Re: PVR hardware selection help

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Billy Biggs writes:
 > Mike Frisch (mfrisch@xxxxxxxxxx):
 > 
 > > > This whole issue of field-orientation is a messy business, and this effect
 > > > does depend on whether the original video is field-based.  Often its
 > > > frame-based, like film - in which case these problems aren't so obvious.
 > > 
 > > I presume this is a non-issue if I was to use a progressive scan capable
 > > television set?
 > 
 >   You'd still get judder.
 > 
 > > Many HTPC users have their PCs connected directly to front projectors
 > > (using a progressive scan mode) and do not complain of these problems,
 > > so I presume it's simply an issue of an interlaced display.
 > 
 >   Because everything they output is progressive, so they have to
 > deinterlace.  And most reasonable Windows apps for high quality video
 > sync to the vertical refresh which is difficult under Linux (for
 > example, dScaler does).
 > 
 > > > I just put up with this at the moment - but more power to Billy with
 > > > efforts to fix it properly.  Though my approach would probably be to
 > > > work on XVideo to provide a hook into the physical VSYNC.
 > > 
 > > Sounds like this is a non-trivial update to the X server.
 > 
 >   Yeah, which needs more discussion as to what best to do.  I wish more
 > developers were interested in it.
 > 
 
AFAIK, DirectFB supports deinterlacing for v4l devices and seems to me
a better choice for a VDR than X11. Now, it even supports OpenGL according to
their latest log. Have a look at directfb.org.

Marcus





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