How can i get simultaneous playback on multiple devices?
Is it possible to play the same live stream on multiple devices at the same timecode of live stream ? For example think that in the live stream there is a clock, when playing this live stream on multiple devices you see the same time?
If you are using RTMP or RTSP streaming protocols on your devices, you should be able to see the same stream at about the same time.
However, when talking about HTTP based streaming protocols, because these streaming protocols are based on media chunks, there can be a delay between different devices, depending on the time it takes to download a specific chunk and which chunk is being downloaded and played back by a specific client at a given time.
This is more of a streaming protocol restriction.
Can you describe in which scenario the simultaneous playback in different devices would be used?
There really is not a way to ensure that a live stream will be playing at the same point for each client, even among identical clients because of network factors, and between different clients because of different packetizing. The HTTP streaming types have more latency than RTMP and RTSP because of they way they are packetized into chunks.