basetransform: If suggested caps are not compatible with upstream try to come up with compatible caps
basetransform: If suggested caps are not compatible with upstream try to come up with compatible caps

Fixes bug #662199.

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