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Encode Raw Audio

Shows how to use the MediaCodec and MediaMuxer to create an mp4 file from PCM audio

This shows how to:

  1. Record raw PCM from the microphone via AudioRecord
  2. Encode it to AAC via MediaCodec
  3. Mux it into an mp4 container via MediaMuxer

Note:

For most use cases it is a lot easier to just use MediaRecorder. This is only useful if you have externally generated PCM audio. This is most commonly seen in wav files.