[mythtv-users] coax vs. composite

[Cory Papenfuss]

> So what's the point of having recording profiles that record at full D1
> resolution, compliant with DVD spec?
>
> http://www.mythtv.org/wiki/index.php/Recording_Parameters
>
> Is that for people who are watching HDTV? Otherwise, it seems like an awful
> lot of waste if all we're really getting through conventional cable is
> technically 440x480.
>
 	If you search the archives, you'll find posts from me three years 
ago saying the same thing.

 	Now, all of that needs to be qualified a bit... the Kell factor I 
mentioned before, as well as the relatively low quality scaling that the 
ivtv-based cards do mean that capturing a bit more might be useful.  I did 
some resolution tests (again... check the archives) and found that there 
is a very slight increase in luminance resolution above 480x480 up to 
about 540x480.  After that, there was no measureable difference.  640x480 
is kinda nice because it's got square pixels (i.e. PC-friendly).  720x480 
is silly unless you want to archive directly to DVD.

-Cory


-- 

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* Cory Papenfuss, Ph.D., PPSEL-IA                                       *
* Electrical Engineering                                                *
* Virginia Polytechnic Institute and State University                   *
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