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Old 01-26-2014, 07:47 PM - Thread Starter
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I'm a few months behind (as always), but I see that ffmpeg supports decoding of h.265 content now.

I'm wondering if anyone has had opportunity to use it and, more specifically, what your experience with 4K has been.

In particular, what CPU/RAM/GPU should we shoot for when building a frontend in Linux for playing 4K?

It's been pretty dead around here lately, but I would appreciate anyone's thoughts on the subject even if you haven't had a chance to play around with it.
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Old 01-26-2014, 10:52 PM
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Right now 4K h.264 is the way things are gonna be done because that's what current hardware supports and that will be followed by VP9 very soon. h.265 is still a long ways off because it needs heavy optimization and tuning for widespread use. VP9 hardware decoding should be hitting GPUs with the Volta GPU from Nvidia, Intel's Skylake, and whatever is coming from AMD around that time.
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Old 01-26-2014, 11:28 PM - Thread Starter
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ty.

here's a nice comparison of h.265 vs VP9 --

http://www.trustedreviews.com/opinions/h-265-vs-vp9-4k-video-codes-explained

I'm not choosing sides just yet (except that I hate Google with a passion), but I'm anxious to see which one gets GPU hw accel 1st.
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Old 01-26-2014, 11:53 PM - Thread Starter
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note that ffmpeg also supports VP9.

My goal here is 4K, even if I have to render in SW.

Asking for opinions. :-)
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Old 01-27-2014, 07:57 AM
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Originally Posted by sysadmin View Post

note that ffmpeg also supports VP9.

My goal here is 4K, even if I have to render in SW.

Asking for opinions. :-)

Support in FFMPEG doesn't mean anything if the performance is bad and right now, it's bad for VP9 and h.265 at all resolutions because there is no offloading to hardware for decode functions and the support in FFMPEG is experimental at best. Every test at low resolution that I've seen says significant CPU usage on high-end machines for both codecs and I can only get VP9 to play back in Chromium/Chrome, despite having the latest builds of VLC and FFMPEG.
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Old 01-27-2014, 12:36 PM - Thread Starter
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good info - ty. :-)
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Old 05-10-2014, 06:51 PM - Thread Starter
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I found this video over at youtube with someone testing a 4k monitor in linux using MST mode. --> http://www.youtube.com/watch?v=f8oPyKDriiQ

I didn't know what MST meant, so I found this article: http://www.pugetsystems.com/labs/articles/4K-Monitor-Requirements-and-Usage-492/

"Currently both HDMI and DisplayPort is limited to 30Hz per 4k display so 60Hz monitors like the ASUS PQ321Q have to be a bit creative to get around this limitation. The way that this monitor and others like achieve 60Hz refresh rates is through the use of either DisplayPort in MST (multi stream transport) mode or by using dual HDMI cables to actually run two sub-4k resolution displays side by side on the one monitor. So you are essentially splitting the monitor in half right down the middle with the left side as one display, and the right side as a second display. By doing this, both displays are actually running at 1920x2160 which can operate at 60Hz with current DisplayPort and HDMI specifications."
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Old 05-10-2014, 09:46 PM - Thread Starter
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next round of nvidia "Maxwell" GPU's to support h.265 --> http://www.phoronix.com/scan.php?page=news_item&px=MTY4NTg
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Old 05-11-2014, 10:22 AM - Thread Starter
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a good article on 4k content availability --> http://www.tomsguide.com/us/4k-video-source-faq,news-18021.html
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Old 09-02-2014, 08:13 AM
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4k -what easily works today ...

old school !

analogue output
analogue (high-end, but very cheap) VDC Marquee 9502

Modelines

4k-60Hz interlaced
Horizontal sync frequency: 68.09 kHz
Modeline "3840x2160@60i" 333.94 3840 3872 4872 4904 2160 2209 2220 2269 interlace

3840x1608 @59.94 (2.40:1 - ideal for movies)
Please note: You need a graphic card with 400 Mhz Ramdac

# 3840x1608x59.93 @ 99.125kHz
Modeline "3840x1608x59.93" 396.500000 3840 3888 3920 4000 1608 1611 1615 1654 +HSync -VSync
(Tears of Steel 4k runs fluidly)

My preferred mode. 2560x1440@71.92

Perfect Upscaling from 720p (but REALLY better than 720p)

# 2560x1440x71.92 @ 108.096kHz

Modeline "2560x1440x71.92" 380.497075 2560 2760 3040 3520 1440 1444 1448 1503 -HSync +VSync

For graphic cards with lower bandwidth

Modeline "2560x1440x71.91" 300.000000 2560 2648 2680 2800 1440 1443 1447 1490 +HSync -VSync

& upscaling via xbmc

Quality Choice of upscaling depends on your graphic card and CPU

Believe me - much better than "just" FullHd
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Last edited by as00270; 09-02-2014 at 08:39 AM.
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Old 09-03-2014, 04:31 AM
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Quote:
Originally Posted by sysadmin View Post
I'm a few months behind (as always), but I see that ffmpeg supports decoding of h.265 content now.

I'm wondering if anyone has had opportunity to use it and, more specifically, what your experience with 4K has been.

In particular, what CPU/RAM/GPU should we shoot for when building a frontend in Linux for playing 4K?

It's been pretty dead around here lately, but I would appreciate anyone's thoughts on the subject even if you haven't had a chance to play around with it.

Looks like Skylake will be THE big HTPC upgrade for Linux and Windows HTPC enthusiasts. Unconfirmed reports say the Skylake GPU will have both next-gen codecs in the decoder and both next-gen monitor interfaces with the capability to connect 3 4K monitors. Monitor companies will make a big push for 4K displays in 2016 when the new DisplayPort is available along with HDMI 2.0, so save up your dough.
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Old 09-05-2014, 07:19 AM
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Quote:
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Believe me - much better than "just" FullHd
I do not believe

How far away do you sit from what size screen?
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