Problems with GStreamer- video player (with phonon) on embedded Linux (Qt 4.8.4)
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Hey,
First of all English isn't my mother language, so sorry if my English isn't perfect.
I tried to develop a videoplayer for an ARM device (works with embedded linux). But I have some problems with GStreamer. I don't know exactly how to install the GStreamer on the ARM device. My steps so far:
- I crosscompiled the libraries for phonon (see http://qt-project.org/faq/answer/how_can_i_cross_compile_qt_embedded_with_phonon_support ).
- I crosscompild Qt 4.8.4 embedded Qt for arm (also with phonon, glib etc. ).
- I installed the nessasary Qt libraries on my ARM device (projects without phonon haven*t any problems).
- I installed all crosscompiled Qt plugins.
- I wrote (I’m using QtCreator) the videoplayer (works on ubuntu) and crosscompild the project.
- I didn’t' installed all crosscompiled Phonon libraries (not enough space on my arm device).
- But I installed the libraries (same path they are on my development system (ubuntu)) libffi and libgstreamer-0.10, because they were needed during crosscompilation of my application.
Is there a possibility to crosscompiled my application with all dependency ( static ? ); so there is no need to install all phonon libraries on my arm device?
Or has someone any other idea?Thank you all
error:
"Warning: You do not seem to have the base GStreamer plugins installed. All audio and video support has been disabled"
Phonon::GStreamer::Backend: Failed to initialize GStreamer
GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed
GStreamer-CRITICAL **: gst_object_sink: assertion 'GST_IS_OBJECT (object)' failed
[...]
WARNING: Phonon::createPath: Cannot connect Phonon::MediaObject ( no objectName ) to Phonon::VideoWidget ( VideoWidget ). -
Hi and welcome to devnet,
If your device can boot on the network you could use a NFS as root filesystem. That will give you enough space for you current development.
In a second phase you can build Qt statically but beware of the licensing issues. You can also copy only the Qt libraries you are using i.e. if you don't make use of Sql you can avoid install it.
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Thank you very much
I checked with ldd and all the libraries are linked - thats fine. I copied all nessasrry Qt libs too.
But right now I am not sure if the gstreamer plugin ( libphonon_gstreamer.so) can find or has all needed libraries - during compilation I had to include libffi.a and libgstreamer-0.10.a but I installed them on the device at the same path like on my developsystem. Any Idea how I can check that or where I have to install them- As mentioned I can't install all libs I crosscompiled for the phonon framework on the device
Thanks again
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You can try to run ldd on the plugins/libraries on your device to see if something is missing
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Thanks again
But I didn't solve my problem yet.
I tried ldd on my plugin ( libphonon_gstreamer.so): look okay right? libphonon.so.4 => /lib/libphonon.so.4 (0x4036c000)
libQtGui.so.4 => /lib/libQtGui.so.4 (0x403bb000)
libQtNetwork.so.4 => /lib/libQtNetwork.so.4 (0x40d05000)
libQtCore.so.4 => /lib/libQtCore.so.4 (0x40dfb000)
libpthread.so.0 => /lib/libpthread.so.0 (0x41150000)
libstdc++.so.6 => /lib/libstdc++.so.6 (0x41172000)
libm.so.6 => /lib/libm.so.6 (0x41244000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x412e7000)
libc.so.6 => /lib/libc.so.6 (0x41310000)
libdl.so.2 => /lib/libdl.so.2 (0x4144d000)
librt.so.1 => /lib/librt.so.1 (0x4145b000)
/lib/ld-linux.so.3 (0x2a000000)Btw in included the plugin, libffi and libgstreamer-0.10 like this , is that okay?
LIBS += -L/usr/local/Trolltech/QtEmbedded-4.8.4-arm/plugins/phonon_backend/ -lphonon_gstreamer
LIBS += -L/opt/x/lib/ -lffi -lgstreamer-0.10 -lgstbase-0.10
I also included after i read shrikantds post libgstbase (good and bad are optional for the gstreamer aren't they?) but sadly nothing...
I am really sorry I didn't figured it out yet...
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You should rather have copied your QtEmbedded in the same folders on your arm device (libs and plugins and fonts). Meaning in /usr/local/Trolltech/QtEmbbeded-4.8.4.
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You also have to copy the plugins dir (at least the content that you use)
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Just to be sure: did you made a typo here with "plugin" ? Otherwise it's "plugins"
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Ok, then next step:
set this
@QT_DEBUG_PLUGINS=1@
on your command line before starting your application, that should give you the plugin loading error -
First of all thank you very much for your help SGaist, that's really great and very nice :)
But I tried export QT_DEBUG_PLUGINS=1 befor starting my application, but nothing special happens (i also tried on my deveopment system, nothing, too)
QT_DEBUG_PLUGINS=1
./phon -qws
If I check that enviroment variable, it's set ...
echo $QT_DEBUG_PLUGINS
1 -
Are you running a debug or release build of your application (Right now i'm not sure whether this could change the output when using QT_DEBUG_PLUGIN) ?
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Do you also have the debug lib from Qt on your target ?
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I wan't in town yesterday so I couldn't test that yesterday - sorry for that
I'm sorry but I can't find the debug lib...I crosscompild my Qt again and added the option - debug... but no debug lib was created- and also with the libs I compiled with the debug options, the QT_DEBUG_PLUGINS dosn't work
BTW I also set the PluginPath with QT_PLUGIN_PATH=... but that wasn't successful neither.
Also included: qDebug()<<QLibraryInfo::location(QLibraryInfo::PluginsPath);
It shows the correct Path("/usr/local/Trolltech/QtEmbedded-4.8.4-arm/plugins"
), where the plugin is installed...
