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Aligning Playback, Effects, and Audio Session on a Single Path

2025.09.03Technical Log#playback#product-ui#sound-engine

Resolved playback inconsistencies caused by reels, the effects chain, and the audio session each modifying state independently at different points. Consolidating the three into a unified processing order ensures audio state remains consistent across screen transitions and playback resumptions.

When reels playback, the effects chain, and the audio session each manage state at different points in the lifecycle, outcomes vary depending on the order of operations. This produced observable issues: audio lagging behind video on screen transitions, or the next track loading while reverb from the previous one was still active. These inconsistencies do not surface in a feature checklist, but they directly undermine playback reliability.

The fix consolidates track load and unload sequencing, video transition and loop synchronization, and resource cleanup into a single unified flow. With the previously distributed handling brought under a common processing order, the same action consistently produces the same result.

On the discovery and recommendation side, moment and inst content now follow the same exposure rules. The integration point for spatial and reverb effects was also corrected to connect properly into the active playback path. As a result, audio state is maintained without interruption across screen transitions and playback resumptions.