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AUTO EV & LOCKED EV - JUMPS
371 30 11-28 10:54
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InspektorGadjet
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Hello comunity,
After reading another post regarding "pulsing in video" I've decided to go and test it myself.
I found that the pulsating effect mainly noticed in vegetation happens in AUTO EV aswel as LOCKED EV. Is like the systems locks and then tryies to compensate, about each second it goes back creating that "jump" effect in middle tones, is noticeable in other areas too.

I grabbed the two clips where I could see it better, however after uploading to google drive and watching the footage in a tablet is harder to see, hopefully you can reproduce the error.

First clip is in auto mode:
https://drive.google.com/open?id ... 7GqWmDlu5DSU5KLSEOk

Second clip with exposure locked:
https://drive.google.com/open?id ... Nr9XHCh6Zs9mvRARTf_

The other related post where I found out is the following:
https://forum.dji.com/forum.php?mod=viewthread&tid=203092

11-28 10:54
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Nebuchadnezzar
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Just checking Videos !!
11-28 12:10
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hallmark007
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Is it change in iso ?
11-28 12:18
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InspektorGadjet
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hallmark007 Posted at 11-28 12:18
Is it change in iso ?

Maybe, it seems one of the variables is trying to catch up. ISO, WB, or shutter speed
11-28 13:00
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InspektorGadjet
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Nebuchadnezzar Posted at 11-28 12:10
Just checking Videos !!

Nothing Fancy, uploaded this one to show the "auto/ev" thingy
I have some footage, but I need to upload it.
11-28 13:05
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DAFlys
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If you turn on captions, does that give any clues to the settings?
11-29 01:45
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InspektorGadjet
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DAFlys Posted at 11-29 01:45
If you turn on captions, does that give any clues to the settings?

Hello, whatdo you mean by "captions" the "video subtitles" mentioned in the APP?
11-29 02:08
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DAFlys
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InspektorGadjet Posted at 11-29 02:08
Hello, whatdo you mean by "captions" the "video subtitles" mentioned in the APP?

Yes the video subtitles
11-29 02:38
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ARTPiranha
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I have the same issue with jumping brightness every some frames! It reminds me to the same problem with mavic pro original! There was the same on every 8th frame
11-29 02:48
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InspektorGadjet
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ARTPiranha Posted at 11-29 02:48
I have the same issue with jumping brightness every some frames! It reminds me to the same problem with mavic pro original! There was the same on every 8th frame

Interesting to know thanks!
Was that eventually fixed with FW updates?
Thanks in advance!
11-29 04:11
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InspektorGadjet
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DAFlys Posted at 11-29 02:38
Yes the video subtitles

Are they suposse to help?
I cannot find any info regarding the video subtitles, what are they, what info is supossed to show etc.
I will turn them on next time, and see what it shows, but this is something related to how the camera is locking the exposure.
11-29 04:19
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DAFlys
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InspektorGadjet Posted at 11-29 04:19
Are they suposse to help?
I cannot find any info regarding the video subtitles, what are they, what info is supossed to show etc.
I will turn them on next time, and see what it shows, but this is something related to how the camera is locking the exposure.

On the mini they will be embedded, so use something like VLC to see them,  the captions usually include camera settings, location, speed etc so it might show you that the shutter is changing between shots.
11-29 05:09
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ARTPiranha
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InspektorGadjet Posted at 11-29 04:11
Interesting to know thanks!
Was that eventually fixed with FW updates?
Thanks in advance!

its still there I suppose
11-29 07:17
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InspektorGadjet
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DAFlys Posted at 11-29 05:09
On the mini they will be embedded, so use something like VLC to see them,  the captions usually include camera settings, location, speed etc so it might show you that the shutter is changing between shots.

Will try that, but I don't think there is any indication of shutter speed changing, if it is related to shutter sped I think could be fixed in firmware, but otherwise is more likely the ISO, WB or something else.
We will se with more tests and hopefully some sort of info from DJI.
11-29 13:18
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InspektorGadjet
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ARTPiranha Posted at 11-29 07:17
its still there I suppose

That's not cool, I hope the MINI is a different matter and can be adressed.
11-29 13:19
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UltraONE
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I guess the guys from DJI can tell us something about their solution to this problem? This is a really serious problem for many of us.
11-30 04:37
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InspektorGadjet
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UltraONE Posted at 11-30 04:37
I guess the guys from DJI can tell us something about their solution to this problem? This is a really serious problem for many of us.

Yes, really looking forward for a solution from DJI support guys. I'm not sure why there seems to be no answer to this matter, maybe they know, maybe they aknowledge it and will be silently fixed... who knows.
I've been doing tests and it seems to happen in darker areas, in a full light scenatio is impossible to see.
11-30 04:39
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UltraONE
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Yes, I agree with you. I noticed this effect is noticeable on dark areas on a cloudy day.
11-30 04:43
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InspektorGadjet
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UltraONE Posted at 11-30 04:43
Yes, I agree with you. I noticed this effect is noticeable on dark areas on a cloudy day.

