How does the Built-in Mic Audio Backup feature work on Osmo Pocket 4?

Osmo Pocket 4 supports connecting two transmitters for audio recording. When at least one DJI Mic transmitter is connected, recorded video files automatically contain two audio tracks with a total of four channels:

Audio Track 1 (Transmitter Audio): With 1 DJI Mic transmitter: The Left and Right channels record the same audio from the transmitter. With 2 DJI Mic transmitters: The Left and Right channels record audio from the two transmitters separately (e.g., Left for DJI Mic Transmitter 1, Right for DJI Mic Transmitter 2).

Audio Track 2 (Built-in Stereo): This track records the Left and Right channels from the camera’s built-in microphone array. It is synchronized within the video file and is typically used for ambient sound.

When no DJI Mic transmitter is connected, the video plays the camera's built-in audio. When a DJI Mic transmitter is connected, playback defaults to the audio recorded by the transmitter.