Adaptive Bit Rate Video Initial Selection via Above-the-Fold Bandwidth Estimation
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Solution Overview
Problem
Selecting the initial bit rate for adaptive bit rate video streaming is challenging, as it must balance avoiding buffering delays due to excessive bandwidth and ensuring high visual quality, particularly for short-form videos, where fixed or arbitrarily selected rates can result in unacceptably low quality.
Innovation Solution
Estimating available bandwidth by determining the download time of the 'above-the-fold' content and selecting an initial bit rate for video streaming within this constraint, ensuring that the video quality matches current network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the initial bit rate is set high to ensure high visual quality, then the visual quality is improved, but buffering delays occur due to exceeding available bandwidth
Solution Approach 1:
The system performs preliminary bandwidth estimation by measuring the download time of above-the-fold content before video playback begins. This preliminary action allows the system to determine the available bandwidth in advance and select an appropriate initial bit rate that matches actual network conditions, preventing buffering delays while maintaining high visual quality for short-form videos.
2Loss of time
If the initial bit rate is set low to avoid buffering delays, then buffering is prevented, but the visual quality becomes unacceptably low for short-form videos
Solution Approach 1:
The system uses feedback from measuring the actual download time of above-the-fold content to dynamically adjust the initial bit rate selection. This feedback mechanism ensures that the initial bit rate is accurately calibrated to match real-time network conditions, allowing the system to achieve both high visual quality and minimal buffering by continuously adapting to actual bandwidth availability.
3Device complexity
If a fixed initial bit rate is used to simplify the selection process, then the complexity is reduced, but the visual quality does not match current network conditions
Solution Approach 1:
The system performs self-service by automatically measuring the download time of above-the-fold content and using this information to autonomously determine the available bandwidth and select the appropriate initial bit rate. This self-service approach eliminates the need for complex manual configuration or predetermined fixed rates, allowing the system to adapt automatically to current network conditions and achieve optimal visual quality.
Data Source
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AI summary
Enhancements to adaptive bit rate techniques are described that relate to selection of the initial bit rate with which video content is delivered. The bandwidth available to a client device is estimated by determining the time required by the client device to download a specific amount of content, e.g., the "above-the-fold" portion of a requested web page. An initial bit rate is selected for video content associated with 10 the page that is within the estimated available bandwidth.