[mythtv] 4:3 content on 16:9 HDTV & Black bars - revisited

Tue Sep 14 21:24:18 EDT 2004

> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org 
> [mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of Mark Spieth
> Sent: Tuesday, September 14, 2004 8:05 PM
> To: mythtv at moasat.dyndns.org; Development of mythtv
> Subject: Re: [mythtv] 4:3 content on 16:9 HDTV & Black bars - 
> revisited
> 
> you can always then reduce the dimensions of the dest 
> rectangle so it doesnt go to the edge.
> src rect will be zoomed to dest rect but since dest rect 
> doesnt go to the side it will be left at the overlay color.
> this way you can have your 4:3 in a 16:9 or other frame but 
> still have black borders at the side. dvb here does this lots 
> ;-). thus no fat people.
> mark
> 
> > > > I've done a version of a non-linear horizontal image
> > > scaling function
> > > > that would stretch the edges of the video to the edge of the TV 
> > > > but keep the center more or less at 1-to-1.  My Hitachi HDTV
> > > has this mode
> > > > built-in, as do many other HDTV's I imagine.  The 
> problem with the 
> > > > code right now is
> > > that
> > > > it is written in C and only has MMX code for Intel assembly
> > > syntax and
> > > > I assume it needs to be AT&T assembly.  The C code would
> > > most likely
> > > > not be fast enough, even on the fastest systems right now.
> > > If someone
> > > > would like to convert it, I could make it available.
> > > Otherwise, I'll
> > > > continue to
> > > work
> > > > on converting it to AT&T.
> > >
> > > you dont need to do that.
> > > see the XvShmPutImage function in videoout_xv et al.. this does 
> > > scaling for you without loading the CPU.
> > > just change the src dimensions appropriately and it happens 
> > > automagically by the zooming overlay mechanism in the video card. 
> > > (if it works correctly).
> > > maximum you have to do is to reformat and crop the image 
> unless the 
> > > subimage can be explicitly defined. i.e. just a series of 
> memcpy's 
> > > worst case.
> > >
> > > mark
> > >
> > > >
> > > > Besides that, I currently have no idea how it would get 
> integrated 
> > > > into MythTV or MythVideo.  I planned to jump off that
> > > bridge when I got to it.
> > > >
> > > > > -----Original Message-----
> > > > > From: mythtv-dev-bounces at mythtv.org 
> > > > > [mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of
> > > Buechler, Mark R
> > > > > Sent: Tuesday, September 14, 2004 2:54 PM
> > > > > To: 'Development of mythtv'
> > > > > Subject: RE: [mythtv] 4:3 content on 16:9 HDTV & Black bars - 
> > > > > revisited
> > > > >
> > > > > Sony rear projection 65". The TV is typically on from 
> 5:00PM to 
> > > > > 11:00PM weekdays and during the day on weekends. I have
> > > DirecTV so
> > > > > all content is
> > > > > 4:3 but some is 16:9 in a 4:3 format which I expand 
> to fill the 
> > > > > screen. I try to do that as much as I can.
> > > > >
> > > > > - Mark.
> > > > >
> > > > > -----Original Message-----
> > > > > From: Jason W. Thompson [mailto:GameboyHippo at classicnet.net]
> > > > > Sent: Tuesday, September 14, 2004 2:13 PM
> > > > > To: Development of mythtv
> > > > > Subject: Re: [mythtv] 4:3 content on 16:9 HDTV & Black bars - 
> > > > > revisited
> > > > >
> > > > > What brand of HDTV do you have?  Do you leave myth front
> > > end on for
> > > > > long periods of time without turning the TV off?
> > > > >
> > > > > On Tuesday 14 September 2004 10:12, Buechler, Mark R wrote:
> > > > > > I asked a question a few months ago about watching 4:3
> > > content on
> > > > > > a
> > > > > > 16:9 screen with the black vertical bars. I didn't get
> > > much of a
> > > > > > response and I really haven't thought of it much until
> > > > > recently when I
> > > > > > looked at a movie which had some bright (almost white)
> > > scenes and
> > > > > > I noticed, very clearly, the effects of the black bars. The
> > > > > 4:3 area of
> > > > > > the screen looks noticeably more yellow than the 
> black-barred 
> > > > > > portions. I looked at the code and it seems the 
> black bars are 
> > > > > > generated from an X definition of black (possibly coming
> > > > > from xcolormap?).
> > > > > I'm not real familiar with X calls.
> > > > > >
> > > > > > I'd like to slow down the effect of the black bars by 
> > > > > > adjusting the black to a dark gray. Before I look 
> further into 
> > > > > > it, has anyone already
> > > > > done so?
> > > > > > Is there a patch already out there? I'm quite concerned
> > > > > after seeing
> > > > > > the effects on a TV which is only a year old and doesn't
> > > > > get much use
> > > > > > during the day.
> > > > > >
> > > > > > Thanks, Mark.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Bausch & Lomb
> > > > > > 150 Years of Perfecting Vision, Enhancing Life (TM)
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
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> >
> > Wouldn't that result in just a linearly scaled image?  I don't have 
> > the source handy at the moment but I have yet to find an 
> image scale 
> > function that can stretch the images more towards the edges while 
> > leaving the
> center
> > of the image intact.  All I've ever found is just a linear 
> scale that
> makes
> > everyone look fat in the image.
> >
> >
> 
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It's the black bars on the side that I'm trying to get rid of.