lsusb | grep cam
Bus 001 Device 005: ID 046d:0825 Logitech, Inc. Webcam C270

lsusb
Bus 001 Device 004: ID 046d:082c Logitech, Inc. HD Webcam C615
dmesg | grep uvcvideo | head -1
[    4.538065] uvcvideo: Found UVC 1.00 device HD Webcam C615 (046d:082c)

v4l2-ctl -V
Format Video Capture:
	Width/Height      : 352/288
	Pixel Format      : 'MJPG' (Motion-JPEG)
	Field             : None
	Bytes per Line    : 0
	Size Image        : 102400
	Colorspace        : sRGB
	Transfer Function : Default (maps to sRGB)
	YCbCr/HSV Encoding: Default (maps to ITU-R 601)
	Quantization      : Default (maps to Full Range)
	Flags             :

sudo apt-get install qv4l2
qv4l2

sudo apt-get install fswebcam
fswebcam test.jpg
--- Opening /dev/video0...
Trying source module v4l2...
/dev/video0 opened.
No input was specified, using the first.
Adjusting resolution from 384x288 to 352x288.
--- Capturing frame...
Captured frame in 0.00 seconds.
--- Processing captured image...
Writing JPEG image to 'test.jpg'.

#!/bin/bash
server=pichess
pic=chess$$.jpg
resolution=640x480
# https://raspberrypi.stackexchange.com/a/29284/11220 - skip some frames to adjust exposure
ssh $server fswebcam -r $resolution -S 10 -d /dev/video0 /tmp/$pic
scp $server:/tmp/$pic /tmp/$pic
open /tmp/$pic

sudo apt-get install motion
cd /etc/motion
git init
git add *
git commit -a -m "initial checkin"
# edit motion.conf with your favorite editor
git diff motion.conf 
diff --git a/motion.conf b/motion.conf
index 23c8810..b96df83 100644
--- a/motion.conf
+++ b/motion.conf
@@ -8,7 +8,7 @@
 ############################################################
 
 # Start in daemon (background) mode and release terminal (default: off)
-daemon off
+daemon on
 
 # File to store the process ID, also called pid file. (default: not defined)
 process_id_file /var/run/motion/motion.pid
@@ -76,14 +76,14 @@ rotate 0
 flip_axis none
 
 # Image width (pixels). Valid range: Camera dependent, default: 320
-width 320
+width 352
 
 # Image height (pixels). Valid range: Camera dependent, default: 240
-height 240
+height 288
 
 # Maximum number of frames to be captured per second.
 # Valid range: 2-100. Default: 100 (almost no limit).
-framerate 2
+framerate 30
 
 # Minimum time in seconds between capturing picture frames from the camera.
 # Default: 0 = disabled - the capture rate is given by the camera framerate.
@@ -458,7 +458,7 @@ stream_motion off
 stream_maxrate 1
 
 # Restrict stream connections to localhost only (default: on)
-stream_localhost on
+stream_localhost off
 
 # Limits the number of images per connection (default: 0 = unlimited)
 # Number can be defined by multiplying actual stream rate by desired number of seconds
# fix /etc/default/motion
cat /etc/default/motion 
# set to 'yes' to enable the motion daemon
start_motion_daemon=yes

cd /usr/local/lib
sudo -s
git clone https://github.com/jacksonliam/mjpg-streamer
apt-get install -y cmake libjpeg8-dev
cd mjpg-streamer/mjpg-streamer-experimental
make
make install

./mjpg_streamer -i input_uvc.so -o 'output_http.so -w www'

cat /usr/local/lib/mjpg-streamer/mjpg-streamer-experimental/run
#!/bin/bash
# Start Webcam streaming
# WF 2020-01-24
scriptdir=$(dirname $0)
echo $scriptdir
cd $scriptdir
./mjpg_streamer -i input_uvc.so -o 'output_http.so -w www'

chmod +x /usr/local/lib/mjpg-streamer/mjpg-streamer-experimental/run

root@pi4car:/etc/systemd/system# cat webcam.service 
[Unit]
Description=Webcam Streaming

[Service]
Type=simple
ExecStart=/usr/local/lib/mjpg-streamer/mjpg-streamer-experimental/run
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=webcam
Restart=on-abnormal
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

sudo systemctl enable webcam.service
service webcam start
service webcam status
● webcam.service - Webcam Streaming
   Loaded: loaded (/etc/systemd/system/webcam.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-01-24 07:42:33 CET; 4s ago
 Main PID: 2396 (run)
    Tasks: 4 (limit: 4915)
   Memory: 780.0K
   CGroup: /system.slice/webcam.service
           ├─2396 /bin/bash /usr/local/lib/mjpg-streamer/mjpg-streamer-experimental/run
           └─2398 ./mjpg_streamer -i input_uvc.so -o output_http.so -w www

Jan 24 07:42:34 pi4car webcam[2396]:  o: HTTP Listen Address..: (null)
Jan 24 07:42:34 pi4car webcam[2396]:  o: username:password....: disabled
Jan 24 07:42:34 pi4car webcam[2396]:  o: commands.............: enabled
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: www-folder-path......: www/
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: HTTP TCP port........: 8080
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: HTTP Listen Address..: (null)
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: username:password....: disabled
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: commands.............: enabled
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: starting input plugin input_uvc.so
Jan 24 07:42:34 pi4car mjpg_streamer[2398]: MJPG-streamer [2398]: starting output plugin: output_http.so (ID: 00)

curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add -
echo "deb http://www.linux-projects.org/listing/uv4l_repo/raspbian/stretch stretch main" >>  /etc/apt/sources.list
sudo apt-get update
sudo apt-get install uv4l
# do we need to update the firmware?
# sudo rpi-update
sudo apt-get install uv4l-server uv4l-uvc uv4l-xscreen uv4l-mjpegstream uv4l-dummy uv4l-raspidisp
sudo apt-get install uv4l-webrtc 
# for raspi-cam (we are using webcam!)
# apt-get install uv4l-raspicam-extras

/etc/uv4l # git init
Initialized empty Git repository in /etc/uv4l/.git/
/etc/uv4l# git add *
/etc/uv4l# git commit -a -m "initial state"
[master (root-commit) 0e2dc87] initial state
 2 files changed, 555 insertions(+)
 create mode 100644 uv4l-raspicam.conf
 create mode 100644 uv4l-uvc.conf
git diff uv4l-uvc.conf 
diff --git a/uv4l-uvc.conf b/uv4l-uvc.conf
index c01824e..f00b6b6 100644
--- a/uv4l-uvc.conf
+++ b/uv4l-uvc.conf
@@ -54,8 +54,7 @@ frame-buffers = 4
 
 # device-id = <vid>:<pid>
 # alternative to 'device-path', vendor and product identifiers of the USB device
-
-
+device-id = 046d:0825
 #################################
 # streaming server options
 #################################

root@picarford:/etc/systemd/system# cat uv4l.service 
[Unit]
Description=UV4L Webcam 

[Service]
Type=simple
ExecStart=/usr/bin/uv4l -k --sched-rr --mem-lock --config-file=/etc/uv4l/uv4l-uvc.conf --driver uvc --driver-config-file=/etc/uv4l/uv4l-uvc.conf --server-option=--editable-config-file=/etc/uv4l/uv4l-uvc.conf --device=046d:0825
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=uv4l
Restart=on-abnormal
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

sudo systemctl enable uv4l.service
sudo systemctl start uv4l.service