On 11/26/20 2:34 PM, Thomas Steen Rasmussen wrote:
On 11/26/20 1:18 PM, Hans Petter Selasky wrote:
Hi Thomas,
Try setting the resolution or framerate down, because high resolution
webcams need a lot of USB bandwidth!
Hi,
Hi,
Thanks for the reply. How can I set the resolution or framerate lower?
I first connect both webcams, and then try for example with the pwcview
command:
$ sudo pwcview -h -c 1 -o foo.jpg -d /dev/video0 -s xga
Webcam set to: 640x480 (xga) at 5 fps
$
$ sudo pwcview -h -c 1 -o foo.jpg -d /dev/video2 -s xga
Webcam set to: 640x480 (xga) at 5 fps
^C
$
Try "vga" instead of "xga".
And only the first (video0+1) works, the second (video2+3) never
returns. Can I maybe tell webcamd to set fps and resolution somehow or
how would I do it?
This is done by the clients of V4L.
You could try to run webcamd in the foreground. It is also possible to
enable debugging when you build webcamd from ports. Also, usbdump, can
dump the traffic of these devices so that you see exactly what is going on.
Can you show what usbconfig tell about these two devices when they are
connected?
In the "sysctl -a" output you'll find some "%parent" nodes which tell
how they are connected. Also "devinfo" will tell that.
The webcams are connected to a externally powered USB3 hub which is
connected to a USB3 XHCI controller. I would think the 5 gbit/s offered
by USB3 would be enough for this.
USB3 is an own bus, and the 5 GBit/s won't be used unless your device is
3.0 compatible.
Actually your USB HUB has USB2 and USB3 in parallell.
The onboard usb3 controller:
usbus0 on xhci0
usbus0: 5.0Gbps Super Speed USB v3.0
ugen0.1: <0x1022 XHCI root HUB> at usbus0
uhub1: <0x1022 XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on usbus0
When I plugin the external USB hub it shows both a usb 2 and a usb3 hub
for some reason?
ugen0.2: <VIA Labs, Inc. USB2.0 Hub> at usbus0, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE (0mA)
ugen0.3: <VIA Labs, Inc. USB3.0 Hub> at usbus0, cfg=0 md=HOST spd=SUPER
(5.0Gbps) pwr=SAVE (0mA)
This is normal and expected! Is the USB HUB self powered?
uhub5 on uhub1
uhub5: <VIA Labs, Inc. USB2.0 Hub, class 9/0, rev 2.10/2.21, addr 1> on
usbus0
uhub5: 4 ports with 4 removable, self powered
uhub6 on uhub1
uhub6: <VIA Labs, Inc. USB3.0 Hub, class 9/0, rev 3.00/2.21, addr 2> on
usbus0
uhub6: 4 ports with 4 removable, self powered
So when I plug in the webcams how do I know which "uhub" device they are
plugged into? These are the messages after plugging in the webcams:
=====================================
ugen0.4: <Jieli Technology USB PHY 2.0> at usbus0
uaudio0 on uhub5
uaudio0: <USB Microphone> on usbus0
uaudio0: No playback.
uaudio0: Record[0]: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Record[0]: 44100 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Record[0]: 16000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Record[0]: 8000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: No MIDI sequencer.
pcm0: <USB audio> on uaudio0
uaudio0: No HID volume keys found.
ugen0.5: <Jieli Technology USB PHY 2.0> at usbus0
uaudio1 on uhub5
uaudio1: <USB Microphone> on usbus0
uaudio1: No playback.
uaudio1: Record[0]: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio1: Record[0]: 44100 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio1: Record[0]: 16000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio1: Record[0]: 8000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio1: No MIDI sequencer.
pcm1: <USB audio> on uaudio1
uaudio1: No HID volume keys found.
=====================================
"uhub5" is the usb2 external hub. Could this be the reason for my timeouts?
Maybe. You can check:
usbdump -i usbus0 -s 65536
And see if there are any USB errors besides from cancelled.
Are you running -stable ?
--HPS
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