AV Synchronization System Using Pre-Post Encode Offset Detection
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Solution Overview
Problem
Streaming platforms face challenges in maintaining audio-video (AV) synchronization, leading to user experience degradation, as existing solutions struggle to accurately detect desynchronization without relying on 'lip-reading' algorithms and are difficult to diagnose, particularly due to issues with video encoders.
Innovation Solution
An AV synchronization system that captures pre-encode and post-encode media streams, aligns audio and video components, and determines offsets to assess synchronization, allowing for continuous monitoring and detection of desynchronization without relying on talking heads or lip-reading algorithms, and can identify if audio is ahead or behind video.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lip-reading algorithms are used to detect AV desynchronization, then detection capability is improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent extracts the essential synchronization information from audio and video streams by capturing timestamps and metadata during encoding, rather than analyzing full audio-video content. This extraction approach achieves detection accuracy without requiring complex lip-reading algorithms, as the synchronization state is directly encoded in the stream metadata.
Solution Approach 2:
The system performs preliminary synchronization validation during the encoding process itself, capturing pre-encode and post-encode stream characteristics at the source. This preliminary action allows detection of synchronization issues before they reach playback, eliminating the need for complex post-processing analysis algorithms.
2Difficulty of detecting and measuring
If video encoder issues are investigated to diagnose AV desynchronization, then diagnostic accuracy is improved, but system complexity and troubleshooting difficulty increase
Solution Approach 1:
The patent implements feedback mechanisms where the video encoder outputs synchronization status information and offset measurements back to the control system. This feedback allows automatic diagnosis of encoder issues without requiring complex manual troubleshooting, as the encoder itself provides diagnostic data about its synchronization state.
Solution Approach 2:
The video encoder performs self-diagnosis by monitoring its own output streams and generating synchronization status reports. This self-service capability allows the system to identify encoder issues automatically without external intervention, maintaining high diagnostic accuracy while simplifying the overall system architecture.
3Reliability
If continuous monitoring of pre-encode and post-encode streams is implemented, then AV synchronization detection reliability is improved, but computational load and processing time increase
Solution Approach 1:
The system applies partial monitoring by selectively analyzing key synchronization parameters (timestamps, frame rates, audio sample rates) rather than processing entire audio-video streams continuously. This partial action approach maintains detection reliability by focusing on critical synchronization indicators while significantly reducing computational load.
Solution Approach 2:
The monitoring process is segmented into discrete analysis points during the encoding workflow, checking synchronization at specific intervals and transitions rather than continuous real-time analysis. This segmentation maintains reliability for detecting actual desynchronization events while improving processing efficiency by avoiding redundant continuous computation.
Data Source
AI summary
Concepts and technologies disclosed herein are directed to audio and video synchronization. According to one aspect disclosed herein, an audio-video (“AV”) synchronization system can simultaneously capture samples of a pre-encode media stream and a post-encode media stream. The pre-encode media stream can include AV content prior to being encoded. The post-encode media stream can include the AV content after being encoded. The AV synchronization system can align a pre-encode video component of the pre-encode media stream with a post-encode video component and can determine a video offset therebetween. The AV synchronization system can align a pre-encode audio component of the pre-encode media stream with a post-encode audio component of the post-encode media stream and can determine an audio offset therebetween. The AV synchronization system can then compare the video offset and the audio offset to determine if the post-encode media stream is synchronized with the pre-encode media stream.