Video on timeline corrupts after a failed export

Without a lot more information it would be impossible for anyone to help solve the issue you are having.

More information would include the following:

  • Shotcut version number (Help - About Shotcut)
  • Video Mode used
    • To view Video Mode settings, click on Output, then Properties
  • Computer specifications (CPU/Ram) (Minimum system requirements)
  • Operating system (Windows/macOS/Linux)
  • Source video specifications as shown in Shotcut’s Property window
    • Click on a video clip, then click on Properties
  • Did you use Advanced with Export settings? If so, what did you change?
  • Export settings, is the Use hardware encoder option checked or unchecked?
  • Filters used