“We feel that we’re in a good place,” said Russ Schriefer, a top media strategist for Mr. Romney and a central planner for the convention. “We know that not everybody is going to agree with us at all times.” In the film about Mr. Paul, he said, “Several of his colleagues will give testimony to his principles and his dedication to America.”

Mr. Schriefer said that while Mr. Romney and Mr. Paul “certainly disagree on many issues,” the onetime rivals had “a lot of mutual respect.” In addition to the video, Senator Rand Paul of Kentucky, Mr. Paul’s son, will address the convention on Monday.

Republicans also confirmed Friday that Ann Romney’s convention speech was moving to Tuesday night after the party failed to persuade the broadcast networks to televise any of the Monday convention speeches.

Mr. Schriefer had said Friday morning that convention officials were still optimistic that the networks would change their minds. But by the end of the day, Mr. Romney’s camp gave in and agreed to move his wife’s speech so that she would receive some prime-time coverage.

Republican officials also described the themes they hoped to offer during the convention.

Speakers on Monday will hammer President Obama as a “failure” as they try to drive home the theme that “we can do better.” Mr. Schriefer said the speeches would not be overly negative, but promised to draw a sharp contrast between Mr. Romney and the president.

“You need to lay down the predicate and make the case of why President Obama has failed and why this administration has failed on many levels,” Mr. Schriefer said. He said the speakers would “talk about the areas where President Obama hasn’t lived up to his many promises.”