Attempt to find supported video format before running tests. Tests are skipped if no video format is supported by the system. Change-Id: Iad5b26438b6407f0808e288c5e6184f220f30e36 Reviewed-by: Ling Hu <ling.hu@nokia.com> Reviewed-by: Michael Goddard <michael.goddard@nokia.com> Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>