Audio not in sync on export

[brian]

It would be helpful to show a screenshot of your project so we can see what clips and tracks you have.

One reason could be if Shotcut has trouble seeking in your clip, or they have variable frame rate but Shotcut does not detect it.

As an experiment, try to convert your video clips using the instructions here:

Editing Variable Frame Rate Source Clips

Introduction Sometimes users report that Shotcut is not frame accurate. For example, they split a clip on a certain frame, but then later the split is not where they expected it. Or, they put a keyframe on a certain frame, but later the keyframe seems to be on a different frame. Also, sometimes people report that the audio and video out not in sync. Symptoms like these can be caused by Variable Frame Rate (VFR) source clips. Some users report that VFR clips work in Shotcut if the VFR is subtle.…

Do the converted clips provide better synchronization?