IP Library › Granted Patent US 50,400
Granted Patent E1
US 50,400 · App. 17/175,344 · Granted Apr 22, 2025

Playback synchronization across playback devices

Inventor: William David Amidei (San Diego, CA)
Assignee: DIVX, LLC
H04N21/8547H04N21/2387H04N21/242H04N21/26208H04N21/43H04N21/4302H04N21/4305H04N21/6332
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Quick Facts
Patent No.
US 50,400
App. No.
17/175,344
Granted
Apr 22, 2025
Kind
E1
Abstract

Systems and methods for synchronizing the playback of streamed content on multiple playback devices is disclosed. The systems and methods include receiving time information based on a network time source in the playback devices connected to a defined network. The playback clock in each playback device is set based upon the time information. A first playback device then generates presentation time information including a start time for playback and broadcast the presentation time information to the other playback device over the defined network. The playback devices use the presentation time information to adjust the presentation time stamps of the frames of the media content in the stream.

Claims (130)

1. A method for playback of encoded media performed by a first playback device connected to a defined network including a plurality of playback devices comprising:

transmitting a request for time information from a first playback device to a network time provider;

receiving the time information from the network time provider in the first playback device;

setting a playback clock in the first playback device using the received time information;

receiving, by the first playback device, presentation time information for a stream of encoded media from another playback device of a plurality of playback devices over a defined network wherein the presentation time information includes a stream start time;

receiving, by the first playback device, a stream of the encoded media in the first playback device and presentation time information for at least some of the plurality of frames, wherein the stream includes a plurality of frames of the encoded content;

determining, using the first playback device, whether the presentation time information has been received from another one of the plurality of playback devices in response to beginning the reception of the stream of encoded media;

generating presentation time information in the first playback device in response to a determination that the presentation time information has not been received from the another one of the plurality of playback devices;

broadcasting the presentation time information from the first playback device to other ones of the plurality of playback devices connected to the defined network over the defined network;

adjusting the presentation time information of at least one of the plurality of frames of the stream in the first playback device based upon one of: the presentation time information generated by the playback device and the presentation time information received from the another one of the plurality of playback devices; and

commencing playback, by the first playback device, of the stream of encoded media based on the adjusted presentation time information of at least one of the plurality of frames.

2. The method of claim 1 further comprising, using the first playback device:

determining that a specified time period has expired;

generating updated presentation time information in response to the time period expiring; and

broadcasting the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

3. The method of claim 1 further comprising, using the first playback device:

receiving updated presentation time information from another playback device of the plurality of playback devices over the defined network; and

adjusting the presentation time information of each of the plurality of frames of the stream in the first playback device based upon the playback information.

4. The method of claim 1 wherein the time information is provided in Coordinated Universal Time.

5. The method of claim 1 wherein the start time is provided in Coordinated Universal Time.

6. The method of claim 1 wherein the network time provider is a Network Time Protocol Server and the transmitting of the request and receiving of the time information.

7. The method of claim 1 wherein the network time provider is a local time server for the defined network.

8. The method of claim 1 wherein the presentation time information includes presentation time information for a particular frame and a playback speed.

9. The method of claim 1 wherein the defined network is a local area network.

10. The method of claim 3 further comprising, using the first playback device;

determining whether the updated presentation time information is received within a specified time period;

generating updated presentation time information in response to a determination that the updated presentation time information was not received in the specified time period; and

broadcasting the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

11. The method of claim 7 further comprising:

transmitting a request for time information from the network time provider to a Network Time Protocol server, where the network time provider is a local time server;

receiving the time information from the Network Time Protocol server in the local time server;

receiving the request for time information from the first playback device in the local time server;

generating, by the local time server, the time information for the first playback device from the timing information received from the Network Time Protocol server; and

transmitting the time information from the local time server to the first playback device.

12. The method of claim 10 wherein the updated presentation time information includes presentation time information for a frame in the stream and a current playback speed.

