USB Webcam Slow, Low Framerate, Delay

andrewyu · September 12, 2020, 7:47pm

I am using Microsoft LifeCam Studio on Jetson Nano (JetPack 4.4), but, found the response is very slow.

I only have around 2 FPS and the capture video have around 3 seconds of delay.

Any solution ?

Honey_Patouceul · September 12, 2020, 7:50pm

You may tell how you are accessing your camera for better advice.
From gstreamer with v4l2src ? If yes, you may try option io-mode=2.

andrewyu · September 12, 2020, 7:56pm

I got this result, even I just run video-viewer v4l2:///dev/video0

Honey_Patouceul · September 12, 2020, 8:05pm

What gives (assuming this cam is /dev/video0):

sudo apt install v4l-utils
v4l2-ctl -d0 --list-formats-ext

andrewyu · September 12, 2020, 8:09pm

It listed 3 formats, YUYV, MJPG, M420 pixel format

Honey_Patouceul · September 12, 2020, 8:14pm

Be sure your USB BW is ok:

lsusb -t

It may be an issue with MJPG format, you may try YUY2 format (raw) :

video-viewer v4l2:///dev/video0 --input-codec=raw

If not working, please share the full output.

andrewyu · September 12, 2020, 8:21pm

It work fine now
Many thanks !!

foreverneilyoung · January 10, 2021, 4:13pm

Hi, sorry for highjacking. I’m having the same issue with 3 brand new USB-2 cams on a Jetson nano. All cams give 30 fps on other devices (whereas I have to admit, this is not a constant achievement. Sometimes also these ominous 11 fps have been seen…)

Admittedly these are inexpensive cams (about 24 € each).

I have already made all tests suggested so far, but I cannot achieve 30fps.

neil@jetson:~$ lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/4p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/5p, 480M
    |__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
        |__ Port 1: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
        |__ Port 2: Dev 4, If 2, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 2: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
        |__ Port 2: Dev 4, If 3, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 2: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
        |__ Port 3: Dev 5, If 3, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 3: Dev 5, If 1, Class=Video, Driver=uvcvideo, 480M
        |__ Port 3: Dev 5, If 2, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 3: Dev 5, If 0, Class=Video, Driver=uvcvideo, 480M
        |__ Port 4: Dev 6, If 3, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 4: Dev 6, If 1, Class=Video, Driver=uvcvideo, 480M
        |__ Port 4: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M
        |__ Port 4: Dev 6, If 0, Class=Video, Driver=uvcvideo, 480M


neil@jetson:~$ v4l2-ctl -d0 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
	Index       : 0
	Type        : Video Capture
	Pixel Format: 'MJPG' (compressed)
	Name        : Motion-JPEG
		Size: Discrete 1920x1080
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 1280x720
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 640x480
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 352x288
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 320x240
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 176x144
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 160x120
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 1920x1080
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)

	Index       : 1
	Type        : Video Capture
	Pixel Format: 'YUYV'
	Name        : YUYV 4:2:2
		Size: Discrete 640x480
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 352x288
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 320x240
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 176x144
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 160x120
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)
		Size: Discrete 640x480
			Interval: Discrete 0.033s (30.000 fps)
			Interval: Discrete 0.040s (25.000 fps)
			Interval: Discrete 0.050s (20.000 fps)
			Interval: Discrete 0.067s (15.000 fps)
			Interval: Discrete 0.100s (10.000 fps)
			Interval: Discrete 0.200s (5.000 fps)

neil@jetson:~$

video-viewer v4l2:///dev/video0 --input-codec=raw with or without --input-codec shows not more than 11 fps…

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USB Webcam Slow, Low Framerate, Delay

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