public int getAudioTracksCount() {
    return audioTracks_.size();
  }
<pre>
Optional. For file formats, such as MXF or MKV, supporting multiple audio
tracks, specify up to two tracks. Default: track 0.
</pre>

<code>repeated int32 audio_tracks = 6 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The count of audioTracks.
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/SpeechTranscriptionConfig.java