General Electric Co. and Comcast Corp have agreed on a valuation of around $30 billion for a joint venture between NBC Universal and Comcast, ironing out what has been a key obstacle in talks so far, a source familiar with the matter said on Sunday.

The resolution of that issue brings the parties one step closer to an agreement, but French media conglomerate Vivendi, which owns 20 percent of NBC Universal, has not yet agreed to a deal, the source said.

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