documentation:webcam
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documentation:webcam [2015/12/05 10:56] – created nine | documentation:webcam [2015/12/26 18:40] (current) – [Camera] nine | ||
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====== Webcam ====== | ====== Webcam ====== | ||
+ | ===== SD Karte ===== | ||
+ | ==== Unterstützte SD-Karten verwenden ==== | ||
+ | |||
+ | |||
+ | Es gibt unter eLinux.org zwei Listen von unterstützten SD-Karten. Die genaue Bezeichnung kann mit | ||
+ | folgenden Befehlen extrahiert werden: | ||
+ | < | ||
+ | cd / | ||
+ | echo " | ||
+ | </ | ||
+ | |||
+ | Checklisten SD-Karten: | ||
+ | - http:// | ||
+ | - http:// | ||
+ | |||
+ | Eine unserer kaputten SD-Karten wird in der Liste auch als NICHT unterstützt aufgelistet: | ||
+ | Identifizierte Karte: | ||
+ | < | ||
+ | man: | ||
+ | </ | ||
+ | Listenauszug: | ||
+ | < | ||
+ | nok | ||
+ | </ | ||
+ | |||
+ | ==== Raspberry PI Firmware-Aktualisierung ==== | ||
+ | |||
+ | Eine veraltete Firmware bzw. Kernel kann zu Schreibproblemen auf die SD-Karte führen. | ||
+ | Ein Update wird mit dem Tool " | ||
+ | |||
+ | - SD-Karte am PC mounten und in /etc/fstab den Schreibschutz der Partitionen aufheben | ||
+ | - sudo rpi-update ausführen \\ Mögliche Probleme: | ||
+ | * Systemzeit stimmt nicht, kann z.B. via sudo ntpdate -u ntp.ubuntu.com synchronisiert werden | ||
+ | * SSL Zertifikate sind nicht mehr aktuell. In diesem Fall das Paket " | ||
+ | |||
+ | ==== Journaling auf der SD-Karte deaktivieren ==== | ||
+ | |||
+ | - Testen ob Journaling aktiviert ist: < | ||
+ | sudo dumpe2fs / | ||
+ | </ | ||
+ | - Wird die Option gefunden, so kann sie für EXT4 wiefolgt deaktiviert werden:< | ||
+ | sudo e2fsck / | ||
+ | sudo tune2fs -O^has_journal / | ||
+ | sudo e2fsck -f / | ||
+ | </ | ||
+ | - In /etc/fstab für die jeweiligen Partitionen die Option **data=writeback, | ||
+ | / | ||
+ | </ | ||
+ | |||
+ | ===== WIFI ===== | ||
+ | |||
+ | < | ||
+ | pi@raspberrypi: | ||
+ | # interfaces(5) file used by ifup(8) and ifdown(8) | ||
+ | |||
+ | # Please note that this file is written to be used with dhcpcd | ||
+ | # For static IP, consult / | ||
+ | |||
+ | # Include files from / | ||
+ | source-directory / | ||
+ | |||
+ | auto lo | ||
+ | iface lo inet loopback | ||
+ | |||
+ | iface eth0 inet dhcp | ||
+ | |||
+ | allow-hotplug wlan0 | ||
+ | iface wlan0 inet dhcp | ||
+ | wireless-essid < | ||
+ | </ | ||
+ | |||
+ | |||
+ | ===== Camera ===== | ||
+ | |||
+ | < | ||
+ | sudo apt-get install vlc-nox | ||
+ | sudo rmmod bcm2835-v4l2 | ||
+ | sudo modprobe bcm2835-v4l2 | ||
+ | </ | ||
+ | |||
+ | show driver info: | ||
+ | < | ||
+ | pi@raspberrypi: | ||
+ | Driver Info (not using libv4l2): | ||
+ | Driver name : bm2835 mmal | ||
+ | Card type : mmal service 16.1 | ||
+ | Bus info : platform: | ||
+ | Driver version: 4.1.13 | ||
+ | Capabilities | ||
+ | Video Capture | ||
+ | Video Overlay | ||
+ | Read/ | ||
+ | Streaming | ||
+ | Extended Pix Format | ||
+ | Device Capabilities | ||
+ | Device Caps : 0x05200005 | ||
+ | Video Capture | ||
+ | Video Overlay | ||
+ | Read/ | ||
+ | Streaming | ||
+ | Extended Pix Format | ||
+ | </ | ||
+ | |||
+ | configure v4l2 driver | ||
+ | |||
+ | show driver options | ||
+ | |||
+ | < | ||
+ | v4l2-ctl --list-ctrls | ||
+ | </ | ||
+ | < | ||
+ | # set (maximum) frame-rate | ||
+ | v4l2-ctl -p 15 | ||
+ | # set auto-exposure (for night-capture) | ||
+ | v4l2-ctl --set-ctrl=exposure_dynamic_framerate=1 | ||
+ | </ | ||
+ | |||
+ | start stream | ||
+ | < | ||
+ | cvlc v4l2:/// | ||
+ | | ||
+ | </ | ||
+ | |||
+ | anzeigen am client: | ||
+ | < | ||
+ | vlc http:// | ||
+ | </ | ||
+ | |||
+ | |||
+ | für " | ||
+ | < | ||
+ | sudo rmmod bcm2835-v4l2 | ||
+ | </ | ||
documentation/webcam.1449312977.txt.gz · Last modified: 2015/12/05 10:56 by nine