Choose a repeatable reference
Use a scene with visible speech or a clear event and listen through the normal audio path. Do not use unrelated commentary or a dubbed track as an exact lip-sync reference. Note whether sound appears before or after the matching picture.
Check near the beginning and later in the same item. If the error grows, record the approximate viewing interval. You do not need to calculate a precise millisecond value to establish that the behaviour is changing.
Map the audio and video paths
Sound may pass through a television, receiver, soundbar, Bluetooth device or wireless speaker while the video follows another processing path. Write down the connected equipment and any extra adapter.
A temporary comparison using the television’s normal speakers can help isolate the external audio chain where that is supported and practical. Keep the item and player unchanged. Do not disconnect important accessibility equipment without an agreed alternative.
Use an adjustment for the problem it addresses
If the player or audio equipment offers a documented delay control, save the starting value and make one modest comparison. Check more than one scene after the change. A setting that fixes one passage but becomes wrong later has not resolved a drifting problem.
If only one item is affected, report its title, edition and position. If every service on the same audio path is affected, investigate that shared path. Avoid describing an item-specific problem as a universal service fault.
Keep the final report specific
Include whether the offset is fixed or growing, the selected audio track, the equipment path and whether TV speakers change it. Note any format change before the problem appears.
Restore an unsuccessful delay adjustment instead of accumulating several offsets across player, television and soundbar. Multiple compensations can mask the cause and make another source worse. The useful outcome is a repeatable comparison that a developer or equipment provider can understand.
Questions about this guide
Can a lip-sync slider correct every audio problem?
No. It can compensate for a supported fixed offset, but a growing drift or item-specific timing fault needs a different investigation.
Should I adjust the player and soundbar together?
Change one documented control at a time and keep the original values. Otherwise you cannot tell which adjustment mattered.