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Video Transmission Lag [Situation Update - Fixed?]
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12781 88 2016-7-22
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DrawsWithLight.
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I thought resetting my iPad Air 2 had resolved the video transmission lag problem I'm having but it still presents itself. It usually happens when first starting up the drone but after a few minutes or so the  problem disappears. I've also tried it on my iPhone 6S and that doesn't help either. Last night I updated the drone to v1.9.60 and I've just been out to try it again. There was some video lag initially, about 3-4 seconds delay,  then after a short while everything was fine. I recorded the Transmission Signal screen as the bars were jumping around, not sure if this is normal.





Please help, not sure what to try next!
2016-7-22
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thomasneumann10
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Mine is similar, seems to be fine for the first minute or so then it goes really insanely laggy to where i cant use fpv. Im wondering if its the interference in my area or if it just happens. 9 out of 10 days
2016-7-22
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MSGNitro
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What kind of temperatures are you flying in?
2016-7-22
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thomasneumann10
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I live in florida. so it gets hot, maybe in 90s high humidity
2016-7-22
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DrawsWithLight.
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thomasneumann10 Posted at 2016-7-22 20:02
I live in florida. so it gets hot, maybe in 90s high humidity

Was 25 deg C today
2016-7-22
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DJI-Ken
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What device are you using, make sure you have no apps running in the background.
Also do you have Hardware Decode enabled.
You can choose custom and select the best channel (shortest line) and lower the bitrate.
Also proper antenna orientation is key.

2016-7-22
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DrawsWithLight.
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DJI-Ken Posted at 2016-7-22 21:57
What device are you using, make sure you have no apps running in the background.
Also do you have Ha ...

iPad Air 2 and tried it on iPhone 6S too, I can't change the Channel, I guess because of being based in UK. All background apps were shut down and hardware encode enabled. The problem only began after recent app updates.
2016-7-23
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Geebax
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DrawsWithLight. Posted at 2016-7-24 06:24
iPad Air 2 and tried it on iPhone 6S too, I can't change the Channel, I guess because of being bas ...

If the control system is constantly changing channels, then there is your problem. The radio channel will change channels if it encounters another transmission on the same channel it is using, this is quite normal and is exactly what it is designed to do. As a result, the MPEG coded video stream is interrupted and has to start decoding at the RC end all over again, and when it does this, the image is delayed. Again, that is perfectly normal with MPEG coding systems. The best way to avoid the problem is to fly where there is no radio inrterference.
2016-7-23
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DrawsWithLight.
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Geebax Posted at 2016-7-23 23:37
If the control system is constantly changing channels, then there is your problem. The radio chann ...

Thanks for that Geebax, I'll bear this in mind next time I'm out. However, I was out last Thursday and had the video lag issue, I checked the Transmission Signal screen and there weren't any bars showing at all, I was pretty much in the middle of nowhere (see Google Maps Extract, Wharram Percy). I guess being in the middle of nowhere doesn't necessarily mean there isn't interference but would the bars be jumping around if there was?

2016-7-24
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Geebax
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DrawsWithLight. Posted at 2016-7-25 05:44
Thanks for that Geebax, I'll bear this in mind next time I'm out. However, I was out last Thursday  ...

It depends upon the amount of lag you get. Virtually all video broadcasting systems rely on MPEG encoding, as does thre Phantom. One of the characterisitics of MPEG is that in order to obtain the best compression, it checks to see if the image is changing much from one frame to the other. If not, it simply encodes a message of 'essentially the same as the last frame'. In order to do this, it has to delay the encoding process, and that is what you see as lag. You can get the same effect if you have two television sets in the same room tuned to the same channel, often one will be delayed beghind the other. So, in summary, a small amount of lag (ip to 1/2 second) is perfectly normal.
2016-7-24
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DrawsWithLight.
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Geebax Posted at 2016-7-24 23:40
It depends upon the amount of lag you get. Virtually all video broadcasting systems rely on MPEG e ...

The lag can be as much as about 4-5 seconds
2016-7-24
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Geebax
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DrawsWithLight. Posted at 2016-7-25 08:59
The lag can be as much as about 4-5 seconds

Yeah, that can also mean your iPad is taking its time to process the images, and so is the Go App. Have you got hardware acceleration switched on on your iPad?
2016-7-24
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-24 04:24
iPad Air 2 and tried it on iPhone 6S too, I can't change the Channel, I guess because of being bas ...

I have an iPad Air 2 and I have no problems at all.
Something has to be wrong if you have a 4 second delay.
You can search the internet and you can have the Custom channels and also lower the bitrate.
And antennas are pointed correctly as in the video?
If you cannot remedy it with trying another device then you may want to contact support and have it sent in for repair.
The area you are flying iin should have no problem at all.
2016-7-24
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DrawsWithLight.
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Geebax Posted at 2016-7-25 01:06
Yeah, that can also mean your iPad is taking its time to process the images, and so is the Go App. ...

