What were you expecting to be different? How are you doing this test? Were you expecting the video to play faster? If so, that does not work the way you think.
The very first step for any project is to set the Settings > Video Mode . What frame rate have you set in your video mode? When the video mode frame rate does not match the clip frame rate, Shotcut will skip or repeat frames to make sure that the video appears to play at the original speed.
If you want the video appear faster, you have to apply a speed effect. Either change the speed in the clip properties panel, or add one of our “Speed” filters.