This calculator determines the required audio delay offset in milliseconds (ms) to synchronize sound tracks with video footage. When capturing dialogue with external microphones, streaming via OBS Studio, or editing multicam interviews in Premiere Pro or DaVinci Resolve, hardware processing buffers often cause audio to lead or lag behind video lips.

### Mathematical Pipeline and Synchronization Formulas The calculator determines delay offsets from video framerate and frame offset counts:

- **Time Per Video Frame ($t_{\text{frame}}$):** Evaluated as $t_{\text{frame}} = 1,000 / \text{FPS}$ milliseconds. - **Total Delay Adjustment ($D_{\text{ms}}$):** Evaluated as $D_{\text{ms}} = \text{round}(\text{framesLag} \times [1,000 / \text{FPS}])$.

### Worked Numeric Example Suppose a live streamer captures a camera feed at 60 FPS while microphone audio is routed through an external audio interface, resulting in dialogue arriving 3 frames ahead of the video:

- **Video Framerate (FPS):** 60 - **Observed Lead / Lag:** 3 frames

**Step-by-Step Calculation:** 1. **Time per Frame:** $1,000 / 60 \approx 16.67\text{ ms}$. 2. **Total Audio Delay Offset:** $3 \times 16.667 = 50.00\text{ ms}$, rounded to **50 ms**. 3. **Application:** Entering **+50 ms** into OBS Studio's Advanced Audio Properties sync offset aligns the vocal track perfectly with lip movements.

### Client-Side Processing Note All calculations execute locally in client-side JavaScript. No video files, audio streams, or streaming configuration parameters are transmitted across any network.