manual: update for position/duration query API change
manual: update for position/duration query API change

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