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by stag019
Tue Jan 27, 2015 7:22 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

There's a difference between using a UI in 4K and playing a 4K video file. I can use Raspbian's CLI or GUI in 4K (and OpenElec's GUI), but I can't get the processor to decode a 4K video file.
by stag019
Thu Jan 08, 2015 7:35 pm
Forum: Graphics, sound and multimedia
Topic: Monochrome YPbPr Support?
Replies: 4
Views: 1166

Re: Monochrome YPbPr Support?

I still think this would be possible to implement in the firmware. Unforunately, I doubt it would be very likely seeing as how little use case it would get and how much more important work the foundation has. But, here's an example of how I think it could work (for 480i): sdtv_mode=24 sdtv_timings=1...
by stag019
Sat Nov 29, 2014 5:17 pm
Forum: Graphics, sound and multimedia
Topic: Monochrome YPbPr Support?
Replies: 4
Views: 1166

Re: Monochrome YPbPr Support?

Because spending the same amount as, if not more than, a Raspberry Pi on a converter box doesn't always seem to be the most appealing option to some people. Plus, where's your sense of adventure?
by stag019
Sat Nov 29, 2014 3:07 am
Forum: Graphics, sound and multimedia
Topic: Monochrome YPbPr Support?
Replies: 4
Views: 1166

Monochrome YPbPr Support?

I know a guy who happens to have a decent 50 inch TV that was made in the narrow range of "after HD became a thing" but "before digital became a thing". As such, he has YPbPr cables on his TV, but no HDMI. Now, I was reading through raspberrypi/userland/interface/vmcs_host/vc_sdtv.h and noticed that...
by stag019
Fri Nov 14, 2014 8:22 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

Okay, so I tried a bunch more timings and managed to find some that I like. I was able to get 28Hz without overclocking at all. Here are the minimal settings for that (included 24Hz and 25Hz since those seem to be common frame rates for videos): disable_overscan=1 hdmi_ignore_edid=0xa5000080 hdmi_gr...
by stag019
Thu Nov 13, 2014 10:32 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

So I know that Seiki has stupid discrepancies in EDID data not just between each model, but between the different firmware for the different models too. So I was looking online, and I found a couple of timings for some 3840x2160 resolutions in my quest to try to get better than 24Hz working (with hd...
by stag019
Thu Oct 09, 2014 1:45 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

Using omxplayer may be easier. That already support the "--win" option to decode the video to a specific region. Try running 4 concurrent omxplayers with --win set to each quarter of the screen. Set gpu_mem and overclock high... Oh, that's pretty cool. With my settings right now, it has no problem ...
by stag019
Wed Oct 08, 2014 4:16 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

If you just wanted a proof of concept, then decoding 4 1080p streams may be possible, but i suspect you will hit performance and possibly memory limits. So I've been trying to figure out how to do something even remotely like this, but to no avail. Could you figure out some modifications to "video....
by stag019
Sat Sep 06, 2014 6:18 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

Aha! I had framebuffer_width/height, but not max_framebuffer_width/height. That did the trick. So awesome! Thanks. :) At first, I was experiencing the same blue artifacts flickering at above 15Hz. But then overclocking (but without overvolting) I was able to get 24Hz working on both Raspian and Open...
by stag019
Fri Sep 05, 2014 6:35 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 123
Views: 156808

Re: Raspberry Pi and 4k @ 15Hz

I've been trying this with my Seiki 39in. TV. The TV itself does state that it's in [email protected] mode, but the framebuffer still maxes out at 1920x1200. Using fbset to try and set it to anything below 1920x1200 works fine, but trying to set it higher causes the screen to become black, of which som...

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