Netflix is in talks with several U.S. pay-television providers including Comcast and Suddenlink Communications to make its online video service available as an app on their set-top boxes, people familiar with the matter say. A deal would mark the online video service’s first such tie-up with a U.S. cable provider and would come after a similar agreement it recently announced with U.K. cable operator Virgin Media Inc. The talks are in early stages and no deal is imminent, the people cautioned. Netflix and U.S. pay-TV companies are rivals in some key respects. Netflix’s subscription video offering is an attractive alternative for some consumers who are frustrated with costly cable bills. And both sides want to be the go-to destination for consumers to find on-demand TV programming. But that hasn’t stopped Netflix and U.S. operators from exploring partnerships where it makes sense.