Final Cut Pro out-transitions cut to black at the beginning instead of transitioning
I've been using FCPX for 12 years, but have always been frustrated by transition behaviors at times. Today's the day I'm going to ask the brain trust here why this happens. Often when I use an out-transition, instead of what I expect to happen — the clip in question is supposed to transition to nothing — it will chop to black at the beginning of the out-transition instead. No transition at all. I've made a screen capture here to demonstrate the problem. I've been working all day to find a work-around, and it remains elusive. Yes, I've deleted prefs, tried making a compound clip, restarted, and even reset the NVRAM.
The clip I'm trying to transition out of in this case has an alpha channel, but I've gotten this at times with every other type of clip with no seeming rhyme or reason. Sometimes it happens, sometimes it doesn't. Here's the video I made to illustrate the problem:
Notice that I've placed a green element underneath to show that the transition makes an otherwise transparent area opaque black at the beginning of the out-transition. And the last time through I remove the transition so you can see that the alpha is working during that stretch.
There's something fundamental I don't understand about FCPX transitions and never have. Can someone please tell me what I'm doing wrong here?
iMac Line (2012 and Later)
