Sorry for my English. I have problems when creating slow motion and fast motion video.
After I cut the scene audio (mp3 format) and video (1920x1080 60 fps) tracks, I add a "speed control" effect strip, uncheck "stretch to input strip length", set "speed factor" to 1 and "multiply speed" to 2 (for fast motion).
Then, I set frame window and when I right click the audio strip click audio choose waw click mixtap.
When I try preview all my video clip is lagging: if I click animate, the result is perfect, but I can't create another scene, because preview is laggy; I can upload video if needed, but I'm not sure which button is that, or code sample, or Hyperlink. Thank you for your time and thanks for reading my broken English.