https://bugs.kde.org/show_bug.cgi?id=526820
Bug ID: 526820
Summary: libx264 encoder signals H.264 level 6.2 (time_base
1/1000, no framerate), so hardware decoders reject the
stream
Classification: Frameworks and Libraries
Product: KPipeWire
Version First 6.7.91
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 196956
--> https://bugs.kde.org/attachment.cgi?id=196956&action=edit
src/libx264encoder.cpp patch
Disclosure: patch and text drafted with an AI assistant; testing and
verification done by me.
System: MX Linux 25.3 KDE (Debian 13 trixie base; not in the OS list), kernel
7.2.8-2-liquorix-amd64, Plasma 6.3.6, NVIDIA GTX 1080 Ti (libx264 software
encoding).
LibX264Encoder::initialize() sets time_base = 1/1000 and no framerate, so x264
assumes 1000 fps and picks level 6.2 for a 4K desktop:
[libx264] MB rate (32400000) > level limit (16711680)
[libx264] profile Constrained Baseline, level 6.2
Windows' Remote Desktop client (mstsc, hardware decoding) rejects this. With
krdp it shows "protocol error" and disconnects.
Setting a nominal framerate (60) and level 5.1 fixes it: GPU decoding works and
the error is gone. Tested on 6.3.6; the patch against master is attached but
hasn't been built.
Moved here from bug 526199 (filed under the wrong product).
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