Video Audio Sync
Convert a sync offset between frames and milliseconds for picture.
About Video Audio Sync
Each frame lasts the thousand milliseconds of a second divided by the frame rate, so the frame offset converts directly to a milliseconds trim. Speech intelligibility breaks with lag beyond a few frames, so a precise frame-to-ms conversion fixes perceived sync fast.
Formula
Video Audio Sync
Offset ms = frames x 1000 / fps
- frame
- One picture at the chosen frame rate
Worked example
With the default values below, Video Audio Sync returns Offset of 66.67. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Offsetaccepts -120–120 frames
- 2 frames
- Frame rateone of 23.976, 24, 25, 29.97, 30, 60
- 30
Results
- Offset
- 66.67 ms
- Frame Interval
- 33.333 ms
- Adjustment
- Audio lags video: move audio earlier
Step by step
- 1Values used
- 2Video Audio Sync
- 3Offset= 66.67 ms
- 4Frame Interval= 33.333 ms
- 5Adjustment= Audio lags video: move audio earlier
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Video Audio Sync calculated?
Offset ms = frames x 1000 / fps Each frame lasts the thousand milliseconds of a second divided by the frame rate, so the frame offset converts directly to a milliseconds trim.
Why does Video Audio Sync matter?
Speech intelligibility breaks with lag beyond a few frames, so a precise frame-to-ms conversion fixes perceived sync fast.
What values do I need to enter?
This calculator takes 2 inputs: Offset, Frame rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.