Hi guys sorry in advance for my english, i'm writing from Italy.
I recently bought a Mavic Air Fly More Combo and in this days i'm doing (trying) some shots near my house, just for fun, just to learn to use it
Sometimes i used a friend's mavic pro and now with my Mavic Air i notice one thing.
When i move the aircraft forward or back or also when i rotate left/right i notice that the videos are choppy, i don't now the right word in english.
I know you have to move slowly, i think it is slow enough. I hope so.
I watched some videos on youtube and I think that I understand the rule of shutter speed double of frame rate so i bought a polar pro nd filter on amazon (nd4 + nd8 + nd16 kit)
In this days i record some videos in 4K 24 or 30fps, MP4, D-Cinelike, 0, -3, -2, it was a sunny day and i used a nd16 filter but the shutter speed was 1/80 or 1/100 (i don't have nd32), so it wasn't exactly the double of frame rate.
I upload some parts of video on google drive, the links are below. Can you tell me if i'm doing something wrong or if i have to change something?
Thank you guys

Link1
https://drive.google.com/open?id=14xpScWRcX_mScfdxubNLoCpDV4u9Q3fy

Link2
https://drive.google.com/open?id=1b-wamhcfejgewtuN3vaX_5vkRq2oPkzt

Have you tried the quick mode 'cinema' or 'tripod'  ?  If not try those and see if you have the same problem .  If that helps the problem then you can adjust the sensitivities for the various control inputs under the EXP settings.  

Dakar Enduro Posted at 7-14 08:08
Have you tried the quick mode 'cinema' or 'tripod'  ?  If not try those and see if you have the same problem .  If that helps the problem then you can adjust the sensitivities for the various control inputs under the EXP settings.

Thank you for your answer.
Next time i’ll try cinema and tripod mode and i’ll give  you a feedback.
Thanks

I wonder if your SD card is fast enough? It's seems more like frame dropping.

ririlan Posted at 7-14 09:32
I wonder if your SD card is fast enough? It's seems more like frame dropping.

I use Sandisk Extreme Pro 64gb. Speed trasfer is 70/80 mb/s

It looks like frame skipping to me.
Did you do anything to this file (render it in software).
Possibly in the wrong framerate?

Montfrooij Posted at 7-14 11:02
It looks like frame skipping to me.
Did you do anything to this file (render it in software).
Possibly in the wrong framerate?

I only opened the file with vlc media player and saved a part of it, nothing else

JohnSnow Posted at 7-14 11:24
I only opened the file with vlc media player and saved a part of it, nothing else

That might be your problem.
If you want, can you share the original MOV file?
I'm curious if the skipping is present in that too.

Montfrooij Posted at 7-14 11:46
That might be your problem.
If you want, can you share the original MOV file?
I'm curious if the skipping is present in that too.

The problem is also on the original clip.
On the DJI_0057.MP4 is more visible.
Is there any difference between mp4 and mov? My files are .mp4

Original file links:
DJI_0055
https://drive.google.com/open?id=1h5SgVgiyEwPm1bhUaEResrvHhjIHFVy1

DJI_0057
https://drive.google.com/open?id=1letFN4Ve6ZA7DtYXcSe5mN_2jppKYqd5

JohnSnow Posted at 7-14 12:22
The problem is also on the original clip.
On the DJI_0057.MP4 is more visible.
Is there any difference between mp4 and mov? My files are .mp4

There is basically no difference between MP4 and .mov MP4 = windows .MOV = Mac.
I use both since i'm using both PC and Mac, there might be different decoders in the editing phase but since you only watched it with VLC that should not matter at this stage.

Watched the first clips now and the term I would for this is stutter´.  I don't think your speed on the drone is the problem here since it looks like smooth flying to me.
When you YAW (ie move to the side), there might be some problems based on speed at least on the Mavic Pro.

