Hello,
does anyone have an explanation for the following situation:
In my drone P4P, I have a 64 Gb memory card. I do a flight of 22 minutes during which I record all the flight in video.
At the end of the flight, I see that the video file is cut into 4.09 Gb files.
Why is not the entire flight saved in a single file?
I did not find the explanation anywhere.
Thanks for your help.

Videos are always auto split at about 4GB. There is no way to prevent that from occurring. You can join the video files later using a video editor.

Thank you very much for this explanation.
It is a pity that this is not documented in the user manual.

Hi, thanks for reaching DJI Forum. We do apologize for having issues with your DJI Phantom 4 Pro. The video will be split when the file's memory reaches 4 GB. Otherwise, the file cannot be recognized in FAT32 file system. When the file's memory reaches 4 GB, new files will be generated to store the split videos. In this way, some videos may be lost. It is a best practice to should estimate the time based on the video shoot. We will also optimize the system soon. Should you have more queries, don't hesitate to reach us. Thank you.

Thank you very much.
I just wanted to understand why it was so and you gave me the explanation.

That is across the board in  most video recorders. my GoPro, Camcorder, dash cam, all my drones, etc. It plays back seamlessly when you add both files to a video project.