If you are getting vidoc_streamon error 28, this tutorial will help you.
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When I try to open two video streams with it, I actually get an error that there is no more free space on the device.
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I know this is due to the main bandwidth limitations of the two cameras on a particular USB hub. I tried to minimize the resolution for each camera, but it didn’t help.
Has anyone used stereo vision and was there enough two cameras to stream ROS simultaneously at regular intervals?
sudo rmmod uvcvideosudo modprobe uvcvideo quirks = 128
Then I can simultaneously take pictures from 2 surveillance cameras.Credits: http://renoirsrants.blogspot.com/2011/07/multiple-webcams-on-zoneminder.htmlFollow this link to learn how to add it O to your module configuration to make improvements permanent.
However, using OpenCV to get images from a webcam may not work. But in general, everything is fine with usb_cam pkg.
Sorry, your camera version may not work for this. Cool USB gadgets have to specify interface descriptors, and camera manufacturers often choose a terrible set in terms of descriptor settings that don’t reflect the data transfer saved by reducing the image size. When clients run “lsusb -v”, they can search for the camera and often find various things, for example:
Interface descriptor
: b length 9 b Descriptor type 4 b Interface number 1 b Alternative setting 4 bNumEndpoints 1 bClass 11 video interface streaming video bInterfaceSubClass 2 b Interface protocol 8 I interface 0 Endpoint descriptor: b length 7 bDescriptorType 5 b Endpoint address 0x82 EP 2 IN bmA Attribute 5 Isochronous transfer type Asynchronous sync type Usage data wMaxPacketSize 0x1400 3x 1024 bytes b interval 1
If there is no reliable deska reasonably sized riptor (a descriptor large enough to handle your video stream, but small enough so that two of them don’t overload the bus), the call to d open will fail. You can do one thing:
- Connect each camera to a separate USB bus (this can be as simple as moving the ports they are connected to, but it can also be impossible compared to your current computer).
- Buy another camera arrangement that has a better choice – image size.
- Hack USB (very advanced vehicle driver and not recommended). The reality is that the calculation of the USB bus bandwidth is undoubtedly based on an overestimation of the device type and already leaves excessive bandwidth opening the endpoint even if the check fails. Before I started using your current Kinect, I did a little research (there should be a USB video driver forum where you can find a ton of information), but decided that cameras should be replaced with our own approach, which is simpler.
When I connect two cameras, they both disappear at 002.
I manually integrated into / dev / bus / usb / and moved the second camera from USB bus 002 to USB bus 001, but it still didn’t work. the same error.
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