gscam error - "Failed to PAUSE stream, check your gstreamer configuration." and "Failed to initialize gscam stream!"

edit

Hello,

I tryed to launch a file on my computer that was working fine in another computer on my lab, something like Section 3.

I found some solutions like :

sudo chmod 777 /dev/video0

ll /dev/video*

The device should now have all the permissions:

crwxrwxrwx+ 1 root video 81, 0 Jul 21 18:36 /dev/video0

and I could launch it correctly with:

roslaunch gscam v4l.launch

but it fails, giving me the error:

[FATAL] [1437501492.196615126]: Failed to PAUSE stream, check your gstreamer configuration.
[FATAL] [1437501492.197344548]: Failed to initialize gscam stream!

.

I tryed everything and it just doesn't work.

P.S.: I have Ubuntu 12.04 32bit, ROS Groovy and libgstreamer0.10 if it matters.

. .

My launch file contains exactly this:

<launch>
  <!-- Set this to your camera's name -->
  <arg name="cam_name" value="creative_cam" />

  <!-- Start the GSCAM node -->
  <env name="GSCAM_CONFIG" value="v4l2src device=/dev/video0 ! video/x-raw-yuv,framerate=30/1,width=640,height=480 ! ffmpegcolorspace " />
  <node pkg="gscam" type="gscam" name="$(arg cam_name)">
    <param name="camera_name" value="$(arg cam_name)" />
    <remap from="camera/image_raw" to="$(arg cam_name)/image_raw" />
  </node>

  <!-- View the raw and rectified output -->
  <node pkg="image_view" type="image_view" name="creative_view" >
    <remap from="image" to="/$(arg cam_name)/image_raw" />
  </node>

</launch>

Thank you for your attention ,

Nelson