• Please make sure the file you convert is not corrupted.

  • Try to play it in the program preview from the beginning to the end.

  • If it plays alright all the way through, then try to change the output directory and output format.

  • You can try disabling the currently active accelerations on the menu Settings - Preferences - Accelerations.

  • It is also recommended to check whether your graphic card drivers are up-to-date