Hope you got it solved,

Flybee Posted at 7-14 12:32
There is basically no difference between MP4 and .mov MP4 = windows .MOV = Mac.
I use both since i'm using both PC and Mac, there might be different decoders in the editing phase but since you only watched it with VLC that should not matter at this stage.

Those clips are 4K 24fps, but i have also other videos recorded using quickshot  “rocket” or “dronie” (4K 30fps) that have same problem.
The hard drive is a ssd Samsung 840 evo.

JohnSnow Posted at 7-14 12:48
Those clips are 4K 24fps, but i have also other videos recorded using quickshot  “rocket” or “dronie” (4K 30fps) that have same problem.
The hard drive is a ssd Samsung 840 evo.

OK, can you try to swap SD card since you have two Aircrafts and see if there is any difference then?

ie, first check the SD card and see if makes any difference and after that continue to see if there is something wrong with the AC.

About the harddrive, googled it but not sure if it is a SSD or not?
I think it would be sufficient anyway since the problem is on your uploaded clips.

I would start with an other SD card and let us know if the problem persists.
BTW, there is nothing wrong with you english.

Flybee Posted at 7-14 12:59
OK, can you try to swap SD card since you have two Aircrafts and see if there is any difference then?

ie, first check the SD card and see if makes any difference and after that continue to see if there is something wrong with the AC.

Yes i can use another sd card but all my sd cards are SanDisk extreme pro 32-64-128 gb.
Next time i’ll use the internal storage of Mavic Air.
The hard drive is a SSD Samsung mz-7te250bw 840 evo 250gb, is 2013/2014 model.
Next days i’ll do some flights and send you the results.

Thank you guys for your help

You should try tripod mode...

Did you copy from the SD to a folder on your desktop first or did you do this directly from the SD card?

JohnSnow Posted at 7-14 12:48
Those clips are 4K 24fps, but i have also other videos recorded using quickshot  “rocket” or “dronie” (4K 30fps) that have same problem.
The hard drive is a ssd Samsung 840 evo.

Your issue is frame skipping.
That is caused (most likely) because a file is rendered in a different framerate than it was recorded.
That would at least be my first guess.

JohnSnow Posted at 7-14 12:22
The problem is also on the original clip.
On the DJI_0057.MP4 is more visible.
Is there any difference between mp4 and mov? My files are .mp4

Are these straight from the SD card?

JohnSnow Posted at 7-14 12:22
The problem is also on the original clip.
On the DJI_0057.MP4 is more visible.
Is there any difference between mp4 and mov? My files are .mp4

As long as you did not do any rendering (via a video editor) there is no difference between the two (at least not what would cause this issue).
So, of these files are straight from the SD card, that is ruled out.

Yes next time i’ll try tripod mode and Cinematic mode.

Yes, i moved the files from sd card to desktop and then i uploaded them on google drive.

I mean that i moved the files from sd card to desktop, i watched the files and noticed the problem. From desktop i cut a part of each file and upload on google drive.

JohnSnow Posted at 7-14 10:26
I use Sandisk Extreme Pro 64gb. Speed trasfer is 70/80 mb/s

Maybe the speed of Sandisk Extreme Pro is not enough? The recording speed of 4k for Mavic Air is 105 MB / s. Although, in my opinion, it is more like a frame drop during transcoding. You definitely shot not 30 fps? The files on the links frequency 24 fps.

As stated, use the internal storage. If the problem still exists there might be a failure with the drone, which I highly doubt. My guess is the SD card aswell.

There is also an assumption that the High@L5.1 profile is too heavy for real time. In the evening I will try to remake it into a lighter one, look at the smoothness of playback and accomplish your goal.

Vofas Posted at 7-15 00:45
Maybe the speed of Sandisk Extreme Pro is not enough? The recording speed of 4k for Mavic Air is 105 MB / s. Although, in my opinion, it is more like a frame drop during transcoding. You definitely shot not 30 fps? The files on the links frequency 24 fps.

Yes it could be but the sandisk extreme pro are in the recommended list.
I shot in 24fps because also my friend’s Mavic Pro shot in 4K 24 so i want to use the same settings for final editing. Am i wrong?

