RPI4 4k video playback slow

zachbrown · December 1, 2019 at 7:14 PM

I am using a 2GB Raspberry Pi 4 with libreelec 9.2 trying to play a downloaded 4k .webm version of Big Buck Bunny from youtube.. Video is stored on a 500GB samsung SSD connected to one of the USB 3.0 ports. Video playback is relatively smooth but seems set at about 0.50 speed. Other 4k videos I have tried have the same issue.

I added "hdmi_enable_4kp60=1" to my /flash/config.txt after reading the 9.2 release notes.

Anyone know what the issue might be?

Thanks!

ozzotto · January 8, 2020 at 7:31 AM

The same happens to me when trying to play a 4k video with the following specs

Code

Format : AVC
Duration : 52 min 35 s
Bit rate : 28.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.144
Stream size : 10.5 GiB (98%)
Writing library : x264 core 157 r2969 d4099dd
Encoding settings : cabac=1 / ref=5 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=48 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=8 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc=crf / mbtree=0 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.30 / pb_ratio=1.20 / aq=3:0.80
Language : English
Default : Yes
Forced : No

Display More

**Klojum** · January 8, 2020 at 11:01 AM Official Post

Please provide a full debug log.

How to post a log (wiki)

1. Enable debugging in Settings>System Settings>Logging
2. Restart Kodi
3. Replicate the problem
4. Generate a log URL (do not post/upload logs to the forum)

use "Settings > LibreELEC > System > Paste system logs" or run "pastekodi" over SSH, then post the URL link

**HiassofT** · January 8, 2020 at 11:25 AM

This is to be expected, H264 hardware decoding is only supported up to HD resolution. 4k videos should be in HEVC/H265 format, like it's the standard for UHD BluRay.

so long,

Hias

RPI4 4k video playback slow

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