Posts by evil77

Just wanted to give feedback;

bossanova808s fix did the job on my old Intel NUC DN2820

so big thanks to bossanova808

Quote from bossanova808

Ok, more experimenting...and I think I have beaten it (or more to the point Ross Nicholson has it cracked, here: 111032 – Need to set gt_min_freq_mhz to max value to avoid sync issues on Gemini Lake N5000/J5005)

It seems this is (still) the problem. The GPU clock speed is not scaling up as it should under load.

With a NUC 2820, I added this `autostart.sh` script:

Bash

(
echo 750 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/gt_min_freq_mhz
) &
nohup script.sh &

The 750 comes from the output of this command (you should check if you have a different NUC)

Bash

cat /sys/bus/pci/devices/0000\:00\:02.0/drm/card0/gt_max_freq_mhz

This results in immediate playback improvement - the stutter is gone from all my 25p stuff.

(I updated the bios to 68, and I am in this test using the 9.2 alpha release but it was only this specific fix that had any impact on the issue).

If I test the GPU (i.e., specifically while playing a hardware decodedc video), with

Bash

cat /sys/bus/pci/devices/0000:00:02.0/drm/card0/gt_cur_freq_mhz

...it now shows 750 during playback (187 during the Kodi GUI still, though, which kinda surprises me but I guess the GPU is idle until playback occurs maybe?)

I shall report back if testing shows any/more issues, but I think that's a solid fix, if anyone is still following along.

Display More

Will do as soon as libreelec get's the update.

I'm assuming it is not a Kodi-problem, i think it is a problem with the libreelec-part (linux).

Maybe some driver changed or is broken for our platform.

Somewhere after Kodi is finished, and bevor the picture get's to the screen, the timing for the frames is messed up...

I just watched a 50fps video, and it has micro stutter, not nearly es bad es with 25fps videos, but it is there.

So i does not have anything to do with frame doubling.

I'm going to install liebreelec 8.2 / Kodi 17.6

druu

that didn't change anything for me and we have the same machine.

What whitelist entries do you have? I don't have an entry for 25Hz or 30Hz.

You are not using an interlaced mode?

@jhshulz

how did you add 25Hz to the whitelist?

jhschulz

I think the stutter with hardware decoding disabled is due to the slow cpu-performance.

It is not a bug and it existed also on the previous versions of libreelec and kodi.

So no reason to complain with hardware decoding disabled.

DaVu

Matching refresh rate is missing 25Hz, 29,97Hz and 30Hz.

Theses are accomplished with framedoubling, so the system uses 50Hz an 60Hz. (nearest match)

and here goes something wrong, wich worked fine in the previous versions of libreelec or kodi.

DaVu

what platform are you using?

i don't have 30fps material, it would be interesting to find out if it also stutters, if so, it should have something to do with framedoubling.

anything new?

Here is a second log, this time i put in

<advancedsettings>
    <loglevel>1</loglevel> <!-- Change this to "1" to hide the on-screen debug log text -->
</advancedsettings>

that means no overlay while video-playback, and my 25fps video stutters.

The feeling is that at least every second frame is not displayed or delayed.

Since displayrefresh rate is 50Hz i can't be shure which of two possibilitys happens.

possibility a) every second frame of the videofile is droped, that means on a 50Hz display refreshrate i get a new picture every 4 frames.

possibility b) the frames are not evenly distributed to be shown every two frames, instead this could be happening:

videoframe 1 is schown on refreshrateframe 1

videoframe 2 is schown on refreshrateframe 2, 3 and 4

videoframe 3 is schown on refreshrateframe 5

videoframe 4 is schown on refreshrateframe 6, 7 and 8

videoframe 5 is schown on refreshrateframe 9

and so on.

I think the log will not provide any answers because while logging with overlay it does not stutter

Here is my log:

All videos (24fps, 30fps and 60fps) are playing fine, only files with 25fps are stuttering since libreelec 9.0

If there are overlays like when skipping back, media info, or if i activate debugging with an overlay in the upper left corner, the stuttering is gone.

Also if i switch to software decoding the stutter is gone.

With libreelec 8.2.5 and older everything works fine.

I'm running libreelec on NUC DN2820FYKH