Ok it's possible to gdb -p [pidofmediaplayer-app] to get:
#0 0xb636a580 in QObject::staticMetaObject () from
/usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#1 0xb0711c34 in QDeclarativeVideoRendererBackend::updatePaintNode
(this=0x8bd328, oldNode=0xad30a070, data=<optimized out>)
at qdeclarativevideooutput_render.cpp:319
#2 0xb69f15ce in QQuickWindowPrivate::updateDirtyNode
(this=this@entry=0x7bd658, item=item@entry=0x868eb0)
at items/qquickwindow.cpp:2985
#3 0xb69f1af4 in QQuickWindowPrivate::updateDirtyNodes
(this=this@entry=0x7bd658) at items/qquickwindow.cpp:2723
#4 0xb69f1c2c in QQuickWindowPrivate::syncSceneGraph
(this=this@entry=0x7bd658) at items/qquickwindow.cpp:341
#5 0xb69d2274 in QSGRenderThread::sync (this=this@entry=0x90bf38,
inExpose=inExpose@entry=false)
at scenegraph/qsgthreadedrenderloop.cpp:512
#6 0xb69d2a64 in QSGRenderThread::syncAndRender (this=this@entry=0x90bf38) at
scenegraph/qsgthreadedrenderloop.cpp:558
#7 0xb69d6776 in QSGRenderThread::run (this=0x90bf38) at
scenegraph/qsgthreadedrenderloop.cpp:674
#8 0xb60a8106 in QThreadPrivate::start (arg=0x90bf38) at
thread/qthread_unix.cpp:331
#9 0xb5df6490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0
That's probably as far as I can get there, and the trace doesn't show
any hints why video playback works for eg thumbnailer + in Youtube but
not in media-player - nothing related to qtvideo-node shown for example,
and the backtrace does not go further back because of corrupt stack.
Any help welcome.
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https://bugs.launchpad.net/bugs/1474695
Title:
Video playback broken with Qt 5.5
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