Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing a video to subscribers of a messaging system. A method includes obtaining a live video stream generated by a video source. The method also includes publishing one or more messages including one or more frames of the live video stream to a first channel of a plurality of channels. The video source is associated with the first channel.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing a video to subscribers of a messaging system. A method includes obtaining a live video stream generated by a video source. The method also includes publishing one or more messages including one or more frames of the live video stream to a first channel of a plurality of channels. The video source is associated with the first channel.

Abstract: Providing a video stream and metadata over channels is described. The method may include receiving a first message on a first channel of a plurality of channels, the first message encapsulating a video frame of a plurality of video frames. The method may also include generating, by a computer processing device, a second message comprising annotation metadata describing a characteristic of the video frame. The method may also include publishing the first message to a second channel of the plurality of channels and publishing the second message to a third channel of the plurality of channels.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving a first message on a first channel of a plurality of channels, wherein the first message comprises a video frame of a plurality of video frames and metadata describing characteristics of the video frame. The video frame is analyzed to detect an object within the video frame. Based on the analysis, the analysis metadata indicating the analysis performed and an indication of the detected object can be generated and then encapsulated in a new message with the video frame. The new message can be published to a second channel.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing a video to subscribers of a messaging system. A method includes obtaining a live video stream generated by a video source. The method also includes publishing one or more messages including one or more frames of the live video stream to a first channel of a plurality of channels. The video source is associated with the first channel.