THE CHALLENGES AND THE FUTURE OF 360º VIDEO STREAMING
programming Posted on Jul 17, 2017
At XenoPsi, we've recently completed our first immersive experience project - a virtual reality video for one of our clients. As exciting as it was to work with a new technology, there were some unique challenges to overcome. In this article, we are going to tell you about those challenges as well as common misconceptions people have about 360º videos.
The Difference Between Standard and 360º Videos
If you have watched a 360º video on YouTube or Facebook, you must have noticed that the video quality is always very poor. 360º videos are fuzzy even when watched over a high-speed Internet connection. That happens because videos have to adjust the content for the 360º experience.
In standard HD videos the whole video frame is visible at once. For example, a 1080p resolution means your field of view is 1920 pixels wide and 1080 pixels tall. That creates a very crisp, detailed image. However, in a 360º video the same content is stretched to fit 180º vertically and 360º horizontally. This means that your field of view is always limited to about 100º.
Most people think that when they are watching a 4K 360º video, the field of view has the same 4K resolution. But while the whole 360º sphere is in 4K, the visible area is just one-sixth of that resolution. This reduces the quality and makes you see fewer details. Therefore, 360º videos need to be at least 8K to offer HD quality in your field of view.
Internet Bandwidth Limitations and Outdated Streaming Solutions
Most home Wi-Fi and mobile Internet connections in US can only stream up to 1080p videos. So, most virtual reality videos need to be downloaded first. That's not ideal because the download takes a long time and occupies a lot of storage space on mobile devices. For example, a 10-minute 4K video can be as large as 1GB and it needs about half an hour to download.
With Internet bandwidth limitations and 360º video’s large file sizes, the current streaming technology isn't optimized for 360º videos. For one thing, it's ineffective because the whole video is being downloaded even though the user is only seeing one-sixth of the video at any given time.
The Future of 360 and VR Streaming
The good news is that the VR industry is progressing steadily. Here are some of the main industry advances that will ensure that high quality and almost realistic VR and 360º videos will appear in the near future:
1. VIEW-OPTIMIZED STREAMING
This is a revolutionary streaming method that is currently being developed by several different companies. View-optimized streaming works in such a way that only the parts of the video the user is watching will be transferred. Because users only see a 100 degrees video section at any given time, this technology will improve the quality by 400% or even more.
2. BETTER CAMERAS AND IMPROVED STITCHING ALGORITHMS
Cameras and stitching algorithms are constantly getting better. This means that soon it will be possible to shoot and stitch 8K videos.
3. ENHANCED VR VIDEOS COMPRESSION
While video compression is already quite good, it's reasonable to expect it to improve even further. A 25% reduction in VR video size should be easy to achieve.
4. FASTER INTERNET CONNECTION
According to Nielsen’s law, Internet connections speeds are steadily growing by 50% per year. Increased bandwidth will allow people to flawlessly stream better quality videos and reduce download times.
It is projected that people will start watching 12K and even 16K virtual reality videos in next couple of years. These videos will be as sharp as our physical reality.