Linux distributions with working 4K video decoding

hooby3d

Are there any OS builds available that offer working 4K HDMI video support?(Ability to play a 4K video on a 4K display over HDMI, at ~ 30 fps)

What I have tried with OpenELEC has not been successful.

Are there any recommendations?

RagnerBG

Try Armbian Desktop with built-in mpv player. It should be possible. I made it to work before with self built mpv, ffmpeg, libvdpau-sunxi, codecs and other stuff. And (most of) supported 4K videos was played with h/w acceleration. Maybe it will work the same in Armbian, without touching anything. If not, you can build everything from scratch too.

pmpp

Did you try h3droid ?  We'd love to hear about 4K physical display playback ... ( H3Droid is not only android, under the hood it is also armbian )

hooby3d

RagnerBG replied at 2017-7-18 22:07
Try Armbian Desktop with built-in mpv player. It should be possible. I made it to work before with s ...

Thanks - I have the Armbian desktop running at 4K, but opening the video files fails or causes glitches.

Is there any other configuration necessary?

RagnerBG

hooby3d replied at 2017-7-24 12:00
Thanks - I have the Armbian desktop running at 4K, but opening the video files fails or causes gli ...

It should work. What board do you have? The one's with 512Mb RAM, like Opi One/Zero. doesn't have enough video memory for 4K video decoding. In this case you can try in Armbian build envirounment, to increase ION reserved memory to at least 192Mb, or to 256Mb like it is on boards with 1Gb RAM (but this may cause OS crashes if you reserve too much and it is all usable in some case) and make your own build image. If the problem is not in RAM, maybe it is in built-in mpv player. You can try to self build it from source. This is the way i used to do it (but it can be outdated allready, i don't have time and desire to test again):

1. git clone https://github.com/mpv-player/mpv-build.git
   
2. cd mpv-build
   
3. ./update
   
4. rm -f mpv-build-deps_*_*.deb
   
5. mk-build-deps -s sudo -i
   
6. echo --enable-nonfree >> ffmpeg_options
   
7. echo --enable-gpl >> ffmpeg_options
   
8. echo --enable-version3 >> ffmpeg_options
   
9. echo --enable-vdpau >> ffmpeg_options
   
10. echo --enable-libass >> ffmpeg_options
    
11. echo --enable-libfdk-aac >> ffmpeg_options
    
12. echo --enable-libfreetype >> ffmpeg_options
    
13. echo --enable-libmp3lame >> ffmpeg_options
    
14. echo --enable-libopus >> ffmpeg_options
    
15. echo --enable-libtheora >> ffmpeg_options
    
16. echo --enable-libvorbis >> ffmpeg_options
    
17. echo --enable-libvpx >> ffmpeg_options
    
18. echo --enable-libpulse >> ffmpeg_options
    
19. echo --enable-libv4l2 >> ffmpeg_options
    
20. echo --enable-libx264 >> ffmpeg_options
    
21. echo --enable-libx265 >> ffmpeg_options
    
22. echo --enable-libmpv-shared > mpv_options
    
23. ./rebuild -j4
    
24. sudo ./install
    
25. sudo ldconfig
    
26. cd ..
    
27. mpv

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Then i used this config:

1. sudo nano /etc/mpv/mpv.conf - Ubuntu Xenial / sudo nano /usr/local/etc/mpv/mpv.conf - Debian Jessie:
   
2. vo=vdpau
   
3. hwdec=vdpau
   
4. framedrop=vo
   
5. hwdec-codecs=all
   
6. sub-codepage=enca:bg / sub-codepage=cp1251 / subcp=enca:bg #use one of these for subs and replace with your contry code here.

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I think, with this config, 4k video worked. If still doesn't, maybe you need to repuild some other stuff too - codecs, libvdpau-sunxi, mali driver, but i wouldn' t touch the last two if not needed.

hooby3d

Thank you - I am actually testing on a board with 512 MB RAM (OPi One).
Can the ION reserved memory be set at runtime or through a config file?

RagnerBG

hooby3d replied at 2017-7-27 11:03
Thank you - I am actually testing on a board with 512 MB RAM (OPi One).
Can the ION reserved memory  ...

No, it's not like on A10/20, where you can reserve video memory through config file. It has to be done in kernel building. This is what you need to read - Building Armbian. You have to edit compile.sh and set - KERNEL_CONFIGURE = yes. Then in edit prompt, that will show up, you have to locate ION section. It was somewhere in Drivers and edit this parameter:

1. CONFIG_ION_SUNXI_RESERVE_LIST="160M@0,256M@0,130M@1,200M@1"

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Change the first parameter - 160M, to something bigger - 192M, 224M, 256M, etc. Or you can manually edit kernel config file. It is located in -  build/config/kernel/linux-sun8i-default.config for H3. Look for the above option in this file and edit it directly there. But in this case you probably have to set FORCE_CHECKOUT = no (maybe in first option too, if it doesn't work), in compile.sh . Armbian guys are sensitive in touching their sources , they provide some userpatches option instead, which is too complicated and uncertain for me. But you can try it too, if you know what to do. After you tweak kernel for necesscary ION value, you can build the whole new image, or use the quick way and build only kernel, then apply .deb file in working Armbian and reboot. system.log will show you what is the actual ION reserved memory.

  

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