JohnSnow Posted at 7-15 01:27
Yes it could be but the sandisk extreme pro are in the recommended list.
I shot in 24fps because also my friend’s Mavic Pro shot in 4K 24 so i want to use the same settings for final editing. Am i wrong?

No, it should not affect. Although I prefer 30 fps. I still check your files in the evening at home and report the results tomorrow.

Here I am, again These are some random videos i made this evening. The sun, light and clouds were completely different than yesterday's videos.
I moved the AC very very slow, speed from 1 to 3km/h. Internal storage, no SD card.
I tried to record always in the same way..
In all of this videos:
White balance - cloudy (maybe i could use sunny)
Sharpness 0 Contrast 0 Saturation 0
D-Cinelike

DJI_0024
Cinematic mode , 4K 30 fps, 1/400, No filters
https://drive.google.com/open?id=1TSKQ6GNnPzhGpyDkmS4HmsswGubmZetC

DJI_0025
Tripod mode , 4K 30 fps, 1/400, No filters
https://drive.google.com/open?id=1p2sFXWE25XqgESIEOWts1bZNhCv0WeBT

DJI_0026
Cinematic mode , 4K 30 fps, 1/60, ND8
https://drive.google.com/open?id=14VKirmcMa2VvprIF5pR8QZwPY_apOp4N

DJI_0027
Tripod mode , 4K 30 fps, 1/60, ND8
https://drive.google.com/open?id=1mI0mrp5gN-Te4cAUTXdP8XQHYtKdJNA7

In my opinion, DJI_0024, DJI_0025 and DJI_0027 have always the problem..
DJI_0026 from 1.10 to 1.20 looks a little bit smooth, but the rest of the time isn't smooth..
I don't know but now i see all shaky

JohnSnow Posted at 7-15 12:15
Here I am, again These are some random videos i made this evening. The sun, light and clouds were completely different than yesterday's videos.
I moved the AC very very slow, speed from 1 to 3km/h. Internal storage, no SD card.
I tried to record always in the same way..

After recoding problem files with reduced resolution and bit rate, no jerks or brakes were observed while browsing. Thus, there are no missing frames in the source files. A small strobe in the image - a common phenomenon for video at 24 frames per second with progressive scan.
Link1
Link2

Vofas Posted at 7-15 21:31
After recoding problem files with reduced resolution and bit rate, no jerks or brakes were observed while browsing. Thus, there are no missing frames in the source files. A small strobe in the image - a common phenomenon for video at 24 frames per second with progressive scan.
Link1
Link2

Really? That’s a good news.
So it si only a “visualization problem”?

JohnSnow Posted at 7-16 13:01
Really? That’s a good news.
So it si only a “visualization problem”?

Yes. Video on my links proves it.

Vofas Posted at 7-16 21:25
Yes. Video on my links proves it.

Thank you so much. In the evening i’ll download your videos.
Probably even 30fps videos have this “visualization problem” ...
I have another question.
In this summer i will use some footage from the Mavic Air, Mavic Pro and GoPro Hero 7 Black. Mavic pro records in 4k 24fps (if I remember correctly), do i set everything to 24?

JohnSnow Posted at 7-16 23:42
Thank you so much. In the evening i’ll download your videos.
Probably even 30fps videos have this “visualization problem” ...
I have another question.

Yes of course. All video files used in the same project should have the same frame rate. In your case, 24 fps.

JohnSnow Posted at 7-16 23:42
Thank you so much. In the evening i’ll download your videos.
Probably even 30fps videos have this “visualization problem” ...
I have another question.

This problem does not depend on the frame rate. Just a video track is encoded with a codec that requires powerful computer resources for real-time display. Hence, jerks or slowdowns when viewing.

Vofas Posted at 7-16 21:25
Yes. Video on my links proves it.

Great!!
Thank you, thank all of you for your tips.
Now I just have to fly