T3 driving LED monitor

alw50 · Post by **alw50** » Sat Sep 27, 2014 17:24

I don't have a T3 yet -- still investigating.

Suppose for the sake of argument that I want to occasionally use it to drive an LED monitor (optimal resolution 1920 x 1200 at 60 Hz).

And that the monitor has specs like this wrt resolutions supported:

480P (720 x 480 at 60 Hz)
576P (720 x 576 at 60 Hz)
720P (1280 x 720 at 50 Hz to 60 Hz)
1080P (1920 x 1080 at 50 Hz to 60 Hz)

HDCP is supported. It doesn't like interlaced signals.

Can the T3 drive it a) with TV broadcasts b) with HD content from other sources?

thanks!

prl · Post by **prl** » Sat Sep 27, 2014 17:34

The T3 can rescale and deinterlace to 720p, but not 1080p.

Unfortunately, I can't find a proper specifications page for the T3 on the Beyonwiz website. If you go to its product page, and click on the Specifications tab, you get the same big blue button inviting you to go to the launch page as you do for the Product Details tab, with the exception that the big blue button doesn't work in the Specifications page.

Jai?

peteru · Post by **peteru** » Sat Sep 27, 2014 23:13

If the monitor has a real HDMI port it should support standard consumer electronics output modes that the T3 will output. The two devices will (should) negotiate the best compatible format. Even if the monitor does not display interlaced signals, that does not necessarily mean it will not accept those signals and upconvert to whatever it prefers. You'll just have to try it and see. If the monitor does not have a HDMI port, but uses a something-else-port to HDMI cable/adaptor connection, then it may support or not support the standard video modes used for consumer electronics. I would not put too much trust in the specifications for any device in this department, the only true measure of compatibility is to hook it all up and see what happens.

Since the native panel resolution seems to be a lot like a Dell 16:10 monitor, I'd say that it will probably work. Depending on the exact model of the monitor you have, the viewing experience will probably vary anywhere between "just acceptable" all the way to "pretty good."

alw50 · Post by **alw50** » Sun Sep 28, 2014 12:14

Thanks for the replies. It seems the question is more complex than I thought it would be be.

I didn't mention a monitor model because a) I don't have one yet and b) I was hoping for a generic characterization in terms of published specs ie knowledge that could be applied to more than one monitor.

The specs I quoted are for this one (which I am seriously considering, I know there are cheaper monitors but one of its applications is photography):

http://www.imagescience.com.au/products ... nitor.html

I'm pretty sure the HDMI ports would be real ones.

This is what its manual says about interlaced signals

"When using a DVD player or any other type of high-definition device, please do not use interlaced signals. If the monitor detects an interlaced signal, an OSD warning will appear. If this OSD warning appears, please do the following: press the RESET and EXIT buttons simultaneously, to temporarily show the image coming from the high-definition device. While the image is visible, change the signal of the device from interlaced to progressive (non-interlaced). Consult the User’s Manual included with the device for detailed information on changing the signal from interlaced to progressive."

In other words, get the source device to do it. Hence my question here.

I have now found a T3 manual. This is what it has:

Video resolution: CCIR601(720x576lines), 576p, 720p, 1080i, 1080p@30

No Hz mentioned, but presumably 50Hz. Does anyone know what 1080p@30 means?

Thanks again!

MrQuade · Post by **MrQuade** » Sun Sep 28, 2014 12:31

alw50 wrote: No Hz mentioned, but presumably 50Hz. Does anyone know what 1080p@30 means?

The @30 means "at 30Hz".

The T3 can do 25/50/30/60 Hz framerates at various combinations of resolutions

(Courtesy of PeterU) When you run:
cat /proc/stb/video/videomode_choices

You get the following output:
pal ntsc 480i 576i 480p 576p 720p50 720p24 720p25 720p30 720p 1080i50 1080i 1080p25 1080p30

Alternatively:
cat /proc/stb/video/videomode_50hz_choices
pal 576i 576p 720p50 1080i50 1080p25

cat /proc/stb/video/videomode_60hz_choices
ntsc 480i 480p 720p 1080i 1080p30