Hello! 

> /home/user # gst-launch v4l2src ! xvimagesink
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> ERROR: from element /pipeline0/v4l2src0: Device '/dev/video0' cannot capture
> at 800x480
> Additional debug info:
> v4l2src_calls.c(929): gst_v4l2src_set_capture (): /pipeline0/v4l2src0:
> Tried to capture at 800x480, but device returned size 640x480
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> FREEING pipeline ...

> How can I fix the resolution?

See: 
http://maemo.org/development/documentation/how-tos/4-x/how_to_use_camera_api 
.html 

You would have to pass corresponding capability information regarding the
requested capture size to gst-launch.... 

-- 
Gruß...
      Tim. 
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