CRITICALFailure Reference

Runway Gen-3 Audio-Video Sync Drift — Refund Guide

Technical Classification

Audio-Visual Temporal Misalignment

Audio-Visual Temporal Misalignment occurs when Runway's generated soundtrack desynchronises from the visual track. The decoder operates at a different effective frame rate than the audio sampler, so a clip that starts in-sync drifts by 100–400ms by the end. The failure is most severe on clips longer than 6s with prominent speech, percussive action (footsteps, hammer strikes, clapping), or any sound cue tied to a specific visual frame.

How to identify this failure

✕Lip movement leads or trails dialogue audio
✕Footstep sound plays before or after foot contact
✕Audio cue fires on the wrong frame relative to prompt-specified beats
✕Drift accumulates — sync OK at 0s, broken by 6s
✕Background music tempo mismatches visible rhythm

Real generation examples

Prompt used

"Drummer playing a snare roll, close-up of hands and sticks"

Failure observed @ 0:04

Audio leads visual stick contact by 280ms at 0:04; drift increases through clip

Prompt used

"Woman speaking directly to camera, professional lighting"

Failure observed @ 0:02 → 0:06

Lip movement lags audio by ~180ms at 0:02, ~340ms by 0:06

Documentation strength

If you need to escalate

HIGH — Runway support recognises audio drift as a generation-pipeline defect, especially when measurable in milliseconds. Always cite the drift magnitude and timestamp.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Audio-Visual Temporal Misalignment pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Audio-Visual Temporal Misalignment first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Audio-Visual Temporal Misalignment". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Will Runway support escalate audio-sync failures?

Yes. When you can quote the drift in milliseconds and timestamp the offset, Runway support routinely refunds. Use the term "Audio-Visual Temporal Misalignment" and attach the AVA audit report.

Why does Runway audio go out of sync?

The video decoder and audio sampler don't share a unified clock during generation; their effective rates drift relative to one another, especially across longer clips with high motion.

Which Runway prompts are highest risk for sync drift?

Anything with speech, percussion, or precise visual-audio events. AVA flags audio-bearing prompts longer than 5 seconds for pre-generation review.

Catch it before you generate

AVA scores this failure mode against your prompt in real time

Free Chrome extension. Analyzes your prompt as you type, flags failure-prone patterns specific to this model, and tells you what to rewrite — before you commit credits to a generation that will fail.

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