docs/random/bbb/subtitles: Add some first mind rumblings on proper subtitle support.
docs/random/bbb/subtitles: Add some first mind rumblings on proper subtitle support.

Original commit message from CVS:
* docs/random/bbb/subtitles:
Add some first mind rumblings on proper subtitle support.

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