Thanks for the reactions. Here are a few more informations. It's a Minoru 3D webcam, , you can see it here: http://www.minoru3d.com/ It's basically two VGA webcams glued together,
As far as I have tested, I can access separately each of the 2 webcams + the iSight of my MBP, using iChat, Skype, and OpenCV, ie everything work if I close the connection to the previous webcam. However, I cannot have simultaneous access to the two webcams of the Minoru 3D : if I try this (using OpenCV again, since iChat and Skype do not provide a 3D mode), then the second capture always results in a failure (in my case, my code does not crash but it returns an empty structure). The iSight seems to be still reachable. Since we did manage to have both feeds from the Minoru using Bootcamp + Windows or a Linux laptop, I really doubt that there is a bandwidth issue. By the way, I changed the title of the thread since maybe we're going away from the initial question. Please also let me know if you think another mailing list is more appropriate. Again, thanks for your inputs, Emmanuel So, my guess is that somewhere, a piece of Le 11 mai 2011 à 08:13, Achim Breidenbach a écrit : > Hello Emmanuel, > > The limitations for USB is the amount of Data which can go through the > line. If you have HD video dimensions, the USB bus could proberbly be > load with maximum capacity. Then you can't put a second cam on the > same bus. > > Btw. What 3D cam brand do you use? > > Ahim Breidenbach > Boinx Software > > On 10.05.2011, at 21:19, D'Angelo Emmanuel <[email protected]> wrote: > >> Hi, >> >> I tried to use a stereo USB webcam (that works correctly under other OS's) >> with OpenCV, using Snow Leopard's QTKit. I could list the 2 cameras but >> always produced a crashe when trying to get image data from the second. >> Googling for it, I found some info saying that you can't have 2 cameras on >> the same USB bus. >> >> If this info is correct, then you may be stuck in the same dead end. >> >> Emmanuel >> >>> From: Nathan Sims <[email protected]> >>> Subject: Re: 3D movie >>> To: Christopher Wright <[email protected]> >>> Cc: Quartz List <[email protected]> >>> Message-ID: >>> <[email protected]> >>> Content-Type: text/plain; charset=us-ascii >>> >>> On May 5, 2011, at 9:41 AM, Christopher Wright wrote: >>> >>>>> QuickTime doesn't seem to directly support this, but I'm hoping that QC >>>>> might... I would like to take 2 camera video feeds and combine them to >>>>> produce "3D" output when viewed with red/blue glasses. Would there be a >>>>> way in QC to do this? >>>> >>>> google quartz composer anaglyph >>>> http://paulbourke.net/texture_colour/anaglyph/ is the first hit, and >>>> there are likely to be other good resources as well. >>>> >>>> Your biggest problem might be getting 2 camera feeds working. >>> >>> How right you are! Getting two camera feeds working is my stumbling block. >>> I have the basic composition working, and can use it successfully with two >>> prerecorded input movies. But placing two Video Input patches in the >>> composition, only one camera gets activated, regardless of how I set the >>> input selector of the video patches. For this test, I'm using two external >>> Firewire iSights with a Belkin Firewire hub. Note: I can use one of the >>> external iSights and the internal iSight of my MacBook simultaneously, but >>> the video feeds of these two cameras are too different for stereo viewing >>> to work well. >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Quartzcomposer-dev mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/quartzcomposer-dev/achim%40boinx.com >> >> This email sent to [email protected] _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
