[mythtv] Box Processor Limits
bfoddy at visi.com
Tue Jan 21 22:16:54 EST 2003
On Tuesday 21 January 2003 06:38 pm, Bruce Markey wrote:
> There isn't a specific set but some random thing don't
> work. As Robert pointed out, it really make sense to
> only use a height of the number of raster lines (480)
> or the lines in a interlace half frame (240). Anything
> else is doubling a line or skipping every third line or
> whatever. Width is a matter of the chip's clock being
> set to latch a some point in time and sampling the analog
> signal at that point. Any value could work but some don't
> so I use values that I've seen elsewhere; 720 is the bttv
> max, 640 is 4:3, 480 is the MythTV default, 352 is ReplayTV
> "Standard" quality, 320 is a half sized frame.
> 720x480 640x480 480x480 352x480 320x480
> 720x240 640x240 480x240 352x240 320x240
> Okay, 720x240 makes no sense. You're better off with more
> raster lines so I'd also prefer 320x480 over 640x240 for
> that virtual size. So, a better list from high to low
> would be:
> 720x480 640x480 480x480 352x480 320x480 480x240 352x240 320x240
> > So I was about resigned to the standards
> > then I saw your note of yet a new combination that apparently works.
> > I was trying to stay with the same 4x3 ratio, but apparently that's
> > not needed either.
> Right, 4x3 isn't needed but if it is played back at the
> default dimensions it will look odd. This happens in myth
> if you press "f" to leave fullscreen mode. In 0.8 there
> is an option to always stretch the picture to 4:3 if
> you record at odd resolutions.
Perfect info, it never dawned on me to have the vertical greater
than the horizontal res, but your description makes sense.
Thanks a lot.
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