examples: set bus handler before state change
examples: set bus handler before state change

We need to set the bus handler before starting the pipeline or we might just
miss the message we are looking for.

jpxiong/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,collects/gstreamer,drothlis/gstreamer,collects/gstreamer,krieger-od/gstreamer,drothlis/gstreamer,collects/gstreamer,magcius/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,centricular/gstreamer,mparis/gstreamer,mrchapp/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,krichter722/gstreamer,krichter722/gstreamer,mrchapp/gstreamer,surround-io/gstreamer,ahmedammar/platform_external_gst_gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,drothlis/gstreamer,krieger-od/gstreamer,collects/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,surround-io/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,Distrotech/gstreamer,mparis/gstreamer,centricular/gstreamer,magcius/gstreamer,justinjoy/gstreamer,magcius/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,lubosz/gstreamer,surround-io/gstreamer,ylatuya/gstreamer,krichter722/gstreamer,ylatuya/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,centricular/gstreamer,magcius/gstreamer,centricular/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,drothlis/gstreamer,krichter722/gstreamer,lubosz/gstreamer,cfoch/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,krieger-od/gstreamer,jpakkane/gstreamer,mparis/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,StreamUtils/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,ahmedammar/platform_external_gst_gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,magcius/gstreamer,cfoch/gstreamer,ylatuya/gstreamer,lovebug356/gstreamer,drothlis/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,mparis/gstreamer,collects/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,cablelabs/gstreamer,cfoch/gstreamer,ylatuya/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,centricular/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,lubosz/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,mparis/gstreamer,jpakkane/gstreamer