Matioupi
First Officer
Flight distance : 922569 ft
France
Offline
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I just did the following experiment to measure Spark video latency :
I take a small flashlight
The Spark is film the control device
The flashlight is next to control device as seen on attached picture
I'm filming the whole thing with an external device
Then I turn light on (cf. attached video sequence)
Repeat the sequence to be able averaging
In video editing software, I then count the number of frames it takes between first frame with the flashlight on, and the first frame with the "picture in picture" flashlight on
(this gives twice the frames latency). My external filming device is 29.97 fps, so latency in seconds is then "frame count" / 60
Some results : I've been doing the test (20 light on/off sequence for each setup) on my CrystalSky with :
Android DJI GO 4 4.1.14, OTG : 6 frames latency without any "peaks"
Android DJI GO 4 4.1.14 FCC mode, Wifi : 6.5 frame latency with regular peaks to 16-18 frames
Android DJI GO 4 4.1.18 FCC mode, Wifi, 11.5 frames latency with regular peaks to 26-29 frames
Would be nice if other users can do the test and share the reults with precisions on :
- control device model
- DJI GO 4 version
- OTG or no OTG
Also take care closing all non usefull apps to avoid unwanted extra delays...
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