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Delay time from cam to Display ?
802 11 2017-5-3
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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How long is the delay time from the cam via wifi to the display of the phone/tablet for normal? What factors are respondable for that time?
On my tab MPQC 96i the feeds need 10 -30 sec from the copter but the commands to the copter are uploaded in 1 sec only. Is the mass of data also a factor for that delay or not?
Thanks in advance.

2017-5-3
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DJI-Jamie
DJI team
Flight distance : 112405 ft
United States
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That seems like a long delay. Have you tried using a different mobile device?
2017-5-3
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Betamace
First Officer
Flight distance : 2133 ft
United States
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It's more a mobile device issue that varies with different brands and models of phones and tablets. Less than 2 gigabytes of ram in the device will give you a really noticeable delay before the screen updates. Video compression is less taxing on the gpu/cpu until the camera's POV changes.

Another cause for the long delay can be apps running in the background. This eats up available ram and if your cpu is using software video decoding it's like dragging your feet when you are walking.

I never got shorter than a 228 ms delay with my best android device until I started using a iphone 6s+.  The delay is noticeably less when using my iphone.


2017-5-3
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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I´ll try an iphone 5/6 and ipad to see the difference for delay time. Can i reduce the resolution for feed display in the go app ? and where i can do that?
2017-5-5
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Betamace
First Officer
Flight distance : 2133 ft
United States
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Peterx Posted at 2017-5-5 02:22
I´ll try an iphone 5/6 and ipad to see the difference for delay time. Can i reduce the resolution for feed display in the go app ? and where i can do that?

The video feed from the ac is already limited at 720p and the bit feed is fixed.

The delay you experience can be blamed solely on the mobile device not being capable of handling the amount of data being fed from the remote.
2017-5-5
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solentlife
Captain
Flight distance : 1087530 ft
Latvia
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Just to add to the info above ..

People get confused as to the actual communications route. The display (Android or IOS) only talks to/from the Controller. So all data / video and commands are via that link.

You will have a slight delay of video back to Controller from camera on the WiFi ... but usually this usually is not a problem unless you fly extreme range. The real problem comes as Betamace said - the display unit being overtaxed in processing all data coming into it from controller. Reason you need to shut down all unnecessary apps and items.

Nigel
2017-5-5
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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I will have a look in the settings of this tab,and try different ways. I think your tips can help.
2017-5-5
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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Now i have a reduced delay about 1 to 5 seconds trough a hidden setup menu. It´s an automatic task terminator. The Go app reacts more faster than before. Thanks for the tips. That was the 1st trail.
2017-5-6
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DJI-Jamie
DJI team
Flight distance : 112405 ft
United States
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Peterx Posted at 2017-5-6 10:43
Now i have a reduced delay about 1 to 5 seconds trough a hidden setup menu. It´s an automatic task terminator. The Go app reacts more faster than before. Thanks for the tips. That was the 1st trail.

Good to hear you were able to get some improvement.
2017-5-6
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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Today i did a roof inspection of my house,the delay time was constant 1 sec with loaded map. After that i was going to test it twice and without map the delay time was shorter than 1 sec. If i want to make clips the delay is not so important. But if i want to take photos then it´s very important. S2 was in the bottom position. May be this is also a factor to boost up the transmission.
Tomorrow i´ll test it more. THX
2017-5-15
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DJI-Jamie
DJI team
Flight distance : 112405 ft
United States
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Peterx Posted at 2017-5-15 11:21
Today i did a roof inspection of my house,the delay time was constant 1 sec with loaded map. After that i was going to test it twice and without map the delay time was shorter than 1 sec. If i want to make clips the delay is not so important. But if i want to take photos then it´s very important. S2 was in the bottom position. May be this is also a factor to boost up the transmission.
Tomorrow i´ll test it more. THX

Please keep us posted.
2017-5-15
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Peterx
Captain
Flight distance : 1496854 ft
Germany
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Today i did it again and got the same result as yesterday. May be i must cache the map in the internal SD card and not in RAM. I think the map inside RAM is not really small and eats much of it.
2017-5-16
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