caps: ensure writable caps prior to modification
caps: ensure writable caps prior to modification

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