An example showing how to save the local device's audio and video tracks.
While connected to a Room, this app will save a video from your microphone and camera. Audio samples
and video frames are passed into a VideoFileRenderer object, where they are then encoded using
android.media.MediaCodecand saved using a android.media.MediaMuxer into a video file.
Videos are saved to the app's external files directory (
normally /sdcard/Android/data/io.livekit.android.sample.record/files/Movies).