Problem Cause: After the audio was played over bluetooth, there was the problem that the size of the written data was updated incorrectly. Due to an incorrect size, the audio and video synchronization on the speaker was incorrect. Problem Countermeasure: We change the total size of written data to update normally, and the a / v synchronization problem will be fixed on Next MR. Until the next MR, we can solve it indirectly with the steps below. Whatever social media app it is, registering one app for bluetooth is enough to solve the problem. Settings -> sound and vibration -> Separate app sound -> turn on now-> app: Youtube audio device: bluetooth device. And restart the device.
