Translations:Archive:Kdenlive/Manual/Transitions/11/en
You should preview your transition to make sure it is running in the direction you expect. For example, if it is a Dissolve transition and it is running in the correct direction, then the first clip should dissolve into the second clip. But if it is in the wrong direction, the first clip will suddenly disappear (replaced by the second track). It will then fade back in and abruptly jump to second clip. If your transition is in the wrong direction, just select the check box in the Transition tab.