Yes. Specially cloudy environments or shadow areas.
I wonder if the Mini has some sort of control over shadows and highlights, this could explain how is trying to lift the dark areas or something and the rest is not affected as much.
11-30 04:51
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UltraONE
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I truly believe that this is a software problem, and the solution to this problem is completely on the side of the guys from DJI.
DJI is still silent.
11-30 07:18
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InspektorGadjet
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UltraONE Posted at 11-30 07:18
I truly believe that this is a software problem, and the solution to this problem is completely on the side of the guys from DJI.
DJI is still silent.

Yeah it totally looks like SW based, really looking forward to any sort of answer from support...
11-30 07:29
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Pavel 2
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InspektorGadjet Posted at 11-30 07:29
Yeah it totally looks like SW based, really looking forward to any sort of answer from support...

I believe what you are seeing is a known artifact of imperfect video coding caused by accumulated error in GOP sequence that becomes visible on next I frame (because the error vanishes suddenly). The "breathing" occurs in your video at slightly more than one second distance (take a loudly ticking clock to see for yourself) and this well correlates with the fact that I frames in this video occur every 30 frames (while the video is 25 fps). You can see frame types by running:
ffprobe.exe -select_streams v -show_frames -show_entries frame=pict_type -of csv DJI_0057_EV_LOCKED.MP4
(you will also see that there are only I and P frames and no B frames which is sad).

The video with waterfall that you gave a link to is 30 fps and the "breathing" there occurs exactly each second while the I frames distance is again 30 frames so this supports my guess.

Unfortunately, video encoding in low-power CPUs (Mavic Mini has Ambarella H22) is usually performed by certain hardware, not software, so I would not count on firmware fix in the future.
11-30 13:01
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InspektorGadjet
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Pavel 2 Posted at 11-30 13:01
I believe what you are seeing is a known artifact of imperfect video coding caused by accumulated error in GOP sequence that becomes visible on next I frame (because the error vanishes suddenly). The "breathing" occurs in your video at slightly more than one second distance (take a loudly ticking clock to see for yourself) and this well correlates with the fact that I frames in this video occur every 30 frames (while the video is 25 fps). You can see frame types by running:
ffprobe.exe -select_streams v -show_frames -show_entries frame=pict_type -of csv DJI_0057_EV_LOCKED.MP4
(you will also see that there are only I and P frames and no B frames which is sad).

Wow!
Thanks for the super detailed information, loud and clear.
It seems like under good light scenarios the effect is almost invisible, but once you see it... is always there.
11-30 13:10
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DJI Paladin
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Hi. I am sorry for the trouble and thank you for reaching out. I will be forwarding this thread/concern to our designated DJI department for further attention. Thank you for your valued support.
12-2 10:54
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InspektorGadjet
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DJI Paladin Posted at 12-2 10:54
Hi. I am sorry for the trouble and thank you for reaching out. I will be forwarding this thread/concern to our designated DJI department for further attention. Thank you for your valued support.

Finally support! Thanks.
I hope the designeted DJI department don´t have too much work lol
We are all trying to fine tune the Mini to be the best it can be.
Peace out.
12-2 12:36
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UltraONE
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Dear DJI, do you have news for us?

We have Serious problem.
Pulsation of video is noticeable already when shooting on a bright sunny day.
This "pulsating" makes the video unused (!) .

Pavel 2 - спасибо за развёрнутый ответ
12-3 13:06
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InspektorGadjet
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UltraONE Posted at 12-3 13:06
Dear DJI, do you have news for us?

We have Serious problem.

I also need some answers, today I noticed some shake for the first time, it was 10 degrees celsius outside andmaybe 18 inside the house, it didn´t had time to aclimatate to the environment so it may have an effect like I saw on another video.
12-3 13:15
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vdefilippo
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Here's another test. I'm the guy who made the first post that you saw.

I still see the pulsing on full auto mode. It's pretty obvious:

https://drive.google.com/open?id ... Mn1u2YGnsAOD_r8E1Ft
12-4 10:03
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InspektorGadjet
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vdefilippo Posted at 12-4 10:03
Here's another test. I'm the guy who made the first post that you saw.

I still see the pulsing on full auto mode. It's pretty obvious:

Hello,
Read the answer from Pavel 6 comments above this one.
It seems to be a hardware issue and it may be hard or impossible to fix with FW update.
We will see.

12-4 10:16
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vdefilippo
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InspektorGadjet Posted at 12-4 10:16
Hello,
Read the answer from Pavel 6 comments above this one.
It seems to be a hardware issue and it may be hard or impossible to fix with FW update.

Yeah, I saw that reply. But I'll wait to see what DJI says.
12-4 11:03
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InspektorGadjet
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vdefilippo Posted at 12-4 11:03
Yeah, I saw that reply. But I'll wait to see what DJI says.

Absolutely, is very annoying and evident in trees, and there are tons of those around me.
Dji support please shine a light on us, and we will eventually shut up lol
12-4 11:08
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