Yep, tried it on and off
2016-7-25
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DrawsWithLight.
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DJI-Ken Posted at 2016-7-25 05:03
I have an iPad Air 2 and I have no problems at all.
Something has to be wrong if you have a 4 secon ...

Thank you, I'll look into custom channels. Antennas are OK, I have been using the drone since March with no issues until the latest app/firmware updates.
2016-7-25
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-25 16:41
Thank you, I'll look into custom channels. Antennas are OK, I have been using the drone since Marc ...

The last update put all the GEO data and that may be why the data is slower.
I notice my iPad Air 2 has perfect transmission, just the map page is a touch slow. My iPad Pro has no delay at all.
2016-7-25
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Baldo81
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Hi,

starting few months ago I started to face the lag you described as well. I even bought a new IpadMini 4 to see if the problem was because of the device. What I notice is that the lag sometimes starts when I switch from photo mode to video mode.

Hardware decoding is on, custom channel with lowest bitrate selected and original ipad's cable.

I'm not going to update to the last fw and last GEO app (I'm at fw 1.8.80) as I'm worried that things go worse..
2016-7-25
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DrawsWithLight.
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DJI-Ken Posted at 2016-7-25 15:16
The last update put all the GEO data and that may be why the data is slower.
I notice my iPad Air  ...

I've managed to switch the region to US and have tried manually selecting channels and lowering bit rate but it doesn't help. In fact, being able to adjust bit rate has highlighted that I've been getting a poor transmission image for a while now!

See video of lag below, the controller was 1m or so away from the drone. When I initially powered up the drone the lag was about 5 seconds but I guess the app lowers the bit rate  while it's calibrating itself, but still, there is significant lag and drop out!


2016-7-26
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-26 16:54
I've managed to switch the region to US and have tried manually selecting channels and lowering bit ...

If you have the antennas pointing correctly and have all background apps OFF then you should not be seeing that lag. The advertised latency is 220ms with a proper device (which you have) and interference free (which looks like you are in).
You can to reinstall the firmware or even try going back one to see if it helps but not sure it will
I would contact support and have it sent in.
2016-7-26
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Baldo81
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do you get this lag also with other APPs? have you tried?
Because I've the same problem and I noticed that it's laggy also with litchi.
It happens with the first flight usually and if I land and re-power everything the lag goes away (both with DJI go and litchi).
It's very strange.
I'm using an ipad mini4
2016-7-26
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DrawsWithLight.
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DJI-Ken Posted at 2016-7-26 15:00
If you have the antennas pointing correctly and have all background apps OFF then you should not b ...

Thank you Ken, I'll try downgrading firmware and if no joy I'll get in touch with support
2016-7-26
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DrawsWithLight.
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Baldo81 Posted at 2016-7-26 15:02
do you get this lag also with other APPs? have you tried?
Because I've the same problem and I notic ...

I've not tried any other apps, just DJi Go on iPad and iPhone
2016-7-26
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-26 22:32
Thank you Ken, I'll try downgrading firmware and if no joy I'll get in touch with support

Since it happened after upgrading, it could be one of the data packets got corrupted and have done something to your video transmission module.
So try the downgrade and go fly, it it's all better then upgrade again to see if it's gone (should be). And if not you can stay on the lower firmware or send it in. I would send it in just so there will be no issues at all.
2016-7-26
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-26 22:32
I've not tried any other apps, just DJi Go on iPad and iPhone

Possibly try an Android device or another IOS device too just to try and eliminate things.
2016-7-26
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Baldo81
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DJI-Ken Posted at 2016-7-26 22:45
Since it happened after upgrading, it could be one of the data packets got corrupted and have done ...

Ken, can IMU calibration help?
and in my case, as I'm facing this problem during the first flight (if I land and restart after the few mins of flight I don't usually have lag) and it's almost 3-4 months or more where I updated various time the PH3ADV could be that this problem of corrupted data packets passed thru one fw to the next updated one?
2016-7-26
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DJI-Ken
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Baldo81 Posted at 2016-7-26 23:00
Ken, can IMU calibration help?
and in my case, as I'm facing this problem during the first flight ...

