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Gunter

Gunter

Draganflyer X4
Droider said:
What settings did you use Gunter? have you slowed that down?

Dave
Click to expand...

Dave, it was taken at 720 60p and slowed down. I rendered it as an mp4 but I'll check later what all the individual settings were. Final file size was just over 100mb.


Regards,

Gunter.
Sent from my iPhone using Tapatalk
 

Macsgrafs

Macsgrafs

Active Member
I noticed that a few guys refer to the word "Jelo"...now can someone post up exactly what it is & what causes it? Just in case any of you are wondering....I'm pretendign to be a newb & would like to see peoples views on this.

Ross
 



Gunter

Gunter

Draganflyer X4
Macsgrafs said:
caused by?
Click to expand...

Not being firmly mounted to the frame/gimbal. So if there is a slight bit of movement it vibrates very quickly. Imaging for example an orbital sander. In my case it was mounted to the gopro handlebar mount which is a couple or 3 inches long and it has movement. Because it was directly under a motor on the boom, this caused loads of vibration which comes out as jello.


Regards,

Gunter.
Sent from my iPhone using Tapatalk
 




DucktileMedia

DucktileMedia

Drone Enthusiast
Take rolling shutter.....now visualize every time the craft oscillates it is reversing the direction of the rolling shutter. The jello is the frequency of the rolling shutter effect. You get rid of it by eliminating as much vibration as possible AND getting the harmonic frequencies of the camera and heli to NOT line up. Everything in life has a resonating frequency. When the oscillation of the heli hits a certain range it shows up as really bad jello. Bart gave me a really good test to try and it seemed to work. Do a flight with lots of varying throttle. When you watch the video results you can see/hear what throttle the vibrations start to subside. Normally the faster you spin the prop the less you see these low frequency oscillations. So perhaps the answer is flying a smaller prop and a cell higher voltage?
 



DucktileMedia

DucktileMedia

Drone Enthusiast
juz said:
wow. Quality stuff from around the world. Love it. :tennis:

somethin' from downunder.

Click to expand...

Yeah, Juz....you take the cake for fun factor. We're all trying to add Enya track's to flying around a sculpture or something and you are out flying that thing like a real heli! Nice work. I/we would love to know what your setup is. Looks like gopro on a quad using a single 900 Mhz Tx? Any secrets on the super stable gopro footage? I am having some luck with smaller props but there is a hint of jello in certain situations.
 
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Macsgrafs

Macsgrafs

Active Member
IrisAerial said:
Take rolling shutter.....now visualize every time the craft oscillates it is reversing the direction of the rolling shutter. The jello is the frequency of the rolling shutter effect. You get rid of it by eliminating as much vibration as possible AND getting the harmonic frequencies of the camera and heli to NOT line up. Everything in life has a resonating frequency. When the oscillation of the heli hits a certain range it shows up as really bad jello. Bart gave me a really good test to try and it seemed to work. Do a flight with lots of varying throttle. When you watch the video results you can see/hear what throttle the vibrations start to subside. Normally the faster you spin the prop the less you see these low frequency oscillations. So perhaps the answer is flying a smaller prop and a cell higher voltage?
Click to expand...

Firstly, I love your video...so smooth! Good subject to start off with as well...Excellent result.
Thanks for your explanation of jelo. I always thought it was called rolling shutter & only HD cams suffered with it, glad I asked now ;)
I would love to post a video I took 2 days ago, however my computer crashes every time I try to edit it...gutted!

Ross
 


Gunter

Gunter

Draganflyer X4
I knocked up a quick video in the forest on Sunday purely to see what the J1 would do in low light. The quality is down a bit because I filmed at 30fps and then still slowed it down loads...but it kind of works!

 
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DucktileMedia

DucktileMedia

Drone Enthusiast
Macsgrafs said:
Firstly, I love your video...so smooth! Good subject to start off with as well...Excellent result.
Thanks for your explanation of jelo. I always thought it was called rolling shutter & only HD cams suffered with it, glad I asked now ;)
I would love to post a video I took 2 days ago, however my computer crashes every time I try to edit it...gutted!

Ross
Click to expand...

thanks.

to add to the rolling shutter explanation, it is something only CMOS sensors develop. CCD sensors never had this issue as they read the whole frame at once. the Cmos sensor scans from top to bottom every frame very quickly. You normally dont notice this but when things start moving(panning) quicker than the rate it takes the scan line to go from top to bottom of the frame you get.....rolling shutter.

 
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Macsgrafs

Macsgrafs

Active Member
Hey Gunter, thats pretty smooth mate, nicely done.

Iris, thanks for the explanation...so a 3CCD camera shouldnt suffer with rolling shutter. What gets me is that my gopro doesnt show half the vibrations that my panasonic does ;)

Ross
 

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