I think you missed my point. You *could* use ethernet as well as USB . . . On Sun, Feb 22, 2015 at 11:14 PM, Yiling Cao <[email protected]> wrote:
> proper IP camera/ mobile phone camera dont use USB, they use MIPI or CSI2 > to interface with MPU. > > USB webcam is just for some hobby/demo use. > > On Mon, Feb 23, 2015 at 1:23 PM, William Hermans <[email protected]> > wrote: > >> 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. >> > > -- > 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. 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