I would swear I've had transitions from one file to the next that were seamless, but the last couple of times that my video was over 9 min 21 seconds (which is where the file reaches 4 GB for me), the transition to the next file was very jerky.
So I says to myself hey, didn't you recently switch the card that you were using in your X-Star with the card you were using in your P3P? Yep, I answer.
Well, turns out that the card that used to be in the P3P was 64 GB and now it's 32 GB.* But, the new videos start after 4 GB with either card. Does this mean that I'm going to find out that P3P supports exFAT for cards over 32 GB**, and that exFAT produces a smooth transition that doesn't require the video all to be in one file?
I'll let you know when I've found confirmed answers to those questions.
*Edit: No, they're both 64 GB but one is Sandisk Ultra Class 10 (that's the one I've gotten the jerky transitions from when installed in my P3P) and the other is Netac, Class U3. I'll switch the cards back and see if the Netac creates a smooth transition between files, tomorrow, in my P3P.
**Yes, according to page 54 of the P3P user manual.
Edit #2: I'm getting the jerky transition between video files no matter which 64 GB card I use in my P3P, and even though the P3P software is, according to the owner's manual, capable of using the exFAT filing system on cards over 32 GB in capacity. Confirmed with both cards during flights yesterday and today. Now, if there's a way to keep the video from splitting at 4 GB that I don't know about, that would of course change things.