Dynamic Buffer Adjustment for Audio Video Stream Synchronization
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Solution Overview
Problem
Current real-time multimedia transport over packet networks faces challenges in synchronizing audio and video streams due to network jitter and variations, leading to unsatisfactory lip synchronization, as existing methods rely on fixed jitter buffers that cannot adapt to changing network conditions.
Innovation Solution
A method and device that dynamically adjust buffer durations based on measured transport delays and jitters to synchronize audio and video streams, using a delay detection module to calculate average transport delays and a synchronization module to set buffer durations, allowing for flexible compensation of synchronization offsets and improving lip synchronization precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed jitter buffers are used for stream synchronization, then device complexity is reduced, but synchronization precision deteriorates under varying network conditions
Solution Approach 1:
The patent implements dynamic buffer duration adjustment by continuously measuring transport delay and jitter, then adapting buffer parameters in real-time based on network conditions. The buffer duration is no longer fixed but dynamically modified according to measured delay variations, allowing the system to maintain synchronization precision across varying network environments without requiring complex manual configuration.
Solution Approach 2:
The system establishes a feedback loop where transport delay and jitter are continuously measured from incoming packets, and these measurements feed back to adjust buffer duration parameters. This closed-loop control enables the buffer to automatically adapt to network condition changes, resolving the contradiction between simple fixed-buffer design and precise synchronization requirements under dynamic conditions.
2Manufacturing precision
If buffer durations are dynamically adjusted based on measured delays and jitters, then synchronization precision is improved, but device complexity increases
Solution Approach 1:
The buffer management system performs self-adjustment by automatically measuring transport delay and jitter from the data packets themselves, then autonomously modifying its own buffer duration parameters without external intervention. This self-service mechanism reduces the need for complex external control systems while maintaining high synchronization precision through adaptive buffer management.
3Adaptability or versatility
If average transport delays are measured and used to calculate buffer durations, then adaptability to network conditions is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses timestamps embedded in RTP packets as an intermediary carrier to convey timing information. By measuring the time difference between packet transmission timestamps and reception times, the system indirectly measures transport delay without requiring direct access to network infrastructure or complex measurement equipment, thus achieving network adaptability with manageable measurement complexity.
Data Source
AI summary
A method for stream synchronization of real-time multimedia transport over a packet network, in which the multimedia includes a first stream and a second stream which are buffered and played through buffers. The method includes: measuring average transport delays of the first and second streams; measuring transport delay jitters of the first and second streams; and calculating a delay difference between the first and second streams which corresponds to the average transport delays and the transport delay jitters of the first and second streams, and setting buffer durations. A device for stream synchronization of real-time multimedia transport over a packet network is also provided.