I don't think an IMU calibration is going to help with video lag.
First thing is to make sure you have the antennas pointed correctly as I posted a video earlier in this thread.
I do find it strange that it's only with your first flight.
I would also try the firmware thing i described earlier. You have a Mini 4 and all correct settings so you should not have any lag whatsoever.
2016-7-26
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Baldo81
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DJI-Ken Posted at 2016-7-26 23:07
I don't think an IMU calibration is going to help with video lag.
First thing is to make sure you  ...

thanks, antennas are well positioned and when I fly I pay attention how I put the remote and I face always the PH3. I hadn't range issues (I flew >3km in custom mode with no lag or problems).

I can't downgrade as I'm with fw 1.8.80 (or can I?) and till now I never had any issue with fw updates.
Is it only a fw downgrade that can fix the corrupted data packets problems? or even when we update?
2016-7-26
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DrawsWithLight.
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DJI-Ken Posted at 2016-7-26 15:45
Since it happened after upgrading, it could be one of the data packets got corrupted and have done ...

Thank you. I have just been trying to pin down when I first started to experience the transmission delay; 20th June 2016 was the first time I recall it happening, some time after upgrading the firmware to 1.8.80 and before I updated to 1.9.60. I'm guessing it's not the firmware causing the issue.

I did (as had others) have initial image transmission problems on an app update several weeks ago, but a subsequent app release seemed to cure it. I cant remember what dates they were released, maybe you could advise?

PS I've also tried it on my iPhone 6S and it didnt help either.
2016-7-26
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DJI-Ken
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Baldo81 Posted at 2016-7-26 23:14
thanks, antennas are well positioned and when I fly I pay attention how I put the remote and I fac ...

Try upgrading to 1.9. I don't know if it's corrupted data packets, that was only a suggestion if the lag started immediately after a firmware upgrade.
Upgrade to 1.9 and see if it still persists.
2016-7-26
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DJI-Ken
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DrawsWithLight. Posted at 2016-7-26 23:21
Thank you. I have just been trying to pin down when I first started to experience the transmission  ...

That's my advice, try downgrading then upgrading and another device. if you see the same results then you should contact support and send it in to be evaluated.
2016-7-26
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thomasneumann10
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I had same issue as you and took off gimbal unplugged and replugged itback in and it fixed my problem. I was having the issue for over a month.

I was trying everything nothing worked, i unplugged the two camera wires (after taking gimbal off) plugged them back in than boom it worked right away. IDK if one was loose or if it just reset the camera.

Please let me know
2016-7-26
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Baldo81
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thomasneumann10 Posted at 2016-7-26 23:32
I had same issue as you and took off gimbal unplugged and replugged itback in and it fixed my proble ...



Are you talking about these connectors? Is it needed to remove completely the gimbal?
2016-7-26
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DJI-Ken
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thomasneumann10 Posted at 2016-7-26 23:32
I had same issue as you and took off gimbal unplugged and replugged itback in and it fixed my proble ...

That's great, unplugging doesn't do any kind of resetting. Somehow it came loose. There's clips on the plug so it should not come loose.
2016-7-26
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DJI-Ken
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Baldo81 Posted at 2016-7-26 23:58
Are you talking about these connectors? Is it needed to remove completely the gimbal?

Those have to be the cables.
Those should be tight but you can try to press them in firmly but it shouldn't make a difference as thee's locking tabs on the clips.
2016-7-26
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thomasneumann10
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Yes those connectors. I suppose mine must of came loose then? mine drone is about 2 months old and was only flown 4 times (for the length of battery) and my problems were exactly as listed here. I was talking to support when they kept reccomending things that ive already done. I then tried unplugging gimbal and unplugging/replugging those two wires in and it worked. I also made sure the wires were firmly into the little plastic connectors.

But as of now this has honestly fixed it when everything else has not done a thing.
2016-7-26
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UCLABruins
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http://uavdoc.com/2016/phantom-3-advanced-video-lag-fixed/7/
2016-7-26
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thomasneumann10
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Interesting Bruins
2016-7-26
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DJI-Ken
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thomasneumann10 Posted at 2016-7-27 00:26
Yes those connectors. I suppose mine must of came loose then? mine drone is about 2 months old and w ...

That's good to hear. Glad it's all fixed.
2016-7-26
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Baldo81
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UCLABruins Posted at 2016-7-27 01:40
http://uavdoc.com/2016/phantom-3-advanced-video-lag-fixed/7/

really interesting! thanks for sharing.
Did you write this?

Were you facing lag all the time? or was it stopping at sometime?
2016-7-27
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Baldo81
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thomasneumann10 Posted at 2016-7-26 23:32
I had same issue as you and took off gimbal unplugged and replugged itback in and it fixed my proble ...

Yesterday I unplugged and then plugged again the 2 cables.
I just tested once (1 battery during 10min) today and I've have to say that no lag at all appeared (same spot same everything)... fingers crossed, I cannot say it's solved as I've to try testing more times... but so far so good..
2016-7-28
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