> ## Documentation Index
> Fetch the complete documentation index at: https://www.tella.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Audio and video are out of sync

> My Tella audio is out of sync with the video, voice ahead of or behind my mouth, lip sync off, audio drifts out of sync over a long recording, webcam or USB mic sound not matching video, sound delay in recording.

If your voice doesn't line up with your mouth — the audio runs slightly **ahead of** or **behind** the video — this page explains why it happens and what you can do about it.

## What causes desync

Audio and video are captured from two different devices, and they don't always arrive at your computer at exactly the same time. Your microphone can deliver sound a little faster (or slower) than your camera delivers picture, so the two end up offset.

This isn't limited to one kind of mic. It can show up with:

* **USB and webcam microphones** — including the mic built into a webcam, or a standalone USB mic.
* **A camera used as a webcam** — for example a DSLR or mirrorless camera fed in through a capture card, where its audio path is separate from the video.
* **XLR microphones** — these have a well-known offset; there's a dedicated guide for them below.

## Drift that gets worse over a long recording

There are two flavors of this problem:

* **A constant offset** — the audio is off by the same small amount the whole way through. It's there from the first second.
* **Drift** — the audio and video start roughly aligned but **gradually slip further apart** the longer you record, so the end of a long recording is noticeably more out of sync than the start.

Drift is most common with longer recordings and with setups that combine separate audio and video devices.

## There is no in-editor resync control

Tella does **not** have a way to nudge or realign audio against video inside the editor. If a recording came out of sync, the reliable fix is to correct it at the source and **re-record** with a setup that keeps the two aligned.

<Note>
  Because there's no resync slider in the editor, the goal is to prevent the offset before you record rather than to repair it afterward.
</Note>

## Fixing it before you record

The dependable approach is to delay the faster stream so the two line up, then record again. The most documented case is XLR mics, where the audio typically arrives about 100 ms early:

* **Using an XLR microphone** (like the Shure SM7B)? Follow the step-by-step setup in [How to fix audio sync for XLR microphones](/help/troubleshooting/fix-audio-sync-for-xlr-microphones). It walks through adding a small delay to the mic and routing it through a virtual microphone you select in Tella.

* **Using a USB mic, webcam, or a camera as a webcam?** There's no in-editor resync, so the reliable fix is at the source: close other apps that might be holding the mic or camera, reconnect the device, and record again. If the offset keeps coming back, send us the details below and we'll dig in.

## What to send us

If you've re-recorded and the audio is still out of sync, contact support via the in-app chat or [support@tella.com](mailto:support@tella.com) and include:

* A **share link** to a recording where the desync is visible.
* The **microphone and camera** you used (for example: webcam mic, USB mic, XLR mic + interface, or a camera via a capture card).
* Whether the audio is **ahead of** or **behind** the video.
* Whether it's **constant** or **drifts further out** over the length of the recording.
* Roughly **how long** the recording is.