13. A playback device for providing playback of encoded media based on a provided start time comprising: memory; and

a processor configured via a client application stored in the memory to:

transmit a request for time information to a network time provider;

receive the time information from the network time provider;

set a playback clock in the playback device using the received time information;

receive presentation time information for a stream of encoded media from another playback device of a plurality of playback devices over a defined network wherein the presentation time information includes a stream start time;

receive a stream of the encoded media in the playback device and presentation time information for at least some of the plurality of frames, wherein the stream includes a plurality of frames of the encoded content;

determine whether the presentation time information has been received from another one of the plurality of playback devices in response to beginning the reception of the stream of encoded media;

generate presentation time information in response to a determination that the presentation time information has not been received from the another one of the plurality of playback devices;

broadcast the presentation time information to other ones of the plurality of playback devices connected to the defined network over the defined network;

adjust the presentation time information of at least one of the plurality of frames of the stream in the playback device based upon one of: the presentation time information generated by the playback device and the presentation time information received from the another one of the plurality of playback devices; and

commence playback of the stream of encoded media based on the adjusted presentation time information of at least one of the plurality of frames.

14. The playback device of claim 13 wherein the client application further configures the processor to:

determine that a specified time period has expired;

generate updated presentation time information in response to the time period expiring; and

broadcast the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

15. The playback device of claim 13 wherein

the client application further configures the processor to:

receive updated presentation time information from another one of the plurality of playback devices over the defined network; and

adjust the presentation time information of each of the plurality of frames of the stream in the playback device based upon the presentation time information.

16. The playback device of claim 13 , wherein the presentation time information includes a playback speed.

17. The playback device of claim 13 wherein the defined network is a local area network.

18. The playback device of claim 13 wherein the time information is provided in Coordinated Universal Time.

19. The playback device of claim 13 wherein the start time is provided in Coordinated Universal Time.

20. The playback of claim 13 wherein the network time provider is a Network Time Protocol Server and the transmitting of the request and receiving of the time information are performed using Network Time Protocol.

21. The playback device of claim 15 herein the client application further configures the processor to:

determine whether the updated presentation time information is received within a specified time period;

generate updated presentation time information in response to a determination that the updated presentation time information was not received in the specified time period; and

broadcast the updated presentation time information to the other playback devices connected to the defined network over the defined network.

22. The playback device of claim 15 wherein the updated presentation time information includes presentation time information for a particular one of the plurality of playback frames in the stream of encoded media and a playback speed.

23. A method for playback of encoded media, the method comprising:

transmitting a request for time information from a first playback device to a network time provider;

receiving the time information from the network time provider in the first playback device;

setting a playback clock in the first playback device using the received time information;

receiving, by the first playback device, presentation time information for a stream of encoded media from another playback device of a plurality of playback devices over a defined network wherein the presentation time information includes a stream start time;

receiving, by the first playback device, a stream of the encoded media and presentation time information for at least some of a plurality of frames, wherein the stream includes the plurality of frames of the encoded media;

determining, using the first playback device, whether the presentation time information has been received from another one of the plurality of playback devices in response to beginning the reception of the stream of encoded media;

generating presentation time information in the first playback device in response to a determination that the presentation time information has not been received from the another one of the plurality of playback devices;

adjusting the presentation time information of at least one of the plurality of frames of the stream in the first playback device based on the presentation time information received from the another one of the plurality of playback devices;

commencing playback, by the first playback device, of the stream of encoded media based on the adjusted presentation time information of at least some of the plurality of frames; and

broadcasting the generated presentation time information from the first playback device to other ones of the plurality of playback devices connected to the defined network over the defined network, wherein at least one of the other ones of the plurality of playback devices adjusts the presentation time information of at least one of the plurality of frames of the stream in the at least one of the other ones of the plurality of playback devices based upon the generated presentation time information received from the first playback device and commences playback of the stream of encoded media based on the adjusted presentation time information of at least one of the plurality of frames.

24. The method of claim 23 further comprising, using the first playback device:

determining that a specified time period has expired;

generating updated presentation time information in response to the time period expiring; and

broadcasting the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

25. The method of claim 23 further comprising, using the first playback device:

receiving updated presentation time information from another playback device of the plurality of playback devices over the defined network; and

adjusting the presentation time information of each of the plurality of frames of the stream in the first playback device based upon the received updated presentation time information.

26. The method of claim 25 further comprising, using the first playback device:

determining whether the updated presentation time information is received within a specified time period;

generating updated presentation time information in response to a determination that the updated presentation time information was not received in the specified time period; and

broadcasting the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

27. The method of claim 26 wherein the generated updated presentation time information includes presentation time information for a frame in the stream and a current playback speed.

28. The method of claim 23 wherein the time information is provided in Coordinated Universal Time.

29. The method of claim 23 wherein the start time is provided in Coordinated Universal Time.

30. The method of claim 23 wherein the network time provider is a Network Time Protocol Server and the transmitting of the request and receiving of the time information are performed using Network Time Protocol.

