3.Full-View Equal Quality (Viewport-Independent)

Full-View Equal Quality (Viewport-Independent)
全视图等质量（与视口无关）

Full-View Equal Quality, also known as Viewport-Independent streaming, is one of the early methods used in 360-degree video streaming. In this approach, the entire 360-degree video is encoded at the same quality level across all parts of the spherical video, irrespective of the viewer’s perspective or where they are looking within the video. Here are some key features and considerations of this streaming method:

1. Equal Quality Everywhere: In Full-View Equal Quality streaming, all portions of the 360-degree video, whether they are in the viewer’s field of view or not, are encoded at the same high quality. This ensures that no matter where the viewer looks, the video quality remains consistent.

2. Uniform Bitrate: The video is encoded at a uniform bitrate throughout, meaning the same amount of data is allocated to all parts of the video. This results in a uniform level of detail and resolution across the entire video.

3. High Bandwidth Requirements: Full-View Equal Quality streaming consumes a significant amount of bandwidth because it’s essentially transmitting the entire spherical video at the same high quality. This can be demanding for both the streaming server and the viewer’s internet connection.

4. Inefficiency: From a bandwidth utilization perspective, this method is relatively inefficient because viewers often focus on specific areas of interest within the 360-degree video. Encoding non-viewed areas at the same quality level as viewed areas wastes bandwidth.

5. Limited Adaptivity: Since all parts of the video are encoded equally, this method lacks adaptivity to the viewer’s network conditions and device capabilities. It does not adjust to provide a better experience if the viewer’s internet connection is slow or if they are using a device with limited processing power.

While Full-View Equal Quality streaming was one of the initial methods for 360-degree video, it has limitations in terms of bandwidth efficiency and adaptability. As a result, more advanced techniques, such as Viewport-Dependent streaming and tile-based strategies, have been developed to optimize the delivery of 360-degree video content, prioritizing the viewer’s field of view and conserving bandwidth where it is not needed. These newer approaches offer a better balance between quality and efficiency, making 360-degree video streaming more accessible and practical for a wider audience.