Posts by gierthi

Ok, some updates.

Setup: RPI4 -> HDMI -> AVR -> HDMI -> TV

Libreelec 9.2.1: The subtitle stutter seems to be gone for me as far as i can see? But maybe i was just lucky with the files i tested.

BUT while h264/h265 (1080p) generally work i get weird "image bugs" regularly on those files now. They consist of:

* Weird tearing for 1 second

* Black screen for 1-2 seconds (while the audio continues fine)

Those "hiccups" happen multiple times (Edit: was an understatement, correct is every 4-5 minutes) in a film/episode and it is getting pretty annoying. I will try to capture the errors in the debug log but last time i tried there were no noticeable entries while these errors happened. That makes it kind of difficult to analyze...

Anyone of you also experiencing this?

Edit2: The hiccups happen exactly every 5 minutes when "adjust framerate" is on (so the movie plays correctly at 24fps)

When i turn that off and force 60fps constantly everything is fine (enough).

Just to avoid confusion for anyone who stumbles onto this thread:

This only applies to the analog/optical audio passthrough!

EAC3/DTS passthrough with HDMI works.

I do not have choppy playback BUT with 1080p+h264 files i get like 1 second image errors (black screen and audio continues or weird flashing artifacts) like 2-3 times in a film/tv episode. This got worse with the newest update.

1080p+hevc does NOT have any of that problems for me. Maybe there is a specific problem now with h264/avc files?

Edit: Ok, i was wrong. Since this latest update this is true for every file.

I even think there is a codec difference:

* EAC3,AC3 with 5.1 work (at least all that i tested)

* DTS works sometimes. But all my files that stutter are also DTS 5.1

So once again, the same for me. But the audio workarounds do not work for me with the files i tested.

Some files just work and others get the frame skipping but i do not really see a difference between the files themself.

Quote from nvdias

I’m running LibreELEC-RPi4.arm-9.1.501 in my Rpi 4.

I’ve also noticed that some video does not play smoothly. There is judder, jerkyness and stuttering (lost frames?) - The odd thing is that no report whatsoever in kodi.log – the result is very unpleasant to watch.

It happens with 23.976fps material and also live-tv @25fps.

In the first case kodi switches the tv to 23.976fps in the second one to 50fps (as it should be).

Kodi.log reports the correct fps switching.

But Looking to the video playback there’s a lot of strange motion artifacts, as if kodi is processing output to another fps different from the one it is outputting.

I have configured “Adjust Display Refresh Rate” as “start/top”.

TURN AROUNDS:

a)     In version LibreELEC-RPi4.arm-9.1.501 this seems to happen only if I have audio with “Allow Pass Trough” enabled. Disabling it, the video runs fine!

b)     In version LibreELEC-RPi4.arm-9.1.002, I found a turn around by forcing “Adjust Display Refresh Rate” as “always”.

My TV is a SONY Android TV from 2016.

Note: I also have a RPi 3, with same configurations, in which all goes very smoothly.

Hope this can be fixed in the next releases.

Keep up the great work supporting the Pi 4

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That's what i also experience. But diisabling audio passthrough does nothing for me.

The weird thing is that it works completely fine with some h264/h265 1080p(23.976/24fps) files and stutters/skips visibly with others. It was already discussed at the end of the the last announcement post. And i also find nothing in the logs.

That is also why i couldn't produce helpful logs yet. I get obvious frame drops but the logs do not show them at all.

Thanks, but i tried that already and it did nothing noticeable.

I will also try to produce some helpful logs.

Anyone else having playback issues with the pi4 (1080p, h264/h265, adjust refresh rate on start/stop)?

Some files play without problem, but i have also encountered dropped frames every few seconds in some files. It is quite noticable. I started watching my h264 encode of Gladiator and it stutters every 2-3 seconds (so it drops some frames)

I also get the infamous "drop frames before first appearance of srt subtitles" in a lot of files. This happens every time a new block of subtitles appears after some time without dialog.

Are that known issues?