UFW PASSIVE FTP RASPERRY PI doesn't work anymore FIX

# cat /proc/sys/net/netfilter/nf_conntrack_helper
# 0
# echo 1 >  /proc/sys/net/netfilter/nf_conntrack_helper

# cat /proc/sys/net/netfilter/nf_conntrack_helper
#1

Fix the problem. 

Stop Opera browser to ask for unlocking keyring at startup

Use this option --password-store=basic

How to normalize sound using ffmpeg / python script ffmpeg-normalize

How to normalize audio using ffmpeg


from https://github.com/slhck/ffmpeg-normalize (thanks !)

Installation:

pip install ffmpeg-normalize

Usage:

ffmpeg-normalize [options] ...

Options:

• -f, --force — Force overwriting existing files
• -l, --level — dB level to normalize to [default: -26]
• -p, --prefix — Normalized file prefix [default: normalized]
• -t, --threshold — dB threshold below which the audio will be not adjusted [default: 0.5]
• -o, --dir — Create an output folder in stead of prefixing the file
• -m, --max — Normalize to the maximum (peak) volume instead of RMS
• -v, --verbose — Enable verbose output
• -n, --dry-run — Show what would be done, do not convert
• -d, --debug — Show debug output
• -u, --merge — Don’t create a separate WAV file but update the original file. Use in combination with -p to create a copy
• -a, --acodec — Set audio codec for ffmpeg (see “ffmpeg -encoders”) when merging. If not set, default from ffmpeg will be used.
• -e, --extra-options — Set extra options passed to ffmpeg (e.g. “-b:a 192k” to set audio bitrate)

Examples:

ffmpeg-normalize -v file.mp3
ffmpeg-normalize -v *.avi
ffmpeg-normalize -u -v -o -f -m -l -5 *.mp4
ffmpeg-normalize -u -v -a libfdk_aac -e "-b:a 192k" *.mkv 

Exemple perso

ffmpeg-normalize -v -u -o *.mp3

Attention ça réencode avec les paramètres par défaut de ffmpeg.

Pour changer les settings utiliser les options -a -e

Voir aussi http://superuser.com/questions/323119/how-can-i-normalize-audio-using-ffmpeg 

Thanks to http://superuser.com/users/48078/slhck

rotate, pad video to the screen size to post on the instagram story

Pour ajuster des vidéos faites en 640x480 et les ajuster à la taille de l'écran de l'alcaltel pixi 4 5" 848x480 afin de poster sur la story d'instagram tout en maîtrisant le cadre.

for file in *.mp4;do name=`/usr/bin/basename $file .mp4`;ffmpeg -i $file -vcodec libx264 -vf "transpose=1,pad=480:848:0:104" -c:a copy  resized/$name-resized.mp4;done

renaming files numbered - command line

ls | cat -n | while read n f; do mv "$f" "base-$n.extension"; done

Autoplay raspberrypi XBMC

Pour jouer automatiquement au démarrage une playlist de vidéos

http://www.raspberrypi.org/phpBB3/viewtopic.php?t=13689&p=239521

apt-get install xbmc-eventclients-xbmc-send

xbmc-send --action='PlayMedia("/home/pi/loire.m3u")' --action="PlayerControl(RepeatAll)"

os.system("xbmc-send --action='PlayMedia(\"/home/pi/loire.m3u\")' --action=\"PlayerControl(RepeatAll)\"")

http://stackoverflow.com/questions/89228/calling-an-external-command-in-python

http://wiki.xbmc.org/index.php?title=List_of_built-in_functions

how to post json with curl

curl -X POST -H "application/json" -d '{"key":"val"}' URL

UBUNTU 14.04 - network manager cli command nmcli

Pour gérer le network manager et lister les infos comme le DNS

nmcli  dev list

nmcli  dev list iface eth1|grep IP4