Two of the world’s largest cable TV companies have begun the transition to include rival OTT services as part of their own offerings – steps towards embracing OTT which could be considered even braver than the recent plunge to carry Netflix. This week, Liberty Global’s UPC DTH has extended its deal with SPI International/Filmbox and Comcast has announced the launch of Sling TV on its X1 line of set tops. Liberty’s deal with global media firm SPI International will provide subscribers to the UPC Direct and freeSat offerings in the Czech Republic, Slovakia and Hungary with a new online service, Filmbox Live – allowing users to stream live and on-demand content on multiple devices. Liberty Global is dramatically changing its…