Worked on the livekit/livekit repository to enhance audio and video synchronization by enabling the AbsCaptureTimeURI RTP extension within the RTC configuration. This feature allowed absolute capture times to be included in RTP streams, improving synchronization accuracy between publisher and subscriber paths. The approach involved re-enabling previously disabled logic to address a regression, ensuring consistent timestamp propagation across the media pipeline. Validation steps confirmed improved synchronization and reduced drift. The work was implemented using Go, with a focus on RTC configuration and RTP extensions, and included documentation and safeguards to maintain reliability and prevent accidental reversion in future deployments.