Bug 486707

Summary:	Playing videos on a Pixel 3A fails, failure to open VDPAU backend
Product:	[Applications] PlasmaTube	Reporter:	Bart Ribbers <bribbers>
Component:	general	Assignee:	Linus Jahn <lnj>
Status:	CONFIRMED ---
Severity:	normal	CC:	bugzilla, espidev, josh
Priority:	NOR
Version First Reported In:	24.01.80
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Bart Ribbers 2024-05-07 08:45:16 UTC

I'm using Plasmatube on a Pixel 3A running postmarketOS with Plasma Mobile on a 6.8 kernel.
It is however currently unable to play any video. A separate window opens up showing the first frame of a video but it's frozen (no playback controls).
In the console the following is logged:

Failed to open VDPAU backend Error loading shared library libvdpau_nvidia.so: No such file or directory
[ffmpeg] AVHWDeviceContext: VDPAU device creation on X11 display :0 failed.
Failed to open VDPAU backend Error loading shared library libvdpau_nvidia.so: No such file or directory
[ffmpeg] AVHWDeviceContext: VDPAU device creation on X11 display :0 failed.

This device uses an Adreno GPU with Mesa's Freedreno, so I'm unsure why it's trying to get a NVIDIA library in the first place.

Comment 1 Luca Weiss 2024-07-05 15:35:08 UTC

Can confirm on Fairphone 4 phone (Qualcomm SM7225), also postmarketOS.

Comment 2 Luca Weiss 2024-07-05 15:50:28 UTC

I was digging a bit and from https://invent.kde.org/multimedia/plasmatube/-/blob/v24.05.2/src/utils/mpvobject.cpp?ref_type=tags#L18 I was trying "mpv --hwdec=auto-safe bigbucksbunny.mov" and that prints similar messages but the video still plays, so these vdpau messages can probably be ignored.

    Failed to open VDPAU backend Error loading shared library libvdpau_nvidia.so: No such file or directory
    [ffmpeg] AVHWDeviceContext: VDPAU device creation on X11 display :0 failed.

(minus any typos, I copied these messages manually)

Comment 3 Bart Ribbers 2024-08-30 18:20:22 UTC

It seems this is not actually the cause of the video not playing. If you disable hardware acceleration by commenting out line 18 in src/utils/mpvobject.cpp the error disappears, but still no video plays.

A log with that line commented out and failing to play video:

org.kde.plasmatube: Loading source "{24ee1339-b49b-4f42-81f6-c8dd0be1d68b}"
org.kde.plasmatube: Loading source "{bb131e8c-ead5-42ab-9222-3ba6691e6f2a}"
kf.purpose.externalprocess: Cannot initialize model for plugin type "ShareUrl" with data QJsonObject(): missing key "urls"
qrc:/qt/qml/org/kde/kirigami/dialogs/Dialog.qml:401:33: QML Binding: Binding loop detected for property "value"
qrc:/qt/qml/org/kde/kirigami/dialogs/Dialog.qml:344:18: QML ScrollView: Binding loop detected for property "implicitHeight"
kf.purpose.externalprocess: Cannot initialize model for plugin type "ShareUrl" with data QJsonObject(): missing key "urls"
kf.purpose.externalprocess: Cannot initialize model for plugin type "ShareUrl" with data QJsonObject(): missing key "urls"
qrc:/qt/qml/org/kde/plasmatube/ui/TrendingPage.qml:10:1: QML TrendingPage: Created graphical object was not placed in the graphics scene.
Not trying to load comments for an empty video id.
[file] Cannot open file '': No such file or directory
Failed to open .
qrc:/qt/qml/org/kde/plasmatube/ui/components/VideoListItem.qml:57:9: QML QQuickImage: Cannot open: qrc:/qt/qml/org/kde/plasmatube/ui/components/api.youtube.fam-ribbers.com