HLS / DASH Lip-Sync Debugging Checklist

One page: the four failure modes (priming, rendition edits, ad-insertion period/discontinuity reset, segment-duration drift), the DASH presentationTimeOffset formula, the symptom-to-cause decision path, and why the fix is at the packager.

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Book cover: Video Streaming, Volume 2 of the Fora Soft Video Engineering Handbook

The book · Volume 2 of 7

Video Streaming: A Complete Guide to Video Delivery: From Network Protocols and Transport to Ingest, HLS, and MPEG-DASH

This checklist covers four lip-sync failure modes in HLS and DASH, the presentationTimeOffset formula, a symptom-to-cause path and why the fix belongs at the packager. Volume 2 covers this layer in depth: segmented delivery with HLS, MPEG-DASH and CMAF, packaging, and the timing budget from encoder to network. Written by Nikolay Sapunov, CEO at Fora Soft.

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Debugging lip-sync drift in your HLS or DASH streams after ads or edits?

Send us a manifest and sample segments, and we will find the timestamp issue and fix it at the packager. 250+ video products shipped since 2005.

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