Only if so itll a very good media Player for todays best content, for the living room 0 Reply Author Jean-Luc Aufranc (CNXSoft) 1 year ago Gaetano 2160p HEVC HDR 10bit 60Hz video decoding should eventually work.
Raspberry Pi Video Player Software Software Decode InAdvertisements Menu About About CNX Software Contact Us Advertisement Consulting Services Work for Us Support CNX Software Privacy Policy Development Kits x86 Arm Linux Development Boards MCU Development Kits Hackable Gadgets My Hardware How-Tos Training Materials Embedded Linux Development Technical Glossary AllWinner How-tos AMLogic How-tos Android How-tos Automation IoT How-tos Freescale NXP i.MX How-tos Raspberry Pi How-tos Rockchip How-tos Reviews Jobs Events Embedded Systems Jobs Events Shop Buy Review Samples Coupon Codes Promos Recommended Products Posted on June 26, 2019 June 26, 2019 by Jean-Luc Aufranc (CNXSoft) - 26 Comments on 4K Video Playback on Raspberry Pi 4 with LibreELEC (Alpha) 4K Video Playback on Raspberry Pi 4 with LibreELEC (Alpha) In my short Raspberry Pi 4 review, I tested 4K video output and playback in Raspbian, and sadly neither are working properly, with video output stuck to 1080p60 even after selecting 4K HDMI in the settings and yes, I double checked for hdmienable4k 1 in config.txt, while H.265 video playback is still clearly using software decode in both VLC and omxplayer.However, LibreELEC team announced support for Raspberry Pi 4 in LibreELEC 9.2 Alpha1 release based on Kodi 18.3 and Linux 4.19.x.
So I downloaded LibreELEC-RPi4.arm-9.1.001.img.gz and flash it to a microSD card with balenaEtcher. The good news is that I could manually set the resolution to 38402160 and confirm it works with my TV, but the refresh is limited to 30 Hz maximum. Other refresh rates currently available include 23.98 Hz, 24 Hz, 25 Hz, and 29.97 Hz. The hardware is capable if 4K 60Hz, so its just a question of time before this is fixed. Note LibreELEC for RPi4 is currently at the alpha stage of development. All were shown to be decoded by hardware with ff-hevc-mmal (HW) video decoder. Raspberry Pi Video Player Software Mp4 Extremely ChoppyI went on to play some 4K H.264 and VP9 videos which are NOT supposed to be supported by the hardware: HD.Club-4K-Chimei-inn-60mbps.mp4 (H.264, 30 fps) Not smooth at all bigbuckbunny4kH26430fps.mp4 Extremely choppy, AV sync issues tara-no9-vp9.webm (4K VP9 YouTube video 60 fps, Vorbis audio) Not smooth at all I was expecting this result, but even worse. Whats strange is that Kodi overlay window implies some sort of hardware decoder is used for both: H.264 ff-h264-mmal (HW) with only one CPU core used for decoding VP9 ff-vp9-mmal (HW) with only one CPU core used for decoding H.264 is not so surprising since VideoCore VI GPU support H.264 up to 1080p60, but theres no word about VP9 at all. Raspberry Pi 4 is supposed to support HDR, but software support has a dependency on the new Linux kernel frameworks merged by Intel developers (with help from Team LibreELECKodi) in Linux 5.2 and a kernel bump will be needed to use them. Watch the video below where I try 4K videos in Raspberry Pi 4 SBC. Raspberry Pi Video Player Software Full Time LaterJean-Luc Aufranc (CNXSoft) Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011. Support CNX Software - Donate via PayPal, become a Patron on Patreon, or buy review samples Advertisements Your browser does not support the video tag. ![]() Please read and accept our website Terms and Privacy Policy to post a comment. Name Email Website I agree to the Privacy Policy The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Comments oldest newest most voted Author Jean-Luc Aufranc (CNXSoft) 1 year ago Ive just noticed that if pixel format is set to rpi videos play smootly, but when set to yuv420p video are choppy. Reply chewitt 1 year ago The default firmware config will result in 4K30 max, but if you set hdmienable4k1 in config.txt the 4K60 mode will show up. Also Big Buck Bunny is 4K H264 which is CPU decoded (H264 hardware decode is supported to 1080p) so it will stutter like crazy. K content needs to be HEVC. Reply Author Jean-Luc Aufranc (CNXSoft) 1 year ago chewitt Ive added hdmienable4k1 to config.txt as follows: Shell. LibreELEC: vi flashconfig.txt 1 2 LibreELEC: mount -o remount,rw flash LibreELEC: vi flashconfig.txt and rebooted the board: Shell. ![]() Reply chewitt 1 year ago Jean-Luc Aufranc (CNXSoft) You might need to stop Kodi, edit guisettings.xml and remove videoscreen.screenmode and videoscreen.whitelist and restart. Im definitely looking at 4K modes 0 Reply hwti 1 year ago Jean-Luc Aufranc (CNXSoft) See, 4:2:0 output isnt currently supported (and given further responses, its unclear whether it could be supported or not). So for 4Kp60 you would need a TV which supports it in 4:4:4 (8 bit), or 4:2:2 (10-12 bit). Reply Author Jean-Luc Aufranc (CNXSoft) 1 year ago hwti OK. So potentially the same problem I had with Rockchip RK3288 processor four years ago 2 Reply Steve 1 year ago hwti Just to add 4:2:2 10-bit isnt a valid HDMI 2.0 output. HDMI 2.0 only supports 4:2:2 12-bit at 2160p50-60 (and from memory also 2160p24-30). My Pi 4B is currently outputting RGB 8-bit 2160p50-60 with hdmienable4k1 and a thread at the Pi Forums confirms that 4:2:0 output is currently not supported (only valid in HDMI for 2160p50-60) and there are question marks about the vertical chroma subsampling processing this would require. SDR 4K TVs that came to market early often only support 4:2:0 8-bit flavours of HDMI 2.0 Read more 2 Reply tkaiser 1 year ago H264 hardware decode is supporte.
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