Re: scanline shift down or up

["Paul Forgey" <paulf@xxxxxxxxxxxxx>]

Are these interlaced frames?  Your specific problem may probably be avoided by
asking for only even or odd fields if possible.

I'm experiencing this with input to my bt878, and I too would like to know at
least how to know if the interlaced capture I received with odd:even or
even:odd.  It seems the driver won't let me capture alternating or successive
even/odd, only just odd, just even or interlaced.  I want to feed the frames
into a motion adaptive de-interlacer and having randomly swapped fields will
severely affect the image quality.  Admittedly I can't consider this a bug if
I'm reading the documentation correctly, but it is a deficiency.

----- Original Message -----
From: "alessandro bonvicini" <a.bonvicini@xxxxxxxxxxx>
To: <video4linux-list@xxxxxxxxxx>
Cc: <motion@xxxxxxxxxxxx>
Sent: Friday, December 20, 2002 11:35 PM
Subject: scanline shift down or up


Hi all,
I take the opportunity to send to all of you my best whishes for a  merry
christmas and a happy new year.

Too , I ask if some has already encontered my problem. I have an averez card
with two input that work very well with bttv 0.8.38 and 0.7.100, but
sometimes  the grabbed image is shifted down or up of a scanline in a totally
random way. I use this card with a motion detection program, "motion by
jeroeen vreeken" and this behavior trigger often some falses alarm.
Is there any way to control this problem/bug/feature?
Ans, is there any way to disable the ACG gain control of the card via
software?

Thank  a lot.
Alex

--
Alessandro Bonvicini - Synervis

"L'idea è la moneta del futuro"
Seth Godin (Unleashing the ideavirus)