Tag: #audio sync
4 articles
FFmpeg: Audio Out of Sync After Converting — Causes and Fixes
Audio and video drifted out of sync only after converting with FFmpeg? Learn why stream copy carries over bad timestamps, why a VFR source breaks sync, and fix it by re-encoding, rebuilding timestamps with +genpts, normalizing with aresample, or forcing constant frame rate.
FFmpeg: Fix Audio Drift That Gets Worse Over Time
Audio fine at the start but progressively out of sync by the end? That is drift, not a constant offset. Learn why a clock mismatch or VFR source causes it, why -itsoffset can't fix drift, and correct it with aresample async, then standardize with a fixed sample rate or CFR.
Change Video Speed with FFmpeg — Audio Sync Guide
Speed up or slow down video with FFmpeg using setpts and atempo. Covers 0.25x–10x ratios, audio-sync without drift, pitch-preserving rubberband, variable-speed sections, and smooth slow-mo via minterpolate.
FFmpeg Fix Audio Sync — -itsoffset, adelay, and -async Explained
Fix audio-video sync drift (lip sync issues) with FFmpeg: -itsoffset for lossless timestamp shift, adelay filter for millisecond-precise audio delay, -async for auto-correction, measuring drift with ffprobe, five error fixes, and five FAQ answers.