System and method of managing video content streams

• US 9,178,743 B2
• Filed: 09/23/2011
• Issued: 11/03/2015
• Est. Priority Date: 05/27/2005
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Nadarajah, Dinesh
• Primary Examiner(s): Chung, Hoon J
• Application Number:
  US13/242,062
• Publication Number:
  US 20120017255A1
• Time in Patent Office: 1,502 Days
• Field of Search: 370217-221, 370242-244, 370/390, 370/432, 714/4.2, 714/4.3, 714/13, 725/38, 725/57, 725/59, 725/87, 725/93, 725/94, 725/97, 725/104, 725/115, 725/139, 725/146, 725/151
• US Class Current: 1/1
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/765 intermediate
• CPC Class Codes: H04N 21/26616 for merging a unicast channel into a multicast channel, e.g. in a VOD application, when a client served by unicast channel catches up a multicast channel to save bandwidth data multicast over packet-switching network H04L12/18
• CPC Class Codes: H04N 21/4384 involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/6408 Unicasting
• CPC Class Codes: H04N 7/17318 Direct or substantially direct transmission and handling of requests

Abstract

A method includes buffering a plurality of video streams within a buffer of a video server and generating a unicast video output and a multicast video output at the buffer.

Claims

1. A method comprising:

buffering a plurality of video streams within a plurality of buffers of a video server, wherein the video streams correspond to channels;

generating, via a buffer of the plurality of buffers, a unicast video output for a particular channel and a multicast video output for the particular channel;

receiving a request for the particular channel of the channels at the video server from a set top box;

joining the set top box to a multicast group associated with the particular channel;

sending the unicast video output for the particular channel from the video server to the set top box via a plurality of data packets until a determination by the video server indicates that the set top box joined the multicast group; and

sending the multicast video output for the particular channel to the set top box when the determination by the video server indicates that the set top box joined the multicast group.

2. The method of claim 1, wherein digital rights management is applied to the video stream corresponding to the particular channel.

3. The method of claim 1, wherein the set top box is joined to a first channel multicast group prior to receiving the request and wherein the video server sends first channel multicast video output associated with the first channel multicast group to the set top box prior to the request.

4. The method of claim 1, further comprising sending the multicast video output to a plurality of set top boxes.

5. The method of claim 1, wherein the plurality of video streams is received via multicast from an acquisition server coupled to the video server through a network.

6. The method of claim 1, wherein the buffer comprises a fast channel change buffer operative to receive and buffer a video input and wherein the fast channel change buffer is operative to provide the multicast video output.

7. The method of claim 6, wherein the fast channel change buffer includes a multicast replication point operative to provide the multicast video output associated with the multicast group to a plurality of set top boxes including the set top box.

8. The method of claim 7, wherein the multicast replication point is distinct from a unicast video output point of the buffer.

9. The method of claim 8, wherein the multicast replication point is at a beginning portion of the fast channel change buffer and the unicast video output point is at an end portion of the fast channel change buffer.

10. The method of claim 6, wherein the video server is further configured to use the fast channel change buffer as an error correction buffer.

11. A server comprising:

a plurality of buffers;

a processor;

a memory accessible by the processor; and

a computer program embedded within the memory, the computer program comprising instructions executable by the processor to perform operations including;

buffering a plurality of video streams within the plurality of buffers, wherein the video streams correspond to channels;

generating, via a buffer of the plurality of buffers, a unicast video output for a particular channel and a multicast video output for the particular channel;

receiving a request for the particular channel of the channels from a set top box;

joining the set top box to a multicast group associated with the particular channel;

sending the unicast video output for the particular channel to the set top box via a plurality of data packets until a determination by the processor indicates that the set top box joined the multicast group; and

sending the multicast video output for the particular channel to the set top box when the determination by the processor indicates that the set top box joined the multicast group.

12. The server of claim 11, wherein the request is a channel change request.

13. The server of claim 11, wherein the plurality of video streams is received via multicast from an acquisition server.

14. The server of claim 11, wherein the buffer comprises a fast channel change buffer operative to receive and buffer a video input, and wherein the fast channel change buffer is operative to provide the multicast video output.

15. The server of claim 14, wherein the fast channel change buffer further comprises a multicast replication point operative to provide the multicast video output associated with a multicast group to a plurality of set top boxes.

16. A method comprising:

sending a channel change request corresponding to a selected channel from a set top box to a first server;

determining, at the set top box, whether the first server is in service;

when the first server is in service;

receiving a unicast video output for the selected channel from a buffer at the first server prior to joining a multicast group associated with the selected channel, wherein the unicast video output is received continuously via a plurality of data packets until a determination by the first server indicates that the set top box has been joined to the multicast group associated with the selected channel; and

receiving a multicast video output for the selected channel from a multicast replication point of the buffer after joining the multicast group associated with the selected channel.

17. The method of claim 16, wherein the unicast video output and the multicast video output are both based on a buffered video stream.

18. The method of claim 16, further comprising:

when the first server is not in service;

transmitting a request for the selected channel to an acquisition server that provides a multicast video stream to the first server; and

receiving the multicast video stream from the acquisition server.

19. The method of claim 18, further comprising receiving the multicast video stream from the first server after the first server has returned to service.

20. The method of claim 16, wherein the multicast replication point is distinct from a unicast video output point of the buffer.