roberto dircio palacios-macedo's notepad

stream a webcam, using highly compressed h264 instead of typical mpg

nospam@example.com (rdircio) — 2010-08-26T18:53:51Z

Got a logitech webcam c300, it uses the "uvcvideo" kernel module.

Typically you would grab video using "motion" and stream it on mpeg, well that's rubbish if you want better compression, so let's do it using the best of the best: h264.

#!/bin/ksh

DEV=/dev/logitechcam
ps -ef | grep -i vlc | grep -v grep |grep -i logitechcam | awk '{ print $2 }'| while read P;do
kill -9 $P
done

VLC="/usr/local/bin/cvlc v4l2://$DEV :input=2 :input-slave=alsa://hw:2,0 --alsa-samplerate=32000 --v4l2-controls-reset --v4l2-auto-white-balance=1 --v4l2-do-white-balance=1 --v4l2-autogain=1 --sout "

CAM="transcode{vcodec=h264,acodec=mp4a,width=320,height=240,vb=64,ab=24,channels=1,venc=x264}:standard{access=http,dst=0.0.0.0:8090/stream.flv}"

#CAM="transcode{vcodec=mjpg,width=320,height=240}:duplicate{dst=std{access=http{mime=multipart/x-mixed-replace;boundary=--7b3cc56e5f51db803f790dad720ed50a}.mux=mpjpeg,dst=0.0.0.0:8090/m.mjpg}}"

${VLC} "#$CAM"

this produces a very decent quality stream at around 100kbps, audio also included!

Enjoy!

Test nics to see if we're on the desired vlan

nospam@example.com (rdircio) — 2010-08-20T14:35:54Z

You want to know if one of your nics is in the vlan you need it to be? Quite tedious if you want to do it manually.

check this small script to config the ip, ping and unconfig

for i in 1 2 3 4 5 6 7 8 9 10 11;do set -x;ifconfig eth$i inet 10.203.102.102 netmask 255.255.254.0 up; ping -c 5 10.203.102.1; ifconfig eth$i down; done

Create LVM structures

nospam@example.com (rdircio) — 2010-08-06T08:27:43Z

for eaach disk to include in a volume group, initialize it as a LVM disk:

pvcreate /dev/sdX

create a volume group with that disk:

vgcreate myvg /dev/sdX

Create a 20gb volume called "myvol" inside the "myvg" volume group:

lvcreate -L 20g -n myvol myvg

Make a filesystem in the new volume:

mkfs.ext3 /dev/mapper/myvg-myvol

Adding udev rules

nospam@example.com (rdircio) — 2010-07-12T22:38:55Z

I inspected all the devices i wanted to add to udev using "udevadm info" for each path i knew was the device i needed.

udevadm info -a -p $(udevadm info -q path -n /dev/video1)
udevadm info -a -p $(udevadm info -q path -n /dev/video0)
udevadm info -a -p $(udevadm info -q path -n /dev/input/mouse1)
udevadm info -a -p $(udevadm info -q path -n /dev/input/event1)
udevadm info -a -p $(udevadm info -q path -n /dev/input/event2)
udevadm info -a -p $(udevadm info -q path -n /dev/input/mouse2)

Then just created the udev file /etc/udev/rules.d/95-my.rules

KERNEL=="video*", SUBSYSTEM=="video4linux", ATTR{name}=="saa7133*", SYMLINK+="tvcard"
SUBSYSTEM=="video4linux", ATTR{name}=="gspca main driver", SYMLINK+="geniuscam"
KERNEL=="mouse*", ATTRS{name}=="Microsoft Basic Optical Mouse", SYMLINK+="input/cecimouse"
KERNEL=="event*", ATTRS{name}=="AT Translated Set 2 keyboard", SYMLINK+="input/cecikb"
KERNEL=="event*", ATTRS{name}=="Logitech Logitech USB Keyboard", SYMLINK+="input/betokb"
KERNEL=="mouse*", ATTRS{name}=="USB Optical Mouse", SYMLINK+="input/betomouse"

reboot, and i get pretty aliases for all my devs :)

Get asterisk music-on-hold live from an icecast+ices2 server

nospam@example.com (rdircio) — 2010-07-12T18:19:34Z

My asterisk version is 1.6.2.6

My freepbx version is 2.7.0.1

To get music-on-hold from a live source, i made a script (/scripts/streamx.ksh):

#!/bin/ksh
/usr/bin/ogg123 -q -b 128 -p 32 -d wav -f - http://kraftek.com:8000/stream.ogg| sox -t wav - -r 8000 -c 1 -t raw - vol 0.10

and configured /etc/asterisk/musiconhold_additional.ksh with:

[default]
mode=custom
application=/scripts/streamx.ksh

And that is it!, just dial a conference room and you'll get live music on hold while waiting for your friends to join :)

See a live list of open connections to mysql

nospam@example.com (rdircio) — 2010-07-06T16:43:54Z

watch 'mysql -e "show processlist;"'