Well this is first flight with the P4P.... along with the long list of issues posted on these forums I have to add this, 120 FPS H265 - dropped frames black frames, Pixelization.
Using the SanDisk Extreme Pro 64GB. My 4K recording appear fine with no glitches but i will go through them frame by frame and it records at the same bitrate. I went against my word and became again, another beta tester for DJI. They rushed this product out the door....of
at least 14 dropped frames to black and about 5 frames of pixelization after. Also a gimbal twitch and the horizon is way off most of the time. Cold IMU calibration at -20c... gimbal calibration bla bla bla.
00:24:06 - Black
00:30:06
00:48:05
00:54:05 Gimbal Glitch
01:17:13 Black
01:23:13
01:47:13
02:11:14
02:29:14
03:23:16
03:29:16
03:53:16
03:59:15
04:17:19
05:11:19
Video available for download here              

Update- tested with the Sandisk Extreme Plus and Extreme cards and both are dropping frames. These cards have write speeds of 90 and 60 MB/s write speeds. I will test with Lexar 600x card later this week. Is it possible there is a compatibility issue with Sandisk cards?

epicjib Posted at 2017-1-2 09:44
Update- tested with the Sandisk Extreme Plus and Extreme cards and both are dropping frames. These cards have write speeds of 90 and 60 MB/s write speeds. I will test with Lexar 600x card later this week. Is it possible there is a compatibility issue with Sandisk cards?

Just Purchased a new Lexar 64GB 1000X card and it is still dropping frames. Is it formatted as ex-fat and when in this format, the time stamp out on the file.
DJI so is this issue with the size of card, brand or is my drone just a lemon? Can others verify with a 64GB card at 120FPS @H.265
Thanks

I'm having a slightly different problem with P4 (not P4P) footage straight from SD card has artifacts, pixelated, stutters and breaks up randomly during playback on latest 2016 2.7GHZ 15inch MacBook ProT  (Touch Bar) with Phantom 4 latest firmware version 1.2.602, stock 16GB Panasonic Micro SD HC I Class 10 [3], 32GB SanDisk Ultra Micro SD HC I Class 10 [UHS 3] and 64GB Lexar 633X Micro SD XC I Class 10 [UHS 3] filming with stock settings such as Video format MOV, NTSC, White Balance Auto, Style None, Color None and several Video Sizes 4K 4096x2160 @ 24fps, 4K 3840x2160 @ 30fps and 2K 2704x2160 @ 30fps. I plan to step back P4 firmware until the problem is no longer present as It was not an issue in v1.1301 or v1.1.410... As I just recently made the jump straight to v  1.2.602. Wonder if it could be a firmware issue for you too?

Davejmedia Posted at 2017-1-11 18:23
I'm having a slightly different problem with P4 (not P4P) footage straight from SD card has artifacts, pixelated, stutters and breaks up randomly during playback on latest 2016 2.7GHZ 15inch MacBook ProT  (Touch Bar) with Phantom 4 latest firmware version 1.2.602, stock 16GB Panasonic Micro SD HC I Class 10 [3], 32GB SanDisk Ultra Micro SD HC I Class 10  and 64GB Lexar 633X Micro SD XC I Class 10  filming with stock settings such as Video format MOV, NTSC, White Balance Auto, Style None, Color None and several Video Sizes 4K 4096x2160 @ 24fps, 4K 3840x2160 @ 30fps and 2K 2704x2160 @ 30fps. I plan to step back P4 firmware until the problem is no longer present as It was not an issue in v1.1301 or v1.1.410... As I just recently made the jump straight to v  1.2.602. Wonder if it could be a firmware issue for you to? Have you tried the SD cards in another 4K capable recording device?

I have used these cards in my Panasonic GH4, P4 and GoPro Hero 4 without issues. Its not the cards.

epicjib Posted at 2017-1-11 21:15
I have used these cards in my Panasonic GH4, P4 and GoPro Hero 4 without issues. Its not the cards.

No, it is not the card, because an SD card cannot drop frames. If the card is too slow (not that any of the ones you have mentioned are), then they simply stop recording. Any black frames are caused in the video processing section and have to be present prior to recording. This suggests there is a problem in the aircraft.

Have you tried with H264 codec? Users are experiencing problems with the H265, particularly importing to adobe and other editing programs