Synchronizing Playback of Multimedia Between In-Vehicle and Mobile Devices

Synchronizing playback of multimedia content between playback devices integrated into a primary device, such as an in-vehicle infotainment (IVI) system and one or more nearby secondary devices, such as mobile devices, being served multimedia content by the IVI system. The IVI system determines a playback latency of each mobile device and serves the multimedia content to each primary and secondary playback device with a respective delay based on a difference between a maximum playback latency across all playback devices and the respective determined playback latency. In some implementations, playback latencies may be determined using an audio signal. In other implementations, playback latencies may be determined using satellite-synchronized timestamps.