How to Fix OBS Mic Delay on TikTok Live: Sync Your Audio Perfectly

Eliminate audio-video desync in your live stream by accurately measuring virtual camera processing lag and setting a sync offset in OBS.

The "Lip-Sync" Nightmare on TikTok Live

There is nothing more distracting to a viewer than a mic that doesn't match the video. On TikTok Live, this problem is amplified because most creators use the OBS Virtual Camera to send their feed into TikTok Live Studio.

Because your video has to be processed by OBS, then sent to a virtual driver, and then picked up by TikTok, a "latency gap" is created. Usually, the video is slower than the audio, making your voice hit the stream before your mouth moves.

Root Cause: The Virtual Pipeline Latency

When you stream directly from OBS to Twitch, the software handles the sync internally. But when you use TikTok Live Studio as the "middleman," you are dealing with three separate processing stages:

1. OBS Processing: Rendering your scenes and filters.
2. Virtual Camera Driver: Converting that render into a webcam-style feed.
3. TikTok Live Studio: Re-encoding that feed for the TikTok servers.

Each of these steps adds 50–200ms of delay to the video, but your microphone is often sent directly to TikTok or processed faster by OBS, creating the desync.

Core Insight: The "Clap Test" Diagnosis

You cannot fix what you haven't measured. Most streamers guess their delay, which leads to "over-correction" and more frustration.

One Paragraph Insight

To find your exact delay, record a 10-second clip of yourself clapping loudly once while in your full streaming setup. Open that clip in a video editor (or even a free tool like VLC) and look at the timestamp where the "clap" sound happens versus the frame where your hands actually touch. The difference between those two points is your Sync Offset.

Step-by-Step Solution: Fixing the Sync in OBS

Once you have your measurement (e.g., 150ms), follow these steps to lock it in.

1. Access Advanced Audio Properties

In OBS, look at your Audio Mixer. Click the three dots (or gear icon) next to your Microphone source and select Advanced Audio Properties.

2. Set the Sync Offset

Find your microphone in the list. Under the Sync Offset (ms) column, enter your measurement.

• If the audio is too early: Enter a positive number (e.g., 150). This tells OBS to hold the audio for 150ms before sending it out.
• If the audio is too late: (Rare) Enter a negative number.

3. Route Audio via Virtual Cable (Recommended)

Audio-Video Sync Routing Diagram: Precisely routing OBS-processed synced audio into TikTok Live via virtual audio cables.

If you are using TikTok Live Studio, don't select your "raw" mic in TikTok. Instead:

1. Install VB-Audio Virtual Cable.
2. In OBS Settings > Audio, set your Monitoring Device to CABLE Input.
3. In Advanced Audio Properties, set your Mic to Monitor and Output.
4. In TikTok Live Studio, set your Microphone to CABLE Output.

This ensures that the delay you set in OBS is actually carried over to TikTok.

Decision Flow: Virtual Cam vs. Direct Stream Key

Audio-Video Delay Diagnostic Logic: Determining delay sources based on connection method (Virtual Camera vs. Stream Key) and guiding the correct sync offset settings.

What this diagram shows

The method you use to connect to TikTok determines how much delay you need. If you have a "Stream Key," you avoid the Virtual Camera bottleneck entirely, significantly reducing the need for high offset values.

Verification & Edge Cases

The "Drifting" Delay

If your audio starts in sync but gets worse over an hour, you likely have a Sample Rate Mismatch.

• Fix: Ensure your Windows Sound Settings, OBS, and TikTok Live Studio are all set to the same sample rate (either 44.1kHz or 48kHz). Never mix them.

Buffer Bloat

If the delay changes every time you restart, disable "Use Hardware Buffering" in your Microphone's properties (right-click the source > Properties). This forces OBS to handle the timing rather than the Windows driver.

Verification Check: Do a 30-second "Test Record" in TikTok Live Studio before every session. If the clap matches, you're good to go.