Synchronization of content between networked devices

A method for synchronizing playback between a first device and a second device, the method comprising:

• receiving, by the first device from the second device over a network, an identifier of content to play and an indication of when to play the content, wherein a network latency is subtracted from the indication of when to play the content by the second device;
• determining, by the first device, a local clock time to play the content, the local clock time to play the content based on a time of a local clock of the first device and the indication of when to play the content;
• obtaining, by the first device from a third device over the network, the content to play based on the received identifier of content to play;
• and
• playing, by the first device, the obtained content based on the time of the local clock and the local clock time to play the content,
• wherein the content comprises a plurality of frames, and wherein the indication of when to play the content is a length of time until playback of a frame, the method further comprising receiving, by the first device from the second device over the network, a synchronization packet comprising a new length of time until playback of the frame, determining, by the first device, an expected length of time until playback of the frame based on a presentation timestamp embedded in the content, wherein the presentation timestamp indicates a timing of playback for the content, and adjusting, by the first device, a clock speed of the local clock based on the expected length of time until playback of the frame and the new length of time until playback of the frame.

A tangible, non-transitory computer readable storage medium including instructions encoded therein and executable by a processor, wherein the instructions when executed cause the processor to implement a method comprising:

• receiving, by the first device from the second device over a network, an identifier of content to play and an indication of when to play the content, wherein a network latency is subtracted from the indication of when to play the content by the second device;
• determining, by the first device, a local clock time to play the content based on a time of a local clock of the first device and the indication of when to play the content;
• obtaining, by the first device from a third device over the network, the content to play based on the received identifier of content to play;
• and
• playing, by the first device, the obtained content based on the time of the local clock and the local clock time to play the content,
• wherein the content comprises a plurality of frames, and wherein the indication of when to play the content is a length of time until playback of a frame, the method further comprising receiving, by the first device from the second device over the network, a synchronization packet which defines a new length of time until playback of the frame;
• determining, by the first device, an expected length of time until playback of the frame based on a presentation timestamp embedded in the content, wherein the presentation timestamp indicates a timing of playback for the content;
• and adjusting, by the first device, a clock speed of the local clock based on the expected length of time until playback of the frame and the new length of time until playback of the frame.