WASHINGTON – The head of the Federal Communications Commission proposed regulatory conditions Thursday to ensure that cable giant Comcast Corp. cannot stifle video competition once it takes control of NBC Universal.

The conditions are intended to guarantee that satellite companies, phone companies and other traditional subscription television services can still get access to marquee NBC programming once the transaction closes. FCC Chairman Julius Genachowski also wants to ensure that new Internet video distributors can get the programming they need to grow and compete.

FCC officials, however, wouldn’t disclose the specific conditions Thursday as fellow commissioners consider whether to back Genachowski’s proposal. The chairman needs the support of at least two of them to get the plan passed. He is likely to modify parts of his proposal to win the backing he needs.

Comcast is seeking government approval to buy a 51 percent stake in NBC Universal from General Electric Co. for $13.8 billion in cash and assets. The deal would create a media powerhouse that both produces and distributes content.

The deal is also still awaiting approval by the Justice Department, which will attach its own conditions. Those are likely to be similar to the final conditions imposed by the FCC.

Approval with conditions is expected early next year.

The combination would give the nation’s largest cable TV company control over the NBC and Telemundo broadcast networks; 26 local TV stations; popular cable channels including CNBC, Bravo and Oxygen; the Universal Pictures movie studio and theme parks; and a stake in Hulu.com, which distributes NBC and other broadcast programming online.

Comcast already owns a handful of cable channels, including E! Entertainment, Versus and the Golf Channel. It also has a controlling interest in the Philadelphia 76ers and Flyers.