[mythtv-users] VGA to component cables
linux.luser at myrealbox.com
Sun Jan 7 15:52:26 UTC 2007
On 5 Jan 2007, at 14:02, Cory Papenfuss wrote:
>>  <http://www.lenexpo-electronics.com/2M-6FT-ATLONA-HIGH-QUALITY-
>> I think other posters have also conjectured that such a cheap cable
>> surely has no electronics in it to convert from RGB to YPbPr, and is
>> 1) Mis-labelled on the website.
>> 2) Actually outputting RGB.
> This is the actual case:
> No electronics, simply breakout cable for the Red/Green/Blue output
> D/A's and video amps on the video card to connect to RCA
> connectors. The
> video card and *driver* for the card then simply outputs color-
> data (Y, Pb, Pr) out the R, G, B channels... plus adds a "sync-on-Y"
> The card and driver must support this functionality. I do not
> know if anything other than ATI does or whether or not linux drivers
> support it.
I'm confused by this. VGA _by definition_ carries RGB signals, no?
I think you're saying that some ATi cards can, with the right
drivers, output YPbPr through their VGA-output connector. Is this
If my understanding is correct, then the cable above would be better
referred to as a "15-pin D-sub to component video breakout cable"; as
you surmise it will not breakout YPbPr from a _standard vga_ (or SVGA
or XGA &c) output.
The fact that we're having this discussion, and the OP's questions
about its suitability, suggest that the website's labelling of this
cable is misleading - one would reasonably expect to plug a "VGA-to-
component video breakout cable" into a VGA port at one end and a
telly's component inputs and have at least the right colours come out.
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