This is a bundle of scripts to capture and stream from web cameras. It tested, works on Raspberry Pi 2, 3.
Gstreamer uses for video/audio capture and for streaming.
Video encoding forced by Raspberry hardware acceleration - OpenMAX:
https://jan.newmarch.name/LinuxSound/Sampled/OpenMAX/
All Gstreamer's pipelines are in the files:
cam*_streamer.sh
and you can easily change them for you needs.
Main config file is in the file:
shared_conf.sh
By default Gstreamer streams to Nimble server
(yes it works on Raspberry Pi and it free):
https://wmspanel.com/nimble
via rtmp in flv format: h264 video, aac audio.
At the same time script gets streams using wget - http downloading to
local file system (usually to a sdcard).
Because of limit space on sdcard, script uses file syncing with a remote file system. It uses rsync over ssh (key authentication).
Sync script runs using cron, for instance:
*/30 * * * * cam_capturer.sh
Every 30 minutes it syncs files to a remote file system and runs ffmpeg
for captured files recovering. When a new day has come, script syncing,
recovering data and then remove files from a local file system for a
previous day.
Nimble server allows to restream captured data via rtsp.
In this case it easy to add all capturing streams to Ivideon service
(Ivideon server needed in this case):
https://ivideon.com
and get low-cost cloud video surveillance.
This is top command output on Raspberry Pi 2:
top - 11:13:33 up 9:39, 3 users, load average: 1.97, 1.98, 2.00
Tasks: 166 total, 1 running, 165 sleeping, 0 stopped, 0 zombie
%Cpu(s): 15.0 us, 3.2 sy, 0.0 ni, 79.2 id, 0.0 wa, 0.0 hi, 2.6 si, 0.0 st
KiB Mem: 752876 total, 738752 used, 14124 free, 63904 buffers
KiB Swap: 1023996 total, 24 used, 1023972 free. 521824 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1463 pi 20 0 169104 19416 8204 S 52.0 2.6 303:38.20 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-Sonix_Technology_+
1450 pi 20 0 163220 13312 5904 S 13.9 1.8 100:37.34 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-046d_09a4_C9469E2+
1498 pi 20 0 128252 12052 5452 S 7.4 1.6 43:02.80 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-Etron_Technology_+
906 root 20 0 321476 41548 4572 S 6.5 5.5 35:46.40 /usr/bin/nimble -d --conf-dir=/etc/nimble --log-dir=/var/log/nimbl+
12213 root 20 0 5252 2380 1952 R 4.6 0.3 0:00.55 top -d 1
...
In the above example there are 3 USB cameras with the following parameters:
1463 pid: 1280x720 h264 video + aac audio
1450 pid: 640x480 h264 video + aac audio
1498 pid: 640x480 h264 video, no audio
Mostly the same for Raspberry Pi 3
$ grep Revision /proc/cpuinfo
Revision : a22082
Tasks: 177 total, 1 running, 176 sleeping, 0 stopped, 0 zombie
%Cpu(s): 12.3 us, 0.8 sy, 0.0 ni, 84.5 id, 0.0 wa, 0.0 hi, 2.4 si, 0.0 st
KiB Mem: 752872 total, 490548 used, 262324 free, 26772 buffers
KiB Swap: 1023996 total, 0 used, 1023996 free. 323548 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1660 pi 20 0 167892 27348 17668 S 40.3 3.6 22:57.02 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-Sonix_Technology_+
1695 pi 20 0 126748 19724 14240 S 7.7 2.6 3:51.37 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-Etron_Technology_+
1647 pi 20 0 163260 22284 15036 S 4.8 3.0 6:10.85 gst-launch-1.0 v4l2src device=/dev/v4l/by-id/usb-046d_09a4_C9469E2+
1150 root 20 0 314780 39016 7500 S 3.8 5.2 2:07.54 /usr/bin/nimble -d --conf-dir=/etc/nimble --log-dir=/var/log/nimbl+
Author: Alexey Tsarev.
Email: Tsarev.Alexey at the gmail.com.