Audio Video Synchronization via Network Delay Compensation
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Solution Overview
Problem
Network transmission delay causes audio and video to become out of sync when played across devices connected via a network, affecting user experience.
Innovation Solution
A method for audio and video synchronization that involves receiving audio data from a video source device, determining the network delay change between the audio and video devices, and adjusting the audio data by adding or deleting audio sampling points based on the network delay change and a preset adjustment strategy, ensuring synchronization between the audio and video playback devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio data is transmitted via network from video player to audio player, then audio playback can be distributed across multiple devices, but network transmission delay causes audio and video to become out of sync
Solution Approach 1:
The system performs preliminary actions by pre-calculating and compensating for network delay before audio playback. The audio player receives delay information from the video player and proactively adjusts its playback timing by adding or removing audio sampling points in advance, ensuring synchronization is maintained throughout playback rather than reacting to delays after they occur.
Solution Approach 2:
The system changes the parameter of audio data by dynamically adding or removing audio sampling points based on the monitored network delay. When delay increases, audio sampling points are added to extend audio duration; when delay decreases, sampling points are removed to shorten duration, thereby matching audio playback duration with video playback duration in real-time.
2Reliability
If audio sampling points are added or deleted to compensate for network delay, then audio and video synchronization is improved, but audio data quality and continuity may be affected
Solution Approach 1:
The system applies partial action by adjusting only the necessary portion of audio data to compensate for network delay. Instead of reprocessing entire audio streams, it selectively adds or removes specific audio sampling points based on the actual delay magnitude, minimizing disruption to the overall audio data structure and continuity while achieving synchronization.
3Measurement precision
If real-time monitoring of network delay is implemented, then audio and video synchronization accuracy is improved, but system complexity and computational overhead increase
Solution Approach 1:
The system implements feedback by having the video player continuously monitor network delay and send delay information to the audio player in real-time. The audio player then uses this feedback to dynamically adjust its playback by adding or removing audio sampling points, creating a closed-loop control system that automatically maintains synchronization without complex manual intervention.
Data Source
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AI summary
A method for audio and video synchronization, includes: receiving audio data sent by the video player, wherein the audio data includes more than one audio sampling points; obtaining a network delay change between the audio player and the video player, wherein the network delay change refers to a time difference between the network delay monitored for the first time and the network delay monitored for the last time; determining a total amount of audio data to be adjusted according to the network delay change; and adding audio sampling points to the received audio data or deleting audio sampling points from the received audio data according to the total amount of audio data to be adjusted and a preset adjustment strategy, so that the audio player is synchronized with the video player, and playing the added or deleted audio data.