Video Streaming Delay Calculation Using Server Buffer Feedback
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Solution Overview
Problem
Existing methods for streaming data transfer, such as those using HTTP/TCP, fail to accurately calculate delay time due to network congestion, particularly as they only consider the client buffer state and not the server state during video streaming.
Innovation Solution
An information processing apparatus that communicates with an image capturing apparatus to request and acquire segment lists, decide which segments to request, and calculate delay time based on the number of segments in the list, providing a notification of the delay level, thereby accounting for server state in delay time calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delay time is calculated taking into account only the client buffer state, then the calculation is simple, but the accuracy of delay time calculation is insufficient because server state is not considered
Solution Approach 1:
The patent merges the server buffer state information with the client buffer state information to calculate the total delay time. The server transmits its buffer state (number of segments) to the client, and the client combines this with its own buffer state to provide a comprehensive delay calculation that accounts for both ends of the streaming system.
Solution Approach 2:
The server provides feedback about its buffer state to the client by transmitting segment list information that includes the number of segments. The client uses this feedback information to adjust its delay time calculation and provide accurate delay level notifications to the user.
2Productivity
If segment transmission is controlled based on client buffer state only, then the control mechanism is simple, but the streaming performance cannot be optimized considering server state
Solution Approach 1:
The client receives feedback from the server about the number of segments in the server buffer and uses this information to dynamically adjust segment transmission control. This feedback mechanism enables optimized streaming performance by coordinating client requests with server availability.
Solution Approach 2:
The segment transmission control is made dynamic by continuously adjusting the delay time calculation based on real-time server buffer state information. The client can adapt its transmission strategy according to the current server state, optimizing performance under varying conditions.
Data Source
AI summary
An information processing apparatus which communicates with an image capturing apparatus and reproduces video data obtained by the image capturing apparatus, comprises a unit which requests a segment list in which information of segments of video data is written; a unit which acquires the requested segment list; a unit which decides which segment, from the segments in the acquired segment list to request; a unit which requests the decided segment from the image capturing apparatus; a unit which acquires the requested segment; and a unit which calculates a delay time for segment transmission based on a number of segments in the segment list.