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| | | Forum Member
 
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Last Login: 11/24/2008 5:24:17 PM
Posts: 29, Visits: 39 |
| Did you get anywhere with this project? I'm exploring the possibility of using the VR920 for my RC RPV plane (Multiplex Easy Star).
Combined with the PCTx, I can generate additional channels that I do not have available on my 6-chan Spektrum DX6i remote, and receive these channels on the other end through a 9-channel AR9000 RX. I am using the Vuzix head tracking SDK to interface with the extra channels to handle pan & tilt for FPV camera (which transmits video on 900Mhz).
The major problem I have encountered is the 1-2 second delay of video (not good for flying an airplane, you could be crashed before you saw it) - I'm using an EasyCap USB 2.0 video capture device to import the composite video from the video receiver into the computer for display through a laptop LCD screen and the VR920.
Just processing the video from the capture device seems the problem. I have tried WM Player, VLC, and Ulead, all show this delay problem.
It would be nice if I could just connect composite video directly into the VR920, and use the USB for power and head-tracking. Anyone have any ideas about if this can be accomplished?
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| | | Supreme Being
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Last Login: 12/26/2008 6:18:15 AM
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| | the delay might be from the usb connection , but cant be sure. |
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Supreme Being
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Last Login: Today @ 2:05:18 PM
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| Delay in video is not from USB for sure. All video-signal for VR920 goes thru VGA.
I connected my VR920 to a laptop with hi-def webcam, for video-translation I used a standard logitech software and don't see any noticeable time-lag.
Also there was no lag, when I used ARToolKit for Augmented Reality applications.
I think problem is in radio-translation of video signal, and especially in signal-decoding stage.
Maybe your PC isn't fast enough to handle such operations?
Or, maybe problem is in a low-framerate webcam?
Does you notice the same time-lag when you use wired connection to webcam?
Sorry, I cannot propose you other video-software, because I don't worked with wireless video signal translation. |
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| | | Forum Member
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Last Login: 11/24/2008 5:24:17 PM
Posts: 29, Visits: 39 |
| I think the delay is caused by the VLC player. I found a setting for "cache" that was set to 200ms. I set this value to 0ms, and the responsiveness is greatly improved. There is a slight delay, but I think that may still be something with the VLC player software.
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| | | Forum Newbie
Group: Forum Members
Last Login: 12/11/2008 5:14:13 AM
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| Alpinex: I believe the issue is directly related to the processing delays in the PC itself.
Considering that your intention is to view the 2D image via the Vr920, yet leverage the VR controls of the VR920 I believe the solution is as follows:
Assuming that your 900MHz receiver gives you AV output (please correct me if I am wrong) then get an AV to VGA converter (and an AV splitter if you want the video also send to your AV input in your PC) and push the signal directly into the VR920.
Unfortunately Vuzix did not give us both input options, and therefore for your application the AV920 would have better suited the video, but then you would have lost the VR inputs which is the exciting part of your project.
P.S. I am very interested in starting a similar project. Please could you let me have details of your research as far as cameras and wireless video transmitter are concerned such that I may learn from your experience, as my friends have never done similar here in Cape Town, South Africa (other than very expensive commercial applications).
Later I will look at adding 2nd camera (for stereoscopic vision) with Pan and Tilt, add GPS and some kind of onboard programmable controller with motion specific transducers for offline/distant controlling (I had research a product like this sometime ago but do not recall the name right now).
Regards,
Jason |
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