How can I fix unsynchronized audio and video?

Unsynchronized audio and video may be caused by the following:

Complete the following steps to troubleshoot the unsynchronized audio and video.

Step 1: Self-check

Check the following:

Check whether the unsynchronized audio and video is intermittent or consistent. Occasional, intermittent unsynchronized audio and video is normal due to the nature of the network and device.
If you use a custom video source, check whether the timeStamp parameter of each video frame is correct. Ensure that you are using millisecond units.

If you use a camera to capture video, the system reports the timestamp of each video frame. That is the value you need to pass in timeStamp.
Check whether the network connection is stable. You can switch to another network connection and check if the audio and video are synchronized.
If you use a third-party image enhancement SDK, disable it and re-check. If the audio and video become synchronized, then the third-party image enhancement SDK is the likely cause. Contact that SDK provider for technical support.
Switch to another device with better performance, and then check if the issue persists.
If you use a custom video renderer, check the source code of the video renderer. See the Customer renderer sample project provided by Agora for reference.

If the issue persists, contact support@agora.io. Please provide the following information to help with the troubleshooting:

The channel name with the unsynchronized audio and video.
The time frame when the unsynchronized audio and video appears.
The application scenario in which the issue occurs: communication, live interactive streaming, single-hosted interactive streaming, or co-hosted interactive streaming scenario.
The UIDs of the users sending and receiving the unsynchronized audio and video.
Whether you use a custom video source or a custom video renderer.
Whether the problem can be reproduced and the steps to reproduce.
Screen recording files.
SDK log files. See How can I set the log file?