https://bugs.kde.org/show_bug.cgi?id=470826

GoldBarb <q9hc2...@duck.com> changed:

           What    |Removed                     |Added
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                 CC|                            |q9hc2...@duck.com

--- Comment #12 from GoldBarb <q9hc2...@duck.com> ---
Fedora 41
KWin version: 6.2.4
Qt compile version: 6.8.0

Launching systemsettings kcm_kwin_effects then opening a preview of an effect
results in the following error message.

[ogg @ 0x7f2824001600] Broken file, keyframe not correctly marked.

A quick look at the src code shows the kwin effect demo videos are served over
on https://files.kde.org/plasma/kwin/effect-videos/

Using mpv https://files.kde.org/plasma/kwin/effect-videos/fade_desktop.ogv 
lets you play the video, but throws the same error message.

Further logging.

export QT_FFMPEG_DEBUG=1
systemsettings kcm_kwin_effects

qml: Pushed pages do not conform to the rules. Please check the documentation.
"FFmpeg log: Starting connection attempt to 49.12.122.15 port 443"
"FFmpeg log: Successfully connected to 49.12.122.15 port 443"
"FFmpeg log: Starting connection attempt to 46.37.189.155 port 443"
"FFmpeg log: Successfully connected to 46.37.189.155 port 443"
"FFmpeg log: Starting connection attempt to 49.12.122.15 port 443"
"FFmpeg log: Successfully connected to 49.12.122.15 port 443"
"FFmpeg log: Starting connection attempt to 46.37.189.155 port 443"
"FFmpeg log: Successfully connected to 46.37.189.155 port 443"
"FFmpeg log: Starting connection attempt to 49.12.122.15 port 443"
"FFmpeg log: Successfully connected to 49.12.122.15 port 443"
"FFmpeg log: Starting connection attempt to 46.37.189.155 port 443"
"FFmpeg log: Successfully connected to 46.37.189.155 port 443"
"FFmpeg log: Starting connection attempt to 49.12.122.15 port 443"
"FFmpeg log: Successfully connected to 49.12.122.15 port 443"
"FFmpeg log: Starting connection attempt to 46.37.189.155 port 443"
"FFmpeg log: Successfully connected to 46.37.189.155 port 443"
"FFmpeg log: Starting connection attempt to 49.12.122.15 port 443"
"FFmpeg log: Successfully connected to 49.12.122.15 port 443"
"FFmpeg log: Starting connection attempt to 46.37.189.155 port 443"
"FFmpeg log: Successfully connected to 46.37.189.155 port 443"
"FFmpeg log: Broken file, keyframe not correctly marked."
"FFmpeg log: Statistics: 294426 bytes read, 4 seeks"

Is this a FFmpeg decoding issue ?

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