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[Bug 1140434] New: Reduced video quality in vlc/kaffeine since 5.1.10
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Thu, 04 Jul 2019 22:37:28 +0000
  • Message-id: <bug-1140434-21960@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1140434


Bug ID: 1140434
Summary: Reduced video quality in vlc/kaffeine since 5.1.10
Classification: openSUSE
Product: openSUSE Tumbleweed
Version: Current
Hardware: x86-64
OS: openSUSE Factory
Status: NEW
Severity: Normal
Priority: P5 - None
Component: KDE Applications
Assignee: opensuse-kde-bugs@xxxxxxxxxxxx
Reporter: Michael.Zapf@xxxxxxxxx
QA Contact: qa-bugs@xxxxxxx
Found By: ---
Blocker: ---

After the upgrade to 5.1.10, the video quality in VLC and kaffeine (using the
vlclib) has significantly degraded. It seems as if the vertical resolution has
been reduced to 50%, then stretched to fill the frame.

vlc was not updated (3.0.7.1 "Vetinari"), so I suspect that the different
behavior comes from the kernel update.

Here are links that show screenshots I created on the openSUSE KDE Plasma
desktop. In both cases, the same program was being shown; I reverted to the
previous kernel in the meantime using "start with read-only snapshot".

Have a closer look at the TV station logo in the upper left corner to spot the
difference most easily.

With kernel 5.1.7: http://www.mizapf.eu/files/vlc_5.1.7.png
With kernel 5.1.10: http://www.mizapf.eu/files/vlc_5.1.10.png

Here is one final screenshot that shows another point of different behavior.
When vlc is started, the video output is only half-height for about 1 second or
slightly less. Then, the video is stretched to the window height. I created
this snapshot by launching VLC and then quickly creating a screenshot.

http://www.mizapf.eu/files/vlc_5.1.10_sec1.png

I just updated to the newest release 5.1.15, but the reduced quality is still
there.

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