I use an iphone 11 with the apple app and the video was unusable. i tried everything, what i noticed was that the recorded video was even more choppy than the stream. even with airplane mode on and blue tooth off the video sucked. Until i turned on Battery saving mode in the phone. Since doing this the recorded video is buttery smooth no dropped frames at all. Occasionally when i fly it into another room where i am not sitting, i will see a dropped frame in the stream but not in the recording. Not sure why this is such, but it has completely solved my issue. I suspect that either the i phone has more resources available to it to record in this mode and it is producing less internal electronic noise which in-turn improves reception.
Hope this helps some of you with similar issues
Hope this helps some of you with similar issues