Tag Archives: Ambisonic audio

The importance of audio in VR

By Anne Jimkes

While some might not be aware, sound is 50 percent of the experience in VR, as well as in film, television and games. Because we can’t physically see the audio, it might not get as much attention as the visual side of the medium. But the balance and collaboration between visual and aural is what creates the most effective, immersive and successful experience.

More specifically, sound in VR can be used to ease people into the experience, what we also call “on boarding.” It can be used subtly and subconsciously to guide viewers by motivating them to look in a specific direction of the virtual world, which completely surrounds them.

In every production process, it is important to discuss how sound can be used to benefit the storytelling and the overall experience of the final project. In VR, especially the many low-budget independent projects, it is crucial to keep the importance and use of audio in mind from the start to save time and money in the end. Oftentimes, there are no real opportunities or means to record ADR after a live-action VR shoot, so it is important to give the production mixer ample opportunity to capture the best production sound possible.

Anne Jimkes at work.

This involves capturing wild lines, making sure there is time to plant and check the mics, and recording room tone. Things that are already required, albeit not always granted, on regular shoots, but even more important on a set where a boom operator cannot be used due to the 360 degree view of the camera. The post process is also very similar to that for TV or film up to the point of actual spatialization. We come across similar issues of having to clean up dialogue and fill in the world through sound. What producers must be aware of, however, is that after all the necessary elements of the soundtrack have been prepared, we have to manually and meticulously place and move around all the “audio objects” and various audio sources throughout the space. Whenever people decide to re-orient the video — meaning when they change what is considered the initial point of facing forward or “north” — we have to rewrite all this information that established the location and movement of the sound, which takes time.

Capturing Audio for VR
To capture audio for virtual reality we have learned a lot about planting and hiding mics as efficiently as possible. Unlike regular productions, it is not possible to use a boom mic, which tends to be the primary and most naturally sounding microphone. Aside from the more common lavalier mics, we also use ambisonic mics, which capture a full sphere of audio and matches the 360 picture — if the mic is placed correctly on axis with the camera. Most of the time we work with Sennheiser and use their Ambeo microphone to capture 360 audio on set, after which we add the rest of the spatialized audio during post production. Playing back the spatialized audio has become easier lately, because more and more platforms and VR apps accept some form of 360 audio playback. There is still a difference between the file formats to which we can encode our audio outputs, meaning that some are more precise and others are a little more blurry regarding spatialization. With VR, there is not yet a standard for deliverables and specs, unlike the film/television workflow.

What matters most in the end is that people are aware of how the creative use of sound can enhance their experience, and how important it is to spend time on capturing good dialogue on set.


Anne Jimkes is a composer, sound designer, scholar and visual artist from the Netherlands. Her work includes VR sound design at EccoVR and work with the IMAX VR Centre. With a Master’s Degree from Chapman University, Jimkes previously served as a sound intern for the Academy of Television Arts & Sciences.

Assimilate’s Scratch VR Suite 8.6 now available

Back in February, Assimilate announced the beta version of its Scratch VR Suite 8.6. Well, now the company is back with a final version of the product, including user requests for features and functions.

Scratch VR Suite 8.6 is a realtime post solution and workflow for VR/360 content. With added GPU stitching of 360-video and ambisonic audio support, as well as live streaming, the Scratch VR Suite 8.6 allows VR content creators — DPs, DITs, post artists — a streamlined, end-to-end workflow for VR/360 content.

The Scratch VR Suite 8.6 workflow automatically includes all the basic post tools: dailies, color grading, compositing, playback, cloud-based reviews, finishing and mastering.

New features and updates include:
– 360 stitching functionality: Load the source media of multiple shots from your 360 cameras. into Scratch VR and easily wrap them into a stitch node to combine the sources into a equirectangular image.
• Support for various stitch template format, such as AutoPano, Hugin, PTGui and PTStitch scripts.
• Either render out the equirectangular format first or just continue to edit, grade and composite on top of the stitched nodes and render the final result.
• Ambisonic audio: Load, set and playback ambisonic audio files to complete the 360 immersive experience.
• Video with 360 sound can be published directly to YouTube 360.
• Additional overlay handles to the existing. 2D-equirectangular feature for more easily positioning. 2D elements in a 360 scene.
• Support for Oculus Rift, Samsung Gear VR, HTC Vive and Google Cardboard.
• Several new features and functions make working in HDR just as easy as SDR.
• Increased Format Support – Added support for all the latest formats for even greater efficiency in the DIT and post production processes.
• More Simplified DIT reporting function – Added features and functions enables even greater efficiencies in a single, streamlined workflow.
• User Interface: Numerous updates have been made to enhance and simplify the UI for content creators, such as for the log-in screen, matrix layout, swipe sensitivity, Player stack, tool bar and tool tips.