Date: Thu, 26 Nov 2020 14:34:18 +0100 From: Thomas Steen Rasmussen <thomas@gibfest.dk> To: Hans Petter Selasky <hps@selasky.org> Cc: usb@freebsd.org Subject: Re: webcamd, usb and two webcams - only one works Message-ID: <723be24d-b2fe-85df-4961-5483004050e8@gibfest.dk> In-Reply-To: <9a382539-c90d-91b9-bfac-f36c0f19d3f7@selasky.org> References: <c11c1a2f-306f-3cd9-825f-4c39fd250d50@gibfest.dk> <9a382539-c90d-91b9-bfac-f36c0f19d3f7@selasky.org>
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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, 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 $ 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? 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. 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) 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? Thanks! /Thomas
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