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

apt-mark pour lister les paquets hold, auto, manual - UBUNTU

Pour  lister tous les paquets qui sont hold

apt-mark showhold

extrait du man page de apt-mark

DESCRIPTION

       apt-mark will change whether a package has been marked as being
       automatically installed.

       When you request that a package is installed, and as a result other
       packages are installed to satisfy its dependencies, the dependencies
       are marked as being automatically installed. Once these automatically
       installed packages are no longer depended on by any manually installed
       packages, they will be removed by e.g.  apt-get or aptitude.

       auto
           auto is used to mark a package as being automatically installed,
           which will cause the package to be removed when no more manually
           installed packages depend on this package.

       manual
           manual is used to mark a package as being manually installed, which
           will prevent the package from being automatically removed if no
           other packages depend on it.

       hold
           hold is used to mark a package as held back, which will prevent the
           package from being automatically installed, upgraded or removed.
           The command is only a wrapper around dpkg --set-selections and the
           state is therefore maintained by dpkg(1) and not affected by the
           --file option.

       unhold
           unhold is used to cancel a previously set hold on a package to
           allow all actions again.

       showauto
           showauto is used to print a list of automatically installed
           packages with each package on a new line. All automatically
           installed packages will be listed if no package is given. If
           packages are given only those which are automatically installed
           will be shown.

       showmanual
           showmanual can be used in the same way as showauto except that it
           will print a list of manually installed packages instead.

       showhold
           showhold is used to print a list of packages on hold in the same
           way as for the other show commands.