USB webcam issue

[sepulep]

I have got an issue with a usb digital miscroscope: when connecting it registers, and pandora generates a /dev/video0
however, when trying to use this (with e.g. mplayer), its reported as busy and program will abort. after this the /dev/video0
is gone (and the lsusb no longer reports the device).

for me it looks like a driver issue, is there a way to debug or tweak this?

 

[elw3]

Why mplayer?
Try a webcam tool like _cheese_first.

 

[notaz]

Also check the dmesg output.

 

[sepulep]

the dmesg is:

Spoiler

[ 567.895904] usb 1-2: new high-speed USB device number 2 using ehci-omap
[ 568.076690] usb 1-2: New USB device found, idVendor=05e3, idProduct=0510
[ 568.076812] usb 1-2: New USB device strings: Mfr=2, Product=3, SerialNumber=0
[ 568.076995] usb 1-2: Product: USB2.0 UVC PC Camera
[ 568.077178] usb 1-2: Manufacturer: GenesysLogic Technology Co., Ltd.
[ 568.711334] media: Linux media interface: v0.10
[ 568.742614] Linux video capture interface: v2.00
[ 568.742828] WARNING: You are using an experimental version of the media stack.
[ 568.742828] As the driver is backported to an older kernel, it doesn't offer
[ 568.742828] enough quality for its usage in production.
[ 568.742828] Use it with care.
[ 568.742858] Latest git patches (needed if you report a bug to linux-media@vger.kernel.org):
[ 568.742858] b250392f7b5062cf026b1423e27265e278fd6b30 [media] media: ttpci: fix av7110 build to be compatible with CONFIG_INPUT_EVDEV
[ 568.742858] 85c1abcb5251673d18325576f4923bb78af479de [media] usbtv: Make it dependent on ALSA
[ 568.742858] 66cae53024c4b73d40b4e78c557a73e082522aed [media] media: fix au0828 dvb suspend/resume to call dvb_frontend_suspend/resume
[ 568.777130] uvcvideo: Found UVC 1.00 device USB2.0 UVC PC Camera (05e3:0510)
[ 568.823547] input: USB2.0 UVC PC Camera as /devices/platform/usbhs-omap.0/ehci-omap.0/usb1/1-2/1-2:1.0/input/input8
[ 568.825683] usbcore: registered new interface driver uvcvideo
[ 568.825897] USB Video Class driver (1.1.1)

mplayer:

Spoiler

Player SVN-r30165-4.3.3 (C) 2000-2009 MPlayer Team

Playing tv://.
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input
author: Martin Olschewski <olschewski@zpr.uni-koeln.de>
comment: first try, more to come ;-)
v4l2: unable to open '/dev/video0': Device or resource busy
v4l2: ioctl set mute failed: Bad file descriptor
v4l2: 0 frames successfully processed, 0 frames dropped.


Exiting... (End of file)

is cheese available for pandora?? (dont expect it to behave differently...))

 

[ingoreis]

That looks good..its registered as Device in the right way:
Here is one working

Install Mplayer on the Nand with this Howto:
and then start this Software:
https://repo.openpandora.org/?page=detail&app=camera-001

Edit:
sometimes i realy miss a newer Kernel with more Videodrivers on the Pandora like Dvb-t2 Devices

 

[levi]

the dmesg is:

Is there nothing in the dmesg from the time when the /dev device goes missing? The dmesg you've posted does say it's something of an experimental backport though, so perhaps it's not too much of a surprise it can crash.

 

[sepulep]

dmesg reports the disconnect of the usb device, w/o any error:
[ 698.880767] usb 1-2: USB disconnect, device number 2

 

[levi]

Hmm, maybe it's not a crash then, just the device itself not liking what the driver's saying to it and dropping the mic.

Unfortunately, there's not a lot we can do with this information. There might be an updated codebase that could be ported, but at this stage in the life of the pandora, I'd prioritise a kernel that's still supported over any specific driver update myself. I've not checked, but IIRC the LTS we're on ran out in the Autumn at some point.

 

[ptitSeb]

Maybe it's a power issue, and a powered USB2 Hub is needed?

 

[elw3]

the dmesg is:
is cheese available for pandora?? (dont expect it to behave differently...))

Apparently i meant _camcoder_ for the pandora, using cheese on the desktop tho.
Some cams need to be configurated, i dont expect you tell mplayer to do it.

Maybe it's a power issue, and a powered USB2 Hub is needed?

Are we talking about the same pandora that powers a hub of HDDs without giving a fuck?

 

[sepulep]

interstingly, if I connect to my laptop (which is running opensuse tumbleweed), i get:

[ 3458.059387] usb 1-1: new high-speed USB device number 3 using xhci_hcd
[ 3458.234901] usb 1-1: New USB device found, idVendor=05e3, idProduct=0510, bcdDevice=12.09
[ 3458.234910] usb 1-1: New USB device strings: Mfr=2, Product=3, SerialNumber=0
[ 3458.234915] usb 1-1: Product: USB2.0 UVC PC Camera
[ 3458.234920] usb 1-1: Manufacturer: GenesysLogic Technology Co., Ltd.
[ 3458.346615] videodev: Linux video capture interface: v2.00
[ 3458.362683] uvcvideo: Found UVC 1.00 device USB2.0 UVC PC Camera (05e3:0510)
[ 3458.363670] uvcvideo: Failed to query (GET_INFO) UVC control 4 on unit 1: -32 (exp. 1).
[ 3458.416377] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
[ 3458.417359] input: USB2.0 UVC PC Camera: USB2.0 UV as /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/input/input28
[ 3458.417555] usbcore: registered new interface driver uvcvideo
[ 3458.417556] USB Video Class driver (1.1.1)

and it does work. Maybe its the bit about the non-compliance and the workaround that is not implemented on the pandora kernel/modules...??
(hmm...I tried out on an older machine, and there it works w/o reporting the bit about the workaround...1.1.0 video class driver though)

 

[ptitSeb]

Are we talking about the same pandora that powers a hub of HDDs without giving a fuck?

It's not the same on my side, an HDD doesn't get enough juice from my Pandora to operate correctly and I need a powered Hub to use it.