Shotcut Should ONLY Mix Video And Audio

Shotcut is great for this task. Aliasing happens when one or more of several things happen:

  • The video mode of the timeline is different than the resolution of the clips being placed on it. That’s likely the issue here.

  • The export resolution in the Advanced panel is changed to be larger than the timeline resolution.

  • The encoder settings for export are such low quality that macroblocks appear.

Here is documentation on the first possible issue: