https://bugs.kde.org/show_bug.cgi?id=525050
Bug ID: 525050
Summary: h264vaapiencoder: only attach DRM hardware context to
input filter
Classification: Frameworks and Libraries
Product: KPipeWire
Version First 6.7.4
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 195642
--> https://bugs.kde.org/attachment.cgi?id=195642&action=edit
Fix VAAPI filter context overwrite in H264VAAPIEncoder::initialize
DESCRIPTION
When attempting to stream or record video using the h264_vaapi hardware encoder
in KPipeWire (such as with krdpserver or Spectacle on Wayland), frame filtering
fails immediately on the first frame with:
"Failed receiving filtered frame: Input/output error" followed by the filter
queue filling up and dropping all subsequent frames.
STEPS TO REPRODUCE
1. Start KRDP server or KPipeWire recording on a Wayland session with Intel
VAAPI hardware: KPIPEWIRE_FORCE_ENCODER=h264_vaapi krdpserver
2. Connect to the session via an RDP client (e.g. FreeRDP / Microsoft Remote
Desktop).
3. Observe the terminal output / journal logs.
OBSERVED RESULT
Encoding fails with Input/output error on the first frame:
krdpserver: Failed receiving filtered frame: Input/output error
krdpserver: Filter queue is full, dropping frame 132647399
EXPECTED RESULT
Frames should be encoded cleanly through the VAAPI hardware filter pipeline
without I/O errors or frame drops.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux (Linux x86_64)
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
ADDITIONAL INFORMATION
Fix: Only assign m_drmContext to m_inputFilter, allowing
hwmap=mode=direct:derive_device=vaapi to properly propagate the derived
AV_HWDEVICE_TYPE_VAAPI context downstream:
--- a/src/h264vaapiencoder.cpp
+++ b/src/h264vaapiencoder.cpp
@@ -106,9 +106,7 @@ bool H264VAAPIEncoder::initialize(const QSize &size)
return false;
}
- for (auto i = 0u; i < m_avFilterGraph->nb_filters; ++i) {
- m_avFilterGraph->filters[i]->hw_device_ctx =
av_buffer_ref(m_drmContext);
- }
+ m_inputFilter->hw_device_ctx = av_buffer_ref(m_drmContext);
ret = avfilter_graph_config(m_avFilterGraph, nullptr);
if (ret < 0) {
--
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