Lip Synchronization via Timestamp Re-dating in Video Conferencing
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Solution Overview
Problem
Current synchronization techniques in real-time multimedia sessions over packet-switched networks face challenges in maintaining synchronicity between data streams, especially when dealing with different types of streams and varying delays, which can lead to inaccurate timestamp alignment and poor lip synchronization in video conferencing.
Innovation Solution
The method involves re-dating timestamps of packets based on estimated relative delays for transport and predicted processing time differences between streams, allowing these delays to cancel out partially, thereby ensuring synchronicity across different types of data streams, including audio and video streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate streams are used for different data channels, then data transmission flexibility is improved, but synchronization accuracy deteriorates due to varying delays
Solution Approach 1:
The system performs preliminary actions by calculating estimated relative delays for transport and predicted relative delays for processing before transmission. These delay values are used to pre-adjust timestamps, allowing delays to cancel out partially and maintain synchronization accuracy despite using separate streams for different data channels.
2Measurement precision
If timestamp adjustment is performed, then synchronization accuracy is improved, but processing complexity increases
Solution Approach 1:
The system changes parameters by adjusting timestamps based on calculated delay values. Instead of complex real-time synchronization mechanisms, the invention modifies the timestamp parameter directly, compensating for transport and processing delays through mathematical adjustment rather than complex control logic.
3Reliability
If relative delays are compensated, then lip synchronization quality is improved, but computational requirements increase
Solution Approach 1:
The invention replaces complex mechanical or hardware-based synchronization mechanisms with computational timestamp adjustment. By substituting physical delay compensation with mathematical timestamp modification, the system achieves lip synchronization quality while reducing actual processing overhead compared to real-time hardware synchronization.
Data Source
AI summary
Disclosed herein is a method of synchronizing of a plurality of data streams having time-stamped packets, wherein the plurality of data streams are of a first type and at least a second type different than the first type, of which at least one stream of the first type is to be processed at a server. The method includes re-dating a timestamp of a packet, using a processor, based on an estimated relative delay for transport up to the server between first-type and second-type streams and a predicted relative delay representative of a processing time duration between first-type and second-type streams, thereby allowing the relative delays to cancel at least partially.