Jerky video playback

[Volker Wysk]

Am Mittwoch, dem 14.06.2023 um 16:09 +0200 schrieb Oliver Grawert:
> hi,
> Am Mittwoch, dem 14.06.2023 um 15:01 +0200 schrieb Volker Wysk:
> > Hi!
> > 
> > I have a problem with my machine. When I play a video, it often
> > occurs that
> > the playback is jerky. It's hard to reproduce. When I stop it for a
> > few
> > seconds, it runs smoothly for a while. The same happens when I "cat"
> > it to
> > /dev/null.
> > 
> > I'm using SMPlayer most of the time. When I tried VLC with a jerky
> > video
> > lately, the video track became smooth. But the audio track became
> > jerky
> > instead.
> > 
> > I have a standard PC, which is about three years old. It has 16 GB of
> > memory
> > and an "AMD Ryzen 7 2700X Eight-Core Processor" CPU. The videos are
> > on an
> > internal hard disk drive (the spinning kind). The main system is on
> > an SSD.
> > 
> which ubuntu release is this and what kernel/HWE stack do you have
> installed on it ... 
>
> especially for AMD it makes sense to always have the latest HWE stack
> for kernel/graphics drivers and particuary for your problem VAAPI libs
> installed.

It's Ubuntu 22.04.2 LTS.

I've googled a bit about HWE stack. I found this:
https://www.thomas-krenn.com/de/wiki/Ubuntu_LTS_Hardware_Enablement_Stack

I've always just done an "apt full-upgrade". I've never cared about HWE
stacks and HWE kernels... This seems to list what's installed:

desktop ~ $ apt list --installed '*linux-image*'
Auflistung… Fertig
linux-image-5.19.0-42-generic/jammy-updates,jammy-security,now 5.19.0-
42.43~22.04.1 amd64  [Installiert,automatisch]
linux-image-5.19.0-43-generic/jammy-updates,jammy-security,now 5.19.0-
43.44~22.04.1 amd64  [Installiert,automatisch]
linux-image-generic-hwe-22.04/jammy-updates,jammy-security,now
5.19.0.43.44~22.04.17 amd64  [Installiert,automatisch]

desktop ~ $ apt list --installed '*linux-generic-hwe*' -a
Auflistung… Fertig
linux-generic-hwe-22.04/jammy-updates,jammy-security,now
5.19.0.43.44~22.04.17 amd64  [installiert]
linux-generic-hwe-22.04/jammy 5.15.0.25.27 amd64

Now, do I have a HWE kernel or a GA kernel..?


> the video player might simply not use HW deoding with the VAAPI
> packages you have installed and fall back to CPU based decoding.

Okay


Volker
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