Thanks Borate for reviewing my project and sending me the project back. You gave me an idea of what to look at with this video. The video was recorded with an iPhone held in a way that caused the video to be recorded vertically and then different software corrects for this by rotating the video later for play back. I think that is what is happening...?
Just an update on what I've done: When I export from the project you sent back as mp4 @9:16 1080p, there are a few things different listed in the Mediainfo:
Format profile: Main@L5.2
Format settings: CABAC / 3 Ref Frames
The format profile is being changed to Main@L5.2. I need to read more on the format profile and understand what impacts that setting.
I even tried converting the orignal MOV file using Prism Plus to a mp4 before importing the video into VP (VideoPad). The converted output mp4 file from Prism Plus has Mediainfo listed as 16:9, 1920*1080, High@L4, but when I import the converted mp4 into VP it shows 1080x1920 (9:16). I took the exported video mp4 from Prism Plus imported to VP, rotated video 270 degrees, added to timeline and then exported that video from VP, the format profile is Main@L5.2, 1920*1080.
Am I on the right track that video resolution is the key factor on VP setting the format profile setting?