Why AutoCast dubbing follows your clicks and zooms
AutoCast times each dubbed line to what's on screen at that moment, instead of laying down one continuous audio track — here's why that matters for tutorials.
Updated 2026-07-23 · AutoCast v3.0 · macOS 14+
Who this is for
Anyone wondering why a dubbed line finishes early or late compared to the original, or why AI Shorten exists at all — this explains the timing model behind AutoCast dubs.
The short answer
Most dubbing tools translate your narration into one continuous audio track and drop it under the video, independent of what’s happening on screen. AutoCast doesn’t work that way. Each spoken line is anchored to the click or zoom it originally accompanied, so the dub stays in sync with what your viewer is looking at — not just with the video’s total runtime.
Why this matters for tutorial-style content
Narration matches the action. If you said “now click Settings” while clicking Settings, the dubbed line is timed to land at that same click — in every language.
Zooms and callouts still make sense. AutoCast’s auto-zoom highlights the part of the screen you interacted with. If dubbed audio drifted independently of those zooms, a translated line could finish while the zoom is still highlighting the previous step.
It’s what makes editing one line cheap. Because each line is pinned to its own click or zoom rather than chained to the lines around it, editing or shortening one line doesn’t shift the timing of every line after it.
Steps to see it in action
Record a short screen capture with a couple of clicks, narrating what you’re doing as you go.
Play back the dub and watch the zoom markers in the timeline — each translated line starts and plays alongside the same click or zoom as the original.
What you should see
The dubbed audio’s pacing may differ from the original (translations are often longer or shorter), but each line still begins at the same on-screen moment it did in your original recording.
Common issues or troubleshooting
A line feels rushed — this is usually a translation that ran long for the time available on screen. Flagged lines show “Too long” with a one-click fix — see AI Shorten too-long lines.
Timing looks off after editing a line — editing or shortening one line only regenerates that line; it doesn’t shift neighboring lines, so if something still looks wrong after an edit, re-check that specific line rather than the whole sequence.