Qt 5.4.0 - QtMultimedia Camera Example not working on BeagleBone Black

njozwiak

Hi all,

I have a BeagleBone Black I am running Linux 3.8.13 with gstreamer-0.10.36 and Qt 5.4.0. I am trying to get the sample camera application from qt-everywhere-opensource-src/5.4.0/qtmultimedia/examples running. I had no errors cross-building but when I run the application on the board I get the following errors:

beaglebone:~# ./camera -platform linuxfb -plugin evdevtouch:/dev/input/touchscreen0
** (camera:239): CRITICAL **: gst_photography_set_focus_mode: assertion 'photo != NULL' failed
This plugin does not support setParent!
(camera:239): GStreamer-CRITICAL **: gst_caps_unref: assertion 'caps != NULL' failed
** (camera:239): CRITICAL **: gst_missing_encoder_message_new: assertion '!gst_caps_is_any (encode_caps)' failed
(camera:239): GStreamer-CRITICAL **: gst_element_post_message: assertion 'message != NULL' failed
CameraBin error: "Your GStreamer installation is missing a plug-in."

I have validated the camera using Gstreamer pipelines (using v4l2src and fbdevsink to sink to the display). So I know the camera is working.

I have built in almost all plugins from Gstreamer base/good/bad:

beaglebone:~# gst-inspect-0.10
...
Total count: 181 plugins (1 blacklist entry not shown), 1028 features

And validated the camerabin plugins are there from plugins-bad:

beaglebone:~# gst-inspect-0.10 | grep camera
camerabin2:  viewfinderbin: Viewfinder Bin
camerabin2:  wrappercamerabinsrc: V4l2 camera src element for camerabin
camerabin2:  camerabin2: CameraBin2
camerabin:  camerabin: Camera Bin
bayer:  bayer2rgb: Bayer to RGB decoder for cameras

The only blacklist plugin is the vorbisdec plugin due to a conflict in the GstVorbisDec class set by the vorbis and tremor plugins (http://lists.freedesktop.org/archives/gstreamer-bugs/2012-April/089483.html). That should not be relevant to this error though.

I have also validated that the photography library exists and there are no missing dependencies:

beaglebone:/usr/lib# ll libgstphoto*
-rwxr-xr-x 1 root root  1383 Mar 12 19:42 libgstphotography-0.10.la
lrwxrwxrwx 1 root root    32 Mar 12 19:42 libgstphotography-0.10.so -> libgstphotography-0.10.so.23.0.0
lrwxrwxrwx 1 root root    32 Mar 12 19:42 libgstphotography-0.10.so.23 -> libgstphotography-0.10.so.23.0.0
-rwxr-xr-x 1 root root 20028 Mar 12 19:42 libgstphotography-0.10.so.23.0.0

beaglebone:/usr/lib# ldd libgstphotography-0.10.so
    libgstreamer-0.10.so.0 => /usr/lib/libgstreamer-0.10.so.0 (0xb6e29000)
    libgobject-2.0.so.0 => /usr/lib/libgobject-2.0.so.0 (0xb6ddc000)
    libffi.so.6 => /usr/lib/libffi.so.6 (0xb6dcf000)
    libgmodule-2.0.so.0 => /usr/lib/libgmodule-2.0.so.0 (0xb6dc3000)
    libgthread-2.0.so.0 => /usr/lib/libgthread-2.0.so.0 (0xb6dba000)
    libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0xb6ca4000)
    libpthread.so.0 => /lib/libpthread.so.0 (0xb6c84000)
    libxml2.so.2 => /usr/lib/libxml2.so.2 (0xb6bb0000)
    libdl.so.2 => /lib/libdl.so.2 (0xb6ba4000)
    libz.so.1 => /lib/libz.so.1 (0xb6b8d000)
    libm.so.6 => /lib/libm.so.6 (0xb6b1b000)
    libc.so.6 => /lib/libc.so.6 (0xb69e3000)
    libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb69ca000)
    /lib/ld-linux-armhf.so.3 (0xb6ee6000)

Any ideas?

Thanks