transcode a mjpeg ip cam on demand with a cgi script using ffmpeg 
Tuesday, October 9, 2012, 11:04 - System, Web, Network
Posted by Administrator
To minimize bandwidth for video streaming i have to transcode mjpeg to h264.
To do this on demand ffserver is no option for me.
Therefore a small cgi script on the webserver with ffmpeg did the trick:

#!/bin/bash

echo -e "Content-type: video/avi\n"

#ffmpeg -an -analyzeduration 0 -f mjpeg -r 8 -i http://IP_CAM:PORT \
#       -c:v libx264 -preset ultrafast -r 8 -threads 2 -b:v 150k -f avi - 2>/dev/null &

avconv -an -analyzeduration 0 -f mjpeg -r 8 -i http://IP_CAM:PORT \
       -c:v libx264 -pre ultrafast -r 8 -threads 2 -b:v 150k -f avi - 2>/dev/null &
pid=$!
trap "kill $pid" SIGTERM SIGPIPE
wait


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port forward with iptables 
Thursday, October 4, 2012, 11:22 - System, Network
Posted by Administrator
iptables -I FORWARD -i INTERFACE -p tcp --dport PORT -j ACCEPT
iptables -A PREROUTING -t nat -i INTERFACE -p tcp --dport PORT -j DNAT --to-destination LOCAL_IP


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apt-get behind a server port redirected with ssh to a proxy 
Tuesday, August 28, 2012, 10:44 - System, Network, Debian/Ubuntu
Posted by Administrator
There is an apt proxy (Apt-Cacher NG), a workstation, a server and a server behind that server.
workstation> ssh -R3142:proxy:3142 server

server> ssh -R3142:127.0.0.1:3142 server_behind

server_behind> cat /etc/apt/apt.conf.d/01proxy
Acquire::http { Proxy "http://localhost:3142"; }

server_behind> apt-get update; apt-get upgrade


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Ubuntu Wake on Lan WOL 
Monday, August 27, 2012, 11:32 - System, Debian/Ubuntu
Posted by Administrator
If ethtool ethX doesn't contain Wake-on: g then add pre-down /sbin/ethtool -s ethX wol g to /etc/network/interfaces

Add NETDOWN=no to /etc/default/halt

Test with /sbin/shutdown -P now and wakeonlan [-i BROADCASTADDR] MAC (apt-get install wakeonlan)

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Find duplicate filenames 
Sunday, August 26, 2012, 16:19 - System
Posted by Administrator
find -type f -printf "%f\n" | sort | uniq -d


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