31. The method of claim 23 wherein the network time provider is a local time server for the defined network.

32. The method of claim 31 further comprising:

transmitting a request for time information from the network time provider to a Network Time Protocol server;

receiving the time information from the Network Time Protocol server in the local time server;

receiving the request for time information from the first playback device in the local time server;

generating, by the local time server, the time information for the first playback device from the timing information received from the Network Time Protocol server; and

transmitting the time information from the local time server to the first playback device.

33. The method of claim 23 wherein the generated presentation time information includes presentation time information for a particular frame and a playback speed.

34. The method of claim 23 wherein the defined network is a local area network.

35. A playback device for providing playback of encoded media, the playback device comprising:

memory; and

a processor configured via a client application stored in the memory to:

transmit a request for time information to a network time provider;

receive the time information from the network time provider;

set a playback clock in the playback device using the received time information;

receive presentation time information for a stream of encoded media from another playback device of a plurality of playback devices over a defined network wherein the presentation time information includes a stream start time;

receive a stream of the encoded media and presentation time information for at least some of a plurality of frames, wherein the stream includes the plurality of frames of the encoded media;

determine whether the presentation time information has been received from another one of the plurality of playback devices in response to beginning the reception of the stream of encoded media;

generate presentation time information in response to a determination that the presentation time information has not been received from the another one of the plurality of playback devices;

adjust the presentation time information of at least one of the plurality of frames of the stream in the playback device based on the presentation time information received from the another one of the plurality of playback devices;

commence playback, by the playback device, of the stream of encoded media based on the adjusted presentation time information of at least some of the plurality of frames; and

broadcast the generated presentation time information to other ones of the plurality of playback devices connected to the defined network over the defined network, wherein the broadcasted presentation time information is received in at least one of the other ones of the plurality of playback devices and is used to adjust the presentation time information of at least one of the plurality of frames of the stream in the at least one of the other ones of the plurality of playback devices, wherein the adjusted presentation time information of at least one of the plurality of frames of the stream is used to commence playback of the stream of encoded media in the at least one of the other ones of the plurality of playback devices.

36. The playback device of claim 35 wherein the client application further configures the processor to:

determine that a specified time period has expired;

generate updated presentation time information in response to the time period expiring; and

broadcast the updated presentation time information to the other ones of the plurality of playback devices connected to the defined network over the defined network.

37. The playback device of claim 35 wherein the client application further configures the processor to:

receive updated presentation time information from another one of the plurality of playback devices over the defined network; and

adjust the presentation time information of each of the plurality of frames of the stream in the playback device based upon the received updated presentation time information.

38. The playback device of claim 37 wherein the client application further configures the processor to:

determine whether the updated presentation time information is received within a specified time period;

generate updated presentation time information in response to a determination that the updated presentation time information was not received in the specified time period; and

broadcast the updated presentation time information to the other playback devices connected to the defined network over the defined network.

39. The playback device of claim 37 wherein the received updated presentation time information includes presentation time information for a particular one of the plurality of playback frames in the stream of encoded media and a playback speed.

40. The playback device of claim 35 wherein the generated presentation time information includes a playback speed.

41. The playback device of claim 35 wherein the defined network is a local area network.

42. The playback device of claim 35 wherein the time information is provided in Coordinated Universal Time.

43. The playback device of claim 35 wherein the start time is provided in Coordinated Universal Time.

44. The playback of claim 35 wherein the network time provider is a Network Time Protocol Server and the transmitting of the request and receiving of the time information are performed using Network Time Protocol.

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 12, 2026
From: DIVX, LLC
To: SONIC IP, INC.
Reel/Frame 075627/0075 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 12, 2026
From: AMIDEI, WILLIAM DAVID
To: DIVX, LLC
Reel/Frame 075627/0183 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 12, 2026
From: SONIC IP, INC.
To: DIVX CF HOLDINGS LLC
Reel/Frame 075627/0251 →
CHANGE OF NAME Recorded Aug 12, 2026
From: DIVX CF HOLDINGS LLC
To: DIVX, LLC
Reel/Frame 075627/0345 →
Continuity (3)
Continuation 14814247 · Jul 30, 2015
Continuation 13907791 · May 31, 2013
Reissue 15234768 · Aug 11, 2016
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