How to Fix Audio Delay and Subtitle Sync Problems When Streaming

Few things are as distracting as voices that do not match lips, or subtitles that appear a beat too early. Sync problems usually come from the processing chain between the stream and your ears — the TV, the soundbar, a Bluetooth connection — rather than from the stream itself. That means they can usually be fixed at home.

Audio out of sync: start by finding where the delay comes from

Every device that touches the picture or sound adds a small delay. TVs spend time processing the picture; soundbars and receivers spend time processing audio; Bluetooth adds its own delay. Lip-sync problems appear when these delays do not match.

Step 1: Check whether it affects everything

• One title or channel only: the stream itself may be out of sync. Try restarting playback; if it persists, report it to the provider.
• One app only: restart or update the app, and check its audio settings.
• Every app and source: the delay is in your TV or sound setup. Continue below.

Step 2: Remove the extras

Temporarily play sound through the TV’s own speakers. If sync is perfect, the soundbar, receiver or headphones are adding delay. If it is still off, the TV’s picture processing is the likely cause.

Step 3: Reduce picture processing

Heavy processing such as motion smoothing delays the picture, and sound sent elsewhere may arrive early. Switch to a Movie or Filmmaker Mode picture preset, or turn off motion smoothing, then check again.

Step 4: Use the audio delay settings

Most TVs, soundbars and receivers include an AV sync, lip sync or audio delay adjustment. If sound arrives before the picture, add delay to the audio. Make small adjustments while watching someone speak in close-up.

Streaming devices sometimes have their own option too. Some Android TV devices and players offer an audio offset; VLC lets you adjust audio delay during playback.

Step 5: Check the audio format

Passing surround formats through to a soundbar can occasionally cause sync drift on some combinations of equipment. As a test, set the streaming device or TV audio output to PCM or Stereo. If the problem disappears, update the soundbar’s firmware or try another format.

Step 6: HDMI ARC and eARC

If your soundbar is connected by HDMI ARC or eARC, make sure it is in the TV port labelled ARC/eARC and that HDMI-CEC is on. Some TVs automatically compensate for soundbar delay over eARC. Updating TV and soundbar firmware fixes many sync bugs.

Bluetooth headphones and speakers

Bluetooth audio always introduces some delay, and the amount depends on the headphones, the codec they use and the TV or device. Phones and some streaming devices compensate automatically for video; many TVs do not.

• Check whether the TV or device has a Bluetooth audio delay setting.
• Keep the headphones close to the device and away from interference.
• For TV listening, headphones designed for TV use with low-latency connections, or wired headphones, avoid the problem altogether.

Subtitles out of sync

Subtitle timing is part of the subtitle file supplied with the video, so problems usually come from:

• The subtitle track itself: some titles have more than one subtitle track; try another, such as the SDH version.
• A different version of the video: if subtitles were made for a different cut, they drift progressively. Report this to the provider.
• App bugs: restart playback or update the app.

Media players such as VLC let you shift subtitle timing during playback, which is useful for your own files. Streaming apps generally do not offer this, so persistent issues should be reported to the service.

Subtitles you cannot read

If subtitles are in sync but hard to read, adjust their size and style at the system level so apps inherit your choice. Our guide to accessible subtitles and audio settings shows where to find these options on each platform.

A quick troubleshooting order

1. Does it affect all content? If not, restart playback or the app.
2. Does it persist on TV speakers? If not, focus on the soundbar or headphones.
3. Turn off motion smoothing.
4. Adjust AV sync or audio delay.
5. Test with PCM audio output.
6. Update firmware on the TV, soundbar and streaming device.

Common questions

Why is sound in sync on TV speakers but not on my soundbar?

The soundbar adds its own processing delay. Use its AV sync or lip sync setting, check that it is on the TV’s ARC or eARC port with HDMI-CEC enabled, and update its firmware. Smart TV streaming setup covers ARC and CEC settings.

Do subtitles drift over a long film?

If subtitles start in sync and gradually drift, they were probably made for a different version of the video, such as a different frame rate or cut. Report it to the provider, who can fix the subtitle track.

Wrapping up

Audio sync problems are usually caused by mismatched processing delays in your setup, not by the stream. Remove components one at a time, reduce picture processing, and use the delay settings your equipment provides. Subtitle timing problems that persist across apps belong to the content itself and should be reported to the provider. If the trouble is a picture issue rather than sound, see diagnosing video playback errors.