Judge a visible event against its sound, then make a small change and see whether the gap gets smaller; sign conventions and control labels can differ.
8K IPTV · guides
A practical next step

Report audio delay clearly
Include whether the sound leads or follows the picture, and whether the issue repeats on another source.
Use the controls and account conditions that apply to your actual setup.
Read the full details
Report audio delay clearly
Include whether the sound leads or follows the picture, and whether the issue repeats on another source.
Describe lead or lag
Compare a second programme
Note any player sync adjustment already used
Use the controls and account conditions that apply to your actual setup.
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SOUND & LANGUAGE
Report audio delay
clearly
Include whether the sound leads or follows the picture, and
whether the issue repeats on another source.
01
02
03
Note any player sync adjustment already
used
Why this happens
A delay slider is easier to use when you have a clear reference. Close-up speech, a visible clap or another event with an obvious sound gives you that reference. If the sound arrives before the visible event, the audio needs to move later relative to the picture. If it arrives after the event, the relationship needs to move the other way. The important observation is the ordering you actually hear and see, not a number copied from somebody else’s setup.
Use the control documented for the installed player and start with a small adjustment. VideoLAN describes separate audio/video synchronization controls; other applications can present different labels or increments. Avoid saving a large delay as a global default until you know whether the problem affects every source. A fixed correction can help one audio route yet spoil a different channel, headset or receiver connection. Keep the original value, the output device and the direction that improved the test so the change remains reversible.
A useful way to work through it
Choose a close-up speech scene or another visible sound event.
Make one small supported delay change and compare the gap.
Keep the original value and avoid a global default until the scope is clear.