Public bug reported:
I have a strange problem with webcams Creative Live! Cam Sync HD VF0770
(041e:4095).
I have two of them.
I would like to stream simultaneous streams with 1280x720 at 5fps.
When connected directly to laptop, I can do this, actually I can stream the
same resolution at 30fps.
But, when I plug both of them using USB hub (Gembird 7-port USB2.0 powered
hub), I can stream one camera.
But when starting the second one, the dmesg throws error
uvcvideo: Failed to submit URB 0 (-28).
and the mjpg-streamer shows
Unable to start capture: No space left on device
>From other defects reported here I understand that this is a problem with USB
>bandwidth allocation.
However, the USB for both cameras seems to be set at 480Mbit - this is the
output of lsusb -v -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/5p, 480M
|__ Port 4: Dev 19, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 2: Dev 24, If 0, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 2: Dev 24, If 1, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 2: Dev 24, If 2, Class=audio, Driver=, 480M
|__ Port 2: Dev 24, If 3, Class=audio, Driver=, 480M
|__ Port 3: Dev 20, If 0, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 3: Dev 20, If 1, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 3: Dev 20, If 2, Class=audio, Driver=, 480M
|__ Port 3: Dev 20, If 3, Class=audio, Driver=, 480M
|__ Port 4: Dev 21, If 0, Class=hub, Driver=hub/4p, 480M
I tried lowering the resolution for both cams to 320x240, minimum fps for the
camera is 5, so I can't go any lower than that.
Can anyone, please, point me out how can I investigate this problem further?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1227583
Title:
Webcam USB bandwidth problem when connected using USB2.0 hub
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