XVideo (Xv) feed flickers on mouse-over with certain video

[Bridgman, John]

Are you sure that both players are using the same Xv port ? The radeon
driver exposes both overlay and textured video ports on older cards;
it's up to the player to choose which they use, and different players
have different defaults AFAIK.
 
Which card are you actually using ? NVidia or ATI, and which model ?
 
JB

________________________________

From: Justin Anderson [mailto:justin at rayonix.com] 
Sent: Monday, June 09, 2008 3:31 PM
To: Bridgman, John
Cc: xorg at lists.freedesktop.org
Subject: Re: XVideo (Xv) feed flickers on mouse-over with certain video


Dear John,

Thank you for your reply.  

I'm not sure that there is anything wrong with my X environment.  The
application "tvtime", for instance, is able (with the same environment)
to display flicker-free video with menus and channel information
overlaid.

I'm still hoping for a better clue.

Thanks,

Justin


On Wed, Jun 4, 2008 at 9:37 AM, Bridgman, John <John.Bridgman at amd.com>
wrote:


	>>From: "Justin Anderson" <justin at rayonix.com>
	
	>>I'm trying to resolve a thorny issue.  I'm working on an
application
	built with C/X/Motif in which we have a window where the feed
from a
	video camera is put.  We also draw a set of "cross-hairs"
(simply two
	lines) which can be moved with the mouse to target a point on
the video
	feed (for user's visual reference).  We add the video with the
	"XvPutVideo" command. Everything worked OK until the 6000 series
of
	nVidia graphics cards (as well as ATI cards around-about that
time).
	Since then, the cross-hairs are overdrawn by the video.  If you
move the
	mouse pointer over the video feed, the video flickers as you
move around
	and, simultaneously, the crosshairs appear.  When you stop
moving, the
	crosshairs disappear and the video stops
	flickering.  Accorging to the MythTV website, nVidia cards
stopped
	having a Chroma Key feature with the 6000 series.  I'm not sure
if that
	has something to do with it.
	
	This makes sense. ATI cards also switched from using
overlay-based video
	to shader-based video (aka TexturedVideo) rendered into the
frame
	buffer, starting with the X1xxx discrete and RS6xx IGP parts.
	
	>>I think I can resolve the problem of the cross-hairs being
overdrawn
	by the video feed if I add a Pixmap ClipMask which is black (0)
where
	the cross-hairs are located and white (1) everywhere else.
However, the
	video flickering is still present.
	
	My first thought is moving to a composited environment where
(hopefully,
	maybe) the cross-hairs could be composited over top of the
rendered
	video. Not sure, just a thought. The main issue is that the
video image
	is now drawn directly into memory (allowing it to work with a
	compositing manager) rather than floating over the video memory
and
	being composited via hardware.
	
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-- 
Justin Anderson
Software Engineer
Rayonix, LLC (formerly mar-usa)
justin at rayonix.com
1880 Oak Ave. Ste. 120
Evanston, IL 60201
PH:847.869.1548
FX:847-869-1587 
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