Automated Audio Video Synchronization Error Detection
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Solution Overview
Problem
Current methods rely on human testers to detect lip sync issues caused by temporal asynchrony between audio and video content in media players, which is inefficient and subjective.
Innovation Solution
An automated system generates artificially synchronized media player test samples with alternating video and audio waveforms to analyze media player output for temporal asynchrony, using computing devices to measure and quantify synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If human testers are used to detect lip sync issues, then subjective evaluation can be performed, but the evaluation process becomes inefficient and inconsistent
Solution Approach 1:
The patent replaces the mechanical system of human sensory evaluation with an automated electronic system that uses waveform analysis and cross-correlation algorithms to detect audio-video synchronization errors. The media player output is captured and analyzed by a computing device that automatically measures temporal asynchrony between audio and video components, eliminating subjectivity and improving both precision and efficiency.
2Measurement precision
If automated waveform analysis is implemented, then evaluation objectivity and precision are improved, but system complexity increases
Solution Approach 1:
The patent introduces a waveform representation as an intermediary between the media player output and the synchronization error detection. By converting audio and video signals into comparable waveform formats and using cross-correlation analysis, the system creates a standardized intermediate representation that simplifies the measurement process while maintaining high precision in detecting temporal asynchrony.
3Reliability
If comprehensive media player testing is performed, then algorithm performance can be compared and improved, but testing time and resources increase
Solution Approach 1:
The patent performs preliminary actions by generating test media with known synchronization characteristics before actual media player evaluation. The test media includes embedded timing information and standardized audio-video sequences that allow for rapid, repeatable testing. This preliminary preparation enables consistent comparison of different media player algorithms without requiring extensive testing time for each evaluation.
Data Source
AI summary
Techniques for evaluating media player performance are described. A particular implementation supplies media to a media player where the media includes a video component which has a waveform that alternates between a first video state and a second video state, and an audio component which has a waveform that alternates between a first audio state and a second audio state. In the supplied media the audio and video components are temporally synchronized in transition between respective first and second states. The process further analyzes corresponding output from the media player to determine an extent to which the audio and video components are temporally unsynchronized.