id imagije if you used IP cameras, You could do a couple more. The BBB's Ethernet port is as fast as fast Ethernet gets to theoretical.
On Sun, Feb 22, 2015 at 6:00 PM, Alvaro Garcia <[email protected]> wrote: > The max framerate you will get is 15 fps, no matter about USB speed. It is > because of DMA problem or something. I tried several cameras and could get > more than 15 fps (trying yuv, mjpeg, x264...) > > 2015-02-23 1:19 GMT+01:00 Alex de Geofroy <[email protected]>: > >> Thanks Robert, >> >> As a side note, thank you for all the help you provide people here and >> elsewhere. I haven't been very active in this group, but I've been >> subscribing and reading for a while. I guess the phrase "Long time >> listener, first time caller" would be appropriate. >> >> Anyway, USB 2.0 will transfer at 480 Mbps (in the best case) which is >> twice the bandwidth I'd need to run four 1080p30 cameras streaming MJPEG at >> approximately 60 Mbps, or roughly four times the bandwidth I'd need for >> 720p30. >> >> So let's assume that we won't have a bottleneck on the USB, and I'll save >> the videos to a NAS over Ethernet (USB & Ethernet are not shared, right?) >> so we won't have a bandwidth issue there either. If this is true, would the >> BBB have the horsepower to run motion detection on all four streams and >> output to a NAS reliably? If not four cameras, how about 3, or 2? >> >> I understand that this is a pretty specific case and I might just have to >> try it out to see what it can handle, I'm just trying to get a feel for >> whether or not it's even worth trying with a BBB, or if I should look for a >> higher-end board and cough up the extra cash. >> >> Thanks again! >> >> On Sun, Feb 22, 2015 at 6:56 PM, Robert Nelson <[email protected]> >> wrote: >> >>> On Sun, Feb 22, 2015 at 5:48 PM, Alex DG <[email protected]> wrote: >>> > I've been playing around with my BBB for a couple months now and I >>> love it. >>> > I've currently got it set up streaming video to my website 24/7. >>> > >>> > I'm now wondering how many USB cameras I could reasonably expect to >>> use on >>> > this thing at one time, because I want to set up a sort of improved IP >>> > camera system. Essentially I want to create a networked array of HD >>> cameras, >>> > so I'm trying to decide which SBC would be able to reliably record >>> 720p or >>> > 1080p video from as many cameras as possible. The cameras need to run >>> 24/7, >>> > detect motion, perform some CV tasks (using opencv, presumably), and >>> save >>> > the resulting clips to a NAS, or even just to a USB hard drive. >>> > >>> > So let's say I want to set up an array of 720p30 cameras and record and >>> > process video from them. Using a USB hub, would the BBB handle 2, 3, >>> or even >>> > 4 cameras? What if the frame rate was 60 fps? Or what about 2, 3, or 4 >>> > 1080p30 cameras? >>> > >>> > I'm just trying to get a feel for how capable the BBB is, or if I >>> should >>> > look toward a different, more powerful SBC. >>> > >>> > Thanks in advance for any advice you can offer! >>> >>> Remember, usb is a shared resource. With only one port on the BBB, >>> depending on how much bandwidth the first camera takes will let you >>> know how many you can have plugged in. >>> >>> Regards, >>> >>> -- >>> Robert Nelson >>> http://www.rcn-ee.com/ >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "BeagleBoard" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/beagleboard/a3-AuBq9eyo/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
