class as well as the Hauppauge cards), capturing at
more than 240 lines causes teh capture to happen from both fields, as NTSC
video is two fields of 240 lines each. Hence, you get interlacing effects.
As I recall with vic on windows, it captures at 320x240, so the data comes
from a single field and hence has no interface artifacts.
Isn't that just the difference between 1/4 PAL and 1/4 NTSC. We capture at
1/4 PAL on a BT848 with no interlacing problems. If you can flick your
cameras into PAL mode, and capture at that res, all should be fine I think.
jh