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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Pro AV Forum => Topic started by: Brian Wynn on February 22, 2011, 11:36:41 am

Title: HDMI to DVI Cable
Post by: Brian Wynn on February 22, 2011, 11:36:41 am
I have a Sony HDR FX7 camera with HDMI out and a Kramer VP719xl switcher / scaler.  The scaler has DVI VGA RGB S and Composite in. Output is VGA max resolution is UXGA 1600 x 1200.
This all goes to a pair of BenQ MX812ST projectors that also support UXGA 1600 x 1200.

I purchased a cable that is HDMI to DVI 75' long.  I have not received the cable yet.  I would like to use this for the camera to the switcher.  Will I get HD or at least UXGA 1600 x 1200?  Or will this cable even work? 
Title: Re: HDMI to DVI Cable
Post by: Gareth Marsh on February 26, 2011, 01:39:15 am
I have a Sony HDR FX7 camera with HDMI out and a Kramer VP719xl switcher / scaler.  The scaler has DVI VGA RGB S and Composite in. Output is VGA max resolution is UXGA 1600 x 1200.
This all goes to a pair of BenQ MX812ST projectors that also support UXGA 1600 x 1200.

I purchased a cable that is HDMI to DVI 75' long.  I have not received the cable yet.  I would like to use this for the camera to the switcher.  Will I get HD or at least UXGA 1600 x 1200?  Or will this cable even work?

75' does seem a bit long without some sort of amplifier or extender.

One of your issues will be that your output resolution is a 4:3 ratio image, and most HD cameras will output 16:9HD, but may not do so in 4:3.

In any case, there will be some scaling happening, as the max vertical res of that camera will likely be 1080, and you are at 1200 pixels. (Unless you leave the camera in 16:9).

If your camera came equipped with a component output then you should be able to run at least 720P over component into the switcher.

If you really need a long cable run to your camera, then you might need to look for either an amplified copper cable, or perhaps even fibre optic. Take a look at what www.dvigear.com (http://www.dvigear.com) has.


HTH


Gareth
Title: Re: HDMI to DVI Cable
Post by: Brad Weber on February 26, 2011, 08:44:53 am
I have a Sony HDR FX7 camera with HDMI out and a Kramer VP719xl switcher / scaler. The scaler has DVI VGA RGB S and Composite in. Output is VGA max resolution is UXGA 1600 x 1200.
This all goes to a pair of BenQ MX812ST projectors that also support UXGA 1600 x 1200.
The camera is 1080i or 1920x1080 resolution.  The projector accepts up to 1600x1200 resolution, as wells as 1080i signals, but is 1024x768 native resolution.  Unfortunately, it seems that Kramer no longer has information on the VP-719XL on their web site, so I don't know what resolutions it will accept or can output.

I purchased a cable that is HDMI to DVI 75' long.  I have not received the cable yet.  I would like to use this for the camera to the switcher.  Will I get HD or at least UXGA 1600 x 1200?  Or will this cable even work?
The cable may work, although that is a long cable for HDMI so I hope it is a good one, however that is not affecting the resolution.  What is an issue is that while your projector may accept high resolution signals, it is still 1024x768 native resolution.  This means that the projector internally converts any higher or lower resolution signals to fit its 1024x768 native resolution.  Thus a 1920x1080 image from the camera would be displayed as 1024x576 image on the projector, which is not as high a resolution as the 1280x720 or 1920x1080 HD resolutions.  And there is nothing that can be done with the cable or scaler to improve that, it is a limitation of the projector.

You would also likely get the best result by setting the VP-719XL output to match the 1024x768 native resolution of the projector.  If you set the switcher/scaler output to 1600x1200 that results in the VP-719XL scaling the 1920x1080 1080i signal to 1600x900 and then the projector scaling that to 1024x576.  It would usually be much better to handle that in one 1920x1080 to 1024x576 conversion in the switcher/scaler and have the projector not do any scaling.
Title: Re: HDMI to DVI Cable
Post by: Brian Wynn on March 01, 2011, 07:53:42 pm
Got it!  Camera is set to 1080i via RGB out. Into the 719xl set at 1024 x 768 output. And the Projector is set to 1024 x 768.  Looks great on two 9 x 12 screens.  I know its not HD but it looks a lot better that that 250' amplified composite run from years past.

Thanks