To manually add subtitle delay in VLC, do the following: Step 1. Play the video and pause it where the synchronization is off. Step 2. Go to Tools in the menu bar and select Track Synchronization. Step 3. Under the Subtitles/Video tab, adjust the Subtitle track synchronization by entering a positive or negative time value to delay or speed up the subtitles, respectively. Step 4. Click Close when you're satisfied with the synchronization.