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21 December 2017

Extract Spatial Audio from Ricoh Theta V

by 李丁

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The most recent Ricoh Theta V camera supports spatial audio recording. To examine the spatial audio content, here are the steps. A nice byproduct of this process is a youtube-ready panorama video.

  1. Download all three software packages listed on Theta V official website – we will need all of them: https://theta360.com/en/support/download/
    • Basic app.
    • File transfer app.
    • Movie converter app.
  2. Record a 360 video with your Theta V. By default, Theta V with the latest firmware records spatial audio, without any accessory. Although an external microphone can improve the audio quality, I only use the camera itself without the external mic.
  3. Get the video to your computer.
    • Power on Theta V.
    • Connect Theta V to your computer using microUSB cable.
    • Transfer the raw video using File transfer app. Let’s call it raw.mp4.
    • Drag and drop raw.mp4 onto the Basic Theta app. Uncheck the [top/bottom correction] box. Start export. Let’s call this corrected.mp4.
    • Drag and drop corrected.mp4 onto the Movie converter app. A mov file will be generated with spatial audio content. Since this file is ready to be uploaded to youtube, we call this file youtube.mov.
  4. Extract spatial audio
    • ffmpeg -i youtube.mov -vn spatial_audio.wav
    • The -vn option is to disable video output.
    • spatial_audio.wav should have 4 channels, following youtube ambisonic standard, i.e. ACN, SN3D, WXYZ.
    • To verify, you can drag spatial_audio.wav into Audacity to see that it indeed has 4 channels.

[caption id=”attachment_287” align=”aligncenter” width=”713”] World Trade Center Oculus PATH Station The Oculus - World Trade Center PATH Station[/caption]

PS: Theta V’s video quality is way better than its Theta S little brother.

tags: research |

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