Rendition Switch Indicator for Adaptive Video Streaming
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Solution Overview
Problem
Adaptive bitrate streaming faces challenges in reducing end-to-end latency while maintaining high video quality, as reducing segment duration increases the frequency of key frames, leading to decreased image quality and fidelity.
Innovation Solution
Introducing S-frames, which allow rendition switching between segments, enabling efficient latency reduction without compromising image quality by ceasing higher quality renditions and switching to lower quality renditions at S-frames, in addition to key frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If segment duration is reduced to decrease end-to-end latency, then latency is reduced, but key frame frequency increases leading to decreased image quality
Solution Approach 1:
The video stream is segmented into smaller chunks with duration reduced to 2-10 seconds, allowing more frequent rendition switching opportunities. This segmentation enables the system to switch renditions at finer granularity without being constrained by longer segment boundaries, thus reducing latency while maintaining image quality through selective key frame usage.
Solution Approach 2:
The patent introduces S-frames with rendition switch indicators that allow selective rendition switching at specific locations (S-frames) rather than uniformly at every key frame. This local quality approach enables the system to switch to lower quality renditions only when and where appropriate (at S-frames), while maintaining high quality at key frames, thus resolving the contradiction between latency reduction and image quality preservation.
2Adaptability or versatility
If key frame frequency is increased to enable more frequent rendition switching, then rendition switching responsiveness is improved, but image quality and fidelity decrease
Solution Approach 1:
S-frames serve as intermediary elements between key frames, providing additional rendition switching opportunities without requiring increased key frame frequency. The S-frames with rendition switch indicators act as mediators that enable responsive rendition switching while preserving key frame integrity and image quality, as key frames remain at their original lower frequency for quality maintenance.
Solution Approach 2:
The patent implements dynamic rendition switching by introducing S-frames that can be selectively used for rendition changes based on network conditions. This dynamic approach allows the system to adapt rendition quality in real-time at S-frame locations while maintaining stable key frame structures, achieving responsive switching without the image quality degradation associated with uniformly increased key frame frequency.
Data Source
AI summary
Methods to switch between renditions of a video stream are generally described. In some examples, the methods may include encoding a video stream at a first image quality in a first rendition and a second, lower image quality in a second rendition. The methods may further include sending the first rendition to a recipient computing device. The methods may include receiving a request to switch from the first rendition to the second rendition. The methods may include determining that first indicator data of a first inter-coded frame indicates that the video stream can be switched to a lower image quality rendition at the first inter-coded frame. In some examples, the methods may further include sending the second rendition to the recipient computing device.