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Custom resolution (HDMI-PC)?

DM800se custom resolution HDMI-PC

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#1 pr0ton

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Posted 2 June 2013 - 14:38

Using a DM800SE, in one of the latest OpenPLi images, there are only four resolutions in the HDMI-PC list. Is there a way to add a custom resolution using FTP, for example 1680x1050? I couldn't find a plugin to make it work.

 

Also the refresh rate isn't selectable in the HDMI-PC sub-settings.

 

Thanks.



Re: Custom resolution (HDMI-PC)? #2 WanWizard

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Posted 2 June 2013 - 21:04

You can only select the resolutions the hardware supports. I've never seen an STB that supports 1680x1050, which afaik is not a video format at all...


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Re: Custom resolution (HDMI-PC)? #3 pr0ton

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Posted 2 June 2013 - 22:10

Hmm, but a video standard like 720p is nothing more than a resolution and refresh rate. I thought digital signals would be fiexible with that, at least formats like 800x600 and 1366x768 are in the list. Maybe it is limited by the drivers, but no hardware support..



Re: Custom resolution (HDMI-PC)? #4 WanWizard

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Posted 2 June 2013 - 22:13

It isn't any different then with a PC. The resolutions you can choose are limited by the resolutions your video card has on offer.

 

Difference is that the average PC GPU lists dozens, to support all the different formats of PC screens out there. This is not needed with an STB, which is connected to a TV with a limited choice...


Currently in use: VU+Duo 4K (2xFBC S2), VU+Zero, Amiko Viper 2TC, Zgemma H3.2TC, Zgemma H6

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Re: Custom resolution (HDMI-PC)? #5 pr0ton

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Posted 2 June 2013 - 22:32

Really, I thought that a PC GPU can output a custom pixel-precise resolution within it's max: http://hardforum.com...d.php?t=1605511 .

 

Anyhow, this time it is connected to a monitor, too bad the hardware lacks support.



Re: Custom resolution (HDMI-PC)? #6 WanWizard

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Posted 2 June 2013 - 23:10

Depends on the GPU.

 

My VU+Duo for example reports this:

root@vuduo:~# cat /proc/stb/video/videomode_choices
pal ntsc 480i 576i 1080i 1080p 720p 480p 1080i50 1080p24 1080p25 1080p30 720p24 720p50 576p

so all typical TV type resolutions...


Currently in use: VU+Duo 4K (2xFBC S2), VU+Zero, Amiko Viper 2TC, Zgemma H3.2TC, Zgemma H6

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Re: Custom resolution (HDMI-PC)? #7 MiLo

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Posted 3 June 2013 - 10:04

The "correct" thing to do would be that the drivers inquire the monitor about its supported ranges, and automatically pick the mode the monitor likes best. Probably the DMM drivers just return a pre-programmed set of resolutions and don't negotiate anything.
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Re: Custom resolution (HDMI-PC)? #8 Erik Slagter

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Posted 3 June 2013 - 14:27

I am not sure whether the hardware of a stb can support an arbitrary combination of output settings, I do know a VGA card can in fact do that, indeed, although windows drivers usually don't allow you to do so, but using X you can define any mode (within specs, of course).

 

But even then, the modes need to be programmed by the drivers. If the drivers only support a fixed set of x resolutions, that's all you'll get, even though the hardware might be able to support more. Yes, it's a shame indeed.


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Re: Custom resolution (HDMI-PC)? #9 pr0ton

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Posted 3 June 2013 - 14:34

Alright, don't think there is another STB which does this well. Drivers are never open source from the manufacturer I think?



Re: Custom resolution (HDMI-PC)? #10 Erik Slagter

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Posted 3 June 2013 - 14:39

If that could only be true... ;)


* Wavefrontier T90 with 28E/23E/19E/13E/9E/4.8E/0.8W/5W via SCR switches 2 x 2 x 6 user bands
* Ziggo digital cable TV (FTA)
I don't read PM -> if you have something to ask or to report, do it in the forum so others can benefit. I don't take freelance jobs.
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