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DJI Mini 4 Pro

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Re: DJI Mini 4 Pro

#401

Post by RhodesianHunter »

semanticist wrote: post #400
RhodesianHunter wrote: post #327

Earlier quoted context omitted.

I don't know how DJI works, but presumably it ships the video out to a service that you then log in to to view? If so, it's on their servers and there's no "networking" you can do to know whether they forwarded it on from there.

"I don't know" - so why leave a comment? Because you can doesn't mean you have to, especially when you don't actually have any knowledge on the topic at hand. (And, as people have pointed out, this is both a weird and incorrect assumption, adding nothing to the discussion other than confusion.)

Except that they do offer exactly that. No need to be so condescending.

https://www.dji.com/lightcut

Re: DJI Mini 4 Pro

#402

Post by RhodesianHunter »

9witz wrote: post #365
RhodesianHunter wrote: post #327

Earlier quoted context omitted.

I don't know how DJI works, but presumably it ships the video out to a service that you then log in to to view? If so, it's on their servers and there's no "networking" you can do to know whether they forwarded it on from there.

The DJI Mini Pro 3 works without Wifi and using the expensive controller, without a phone app, so the opportunities to upload captured data to China are very limited.

Unless you use their recommended software. https://www.dji.com/lightcut

Re: DJI Mini 4 Pro

#403

Post by regularfry »

Aurornis wrote: post #106
ramenmeal wrote: post #21

Streaming 1080p/60fps up to 20km wirelessly is mind boggling to me. What kind of tech is used to make that happen? seems like it'd require a lot of power.

The video quality degrades at longer distances. You can't get the full bandwidth at the maximum distance, but you might see enough to navigate. Communicating with a drone up in the sky is easier than something like your WiFi or your cell phone because you have a nice, clear line of sight to the drone. Fly behind a hill, building, or some trees at distance and the drone will lose connection and go into safety mode. Th…

The channels can't be too narrow bandwidth and still fit any sort of 1080p video feed in them. If I'm remembering my signals courses right, raw 1080p at 60fps would need something like 6GHz, so even at 100:1 compression they'd still need 60MHz channels.

Re: DJI Mini 4 Pro

#404

Post by RhodesianHunter »

pmx wrote: post #375
RhodesianHunter wrote: post #327

Earlier quoted context omitted.

I don't know how DJI works, but presumably it ships the video out to a service that you then log in to to view? If so, it's on their servers and there's no "networking" you can do to know whether they forwarded it on from there.

What a strange assumption to make. No it doesn't work like this at all. The video is saved to the SD card in the aircraft, which you then remove and insert it into your computer to download the files.

And potentially use their recommended software to work with from there: https://www.dji.com/lightcut

So not that many jumps from what I described.

Re: DJI Mini 4 Pro

#405

Post by amelius »

doix wrote: post #352
amelius wrote: post #342

Earlier quoted context omitted.

Are you saying that sound conduction doesn't behave linearly?

Wikipedia is actually a pretty good source for this [0]. tl;dr it's not as simple as one drone makes X noise, so 2 drones make 2x noise. For that to happen, the drones need to be making noise at the same frequency and be perfectly in phase. Also, if they were perfectly out of phase, they could cancel the noise from each other out (this is how noise cancelling headphones work). [0] https://en.wikipedia.org/wiki/Wave_i…

That's a long article. My intuition says that if a sound source produces a number of Watts per square meter, then those numbers should add up.

In fact that's what it says here:

https://personalpages.manchester.ac.uk/staff/richard.baker/B...

Of course assuming uncorrelated noise, as a crude approximation.

Re: DJI Mini 4 Pro

#406

Post by devit »

hackernewds wrote: post #248
devit wrote: post #216

Earlier quoted context omitted.

Is there any system that works for at least 10-20km without line of sight, supporting a video feed usable for guidance, without cell phone network coverage? Maybe something where there are two drones, and one flies high with line of sight to both the user and the low-flying drone so that it can act as a relay like a satellite would? Or something that uses radio frequencies that bounce over the atmosphere, and if band…

why does this read like tech that should not be reasonably legalized for civilian use

I think it would be very useful for scouting in woodland/backcountry use including search&rescue.

