[Bug 1140434] New: Reduced video quality in vlc/kaffeine since 5.1.10
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@opensuse.org Reporter: Michael.Zapf@mizapf.de QA Contact: qa-bugs@suse.de 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. -- You are receiving this mail because: You are on the CC list for the bug.
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--- Comment #1 from Michael Zapf
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Wolfgang Bauer
This effect seems to be caused by the VDPAU setting in VLC. When using VLC and I set the output to XCB, the resolution is back at is intended level. I suppose it's not a kaffeine or vlc problem then... (vlc is not a KDE application anyway)
There should be a way to pass this argument from kaffeine to the libVLC, but I have not found a way to do this; any setting for --vout or -V seems to be ignored. Look at /usr/share/doc/packages/kaffeine/README.md (in particular the sections "Changing the libVLC output plugin" and "Setting VDPAU acceleration").
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--- Comment #3 from Wolfgang Bauer
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--- Comment #4 from Michael Zapf
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--- Comment #5 from Michael Zapf
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Stefan Dirsch
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--- Comment #7 from Michael Zapf
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--- Comment #8 from Stefan Dirsch
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--- Comment #10 from Stefan Dirsch
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--- Comment #11 from Michael Zapf
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Stefan Dirsch
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--- Comment #13 from Michael Zapf
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--- Comment #15 from Michael Zapf
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--- Comment #16 from Stefan Dirsch
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--- Comment #17 from Michael Zapf
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Stefan Dirsch
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--- Comment #35 from Michael Zapf
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--- Comment #36 from Stefan Dirsch
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--- Comment #37 from Michael Zapf
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Peter B
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--- Comment #38 from Michael Zapf
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Stefan Dirsch
However, I cannot compare the current CPU loads to the numbers shown here, since I upgraded my system a short while ago (new CPU > and new graphics card).
As you wish. ;-) -- You are receiving this mail because: You are on the CC list for the bug.
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