One page: the root cause (two clocks), the ppm-to-drift arithmetic, the soft-vs-hard comparison table, the audio-master rule for video, and the four common mistakes that turn drift into a bug.
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The book · Volume 5 of 7
Audio for Video: A Complete Guide to Sound in Video Products: From Jitter Buffers and Lip Sync to Atmos, Quality Metrics, and Neural Codecs
This cheat sheet explains why two clocks cause drift, the ppm-to-drift arithmetic, soft versus hard correction and the audio-master rule for video. Volume 5 covers this in depth: timestamps and clock domains, synchronization and lip sync, jitter buffers with NetEq, and diagnosing audio incidents by their symptoms. Written by Nikolay Sapunov, CEO at Fora Soft.
Audio slowly drifting out of sync in long recordings or calls?
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