Problems with GStreamer- video player (with phonon) on embedded Linux (Qt 4.8.4)

[SirToby]

thank your I copied my libs to /usr/local/Trolltech/QtEmbedded-4.8.4/lib but my application still isn't able to find the gstreamer plugin...

[SGaist]

You also have to copy the plugins dir (at least the content that you use)

[SirToby]

thanks but i already copied the complied plugin folder, the folder /usr/local/Trolltech/QtEmbedded-4.8.4/plugin I found on my development PC to my device.

[SGaist]

Just to be sure: did you made a typo here with "plugin" ? Otherwise it's "plugins"

[SirToby]

jep I'm sorry that's a typo, so for examle the libphonon_gstreamer.so is copied at:
/usr/local/Trolltech/QtEmbedded-4.8.4-arm/plugins/phonon_backend

[SGaist]

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

[SirToby]

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

[SGaist]

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) ?

[SirToby]

mh I had release build but i changed to debug (CONFIG += debug) but QT_DEBUG_PLUGINS dosen't work..

[SGaist]

Do you also have the debug lib from Qt on your target ?

[SirToby]

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...

[SGaist]

Did you do a clean build ?

[SirToby]

Yes I did...

[SGaist]

Just to be on the safe side, did you check the output of the configure script to see if it was a debug or release build ?

[SirToby]

If i checked the right file ist says DEBUG=auto, however the libs I compiled with the debug options are pretty big so I think they are build during debug build

[SGaist]

so if you call

@QT_DEBUG_PLUGINS=1 ./myApplication -qws@

You don't have any output ?

[SirToby]

mhh I compiled everthing again und copied all libs und plugins on USB.-now the application aborted.. but may thats because of the USB and not gstreamer??

(process:673): GLib-GObject-WARNING **: cannot register existing type 'gchar'
**
GLib-GObject:ERROR:gvaluetypes.c:457:_g_value_types_init: assertion failed: (type == G_TYPE_CHAR)
Aborted

And thanks again for helping me :)

[SGaist]

It's getting strange...

What do you mean by "because of the USB" ? What do you have exactly there ?

[abifcxm]

SGaist I follow this post and I have a trouble
This is my first time working with phonon and gstreamer module actually Im triying play a simple music file.
I use your args QT_DEBUG_PLUGINS=1 followed of my app and all it works my app is launching but no audio output. When I close the app an error is showed in the terminal

Cannot connect to server socket err= No such file or directory
Cannot connect to server request channel
Jack server is not running or cannot be started

[SGaist]

Hi and welcome to devnet,

Do you have the Jack audio server up and running ?