bandwidth: 400
audio_info {
  codec: "mp4a.40.2"
  sampling_frequency: 44100
  time_scale: 1200
  num_channels: 2
}
reference_time_scale: 50
container_type: 1
media_file_name: "test_output_file_name_audio1.mp4"
media_file_url: "test_output_file_name_audio1.mp4"
media_duration_seconds: 10.5