Patent ID: 7995576

Claim:
In a network, a method comprising: transmitting, by a first source, a first multicast stream to a first group of receivers and transmitting, by a second source, a second multicast stream to a second group of receivers; generating, using the first source, a preview multicast stream from the first multicast stream and the second multicast stream, wherein the preview multicast stream includes interleaved frames from the first multicast stream and the second multicast stream, the interleaved frames from the first multicast stream providing pre-recorded content from the first multicast stream and the interleaved frames from the second multicast stream providing pre-recorded content from the second multicast stream, the preview multicast stream being in a predefined frame format, and wherein the pre-recorded content comprises content that was recorded during a predefined recording-time period; and transmitting, by the first source, the preview multicast stream to a third group of receivers at a same time the first source is transmitting the first multicast stream to the first group of receivers.