At 50 km/h, it moves 10-20 times faster than a hiker, and at But requiring line of sight is a strong limitation because it means that you need to fly over the tree canopy and might not see under it, and you need to fly really high if target is on the other side of a mountain or hill and again you might not see well.

And of course cell phone coverage is not guaranteed so you can't use the easiest solution of putting a cell modem on it.

Re: DJI Mini 4 Pro

#407

Post by Sebb767 »

cjbgkagh wrote: post #235
Bimos wrote: post #189

Earlier quoted context omitted.

Recently a Russian commander got killed because he shared his daily running route on Strava which was seen by the killer. https://edition.cnn.com/2023/07/11/europe/russian-submarine-...

I wonder if killing their dumber commanders might inadvertently be helping them…

Even steelmanning the argument, it probably doesn't. For one, commanders need some level of experience and training, you can't replace them for free. But more importantly, having a lower technically skill, which might open one up to inadvertently sharing their running route, probably does not correlate too much with the skills required to be a successful commander. Now, in general (hah), stupid people will probably both be more open to these kind of mistakes and be worse commanders, but being a good commander doesn't mean are not making minor opsec mistakes like this, so in the end you will still loose strategically valuable people.

Re: DJI Mini 4 Pro

#408

Post by yread »

brentm wrote: post #74

I always look at these and think I want one but also can't think of what i'd actually use it for. I just picture it sitting in a closet next to my GoPro and Oculus after about 3 days of messing around. Anyone own one? What do you use it for?

I got a 20eur knock off to check whether the gutters are full of leaves without getting the ladder. It kinda works.

The roof is at the 3rd floor and the ground is a bit uneven there so it's not just that I'm lazy ok?

Re: DJI Mini 4 Pro

#409

Post by jacquesm »

amelius wrote: post #405
doix wrote: post #352

Earlier quoted context omitted.

Wikipedia is actually a pretty good source for this [0]. tl;dr it's not as simple as one drone makes X noise, so 2 drones make 2x noise. For that to happen, the drones need to be making noise at the same frequency and be perfectly in phase. Also, if they were perfectly out of phase, they could cancel the noise from each other out (this is how noise cancelling headphones work). [0] https://en.wikipedia.org/wiki/Wave_i…

That's a long article. My intuition says that if a sound source produces a number of Watts per square meter, then those numbers should add up. In fact that's what it says here: https://personalpages.manchester.ac.uk/staff/richard.baker/B... Of course assuming uncorrelated noise, as a crude approximation.

Yes, but it isn't uncorrelated noise. That's the whole problem here. Long articles are long for a reason, in this case that this is a complex issue. And prop noise is an ideal candidate for such interference.

Re: DJI Mini 4 Pro

#410

Post by cjbgkagh »

Sebb767 wrote: post #407
cjbgkagh wrote: post #235

Earlier quoted context omitted.

I wonder if killing their dumber commanders might inadvertently be helping them…

Even steelmanning the argument, it probably doesn't. For one, commanders need some level of experience and training, you can't replace them for free. But more importantly, having a lower technically skill, which might open one up to inadvertently sharing their running route, probably does not correlate too much with the skills required to be a successful commander. Now, in general (hah), stupid people will probably b…

We disagree on the severity of the mistake, hiding information from adversaries is a core competency and a big part of training. Someone who failed to learn from that training has a low innate intelligence and even if trained is unable to use the training effectively and is a liability.

The CIA for example drills into their people this same information denial training but they appear to neglect randomness so you end up with a bunch of people with the same peculiar behavioral patterns so they’re ironically rather easy to detect if you have access to click stream data. For example, they’re told not to follow each other on social media, but they still interact so you end up with two people who freely follow lots of people who interact with each other frequently but don’t follow each other. It’s weird, I’m not saying everyone who does this is information hiding but you can extract networks of people who behave in this same weird way with each other.

In order to protect the enigma cracking secret the UK randomly allowed themselves to be bombed with a bias towards less strategic targets. That’s the kind of thing you have to do to hide information, letting yourself be bombed should denote just how serious it is.

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