xuv's notebook

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===== Nogold =====

==== Streaming server ====
Gstreamer + Icecast2

Stream a Xwindow into an Icecast server:
<code=bash>gst-launch ximagesrc ! videoscale ! video/x-raw-rgb,width=720,height=576 ! \
    ffmpegcolorspace ! theoraenc quality=16 ! oggmux ! \
    shout2send ip=localhost port=8000 password=hackme mount=test.ogg</code>
Theoraenc quality goes from 0 (bad) to 63 (excellent).

Stream a Fluxus window to icecast:
<code=bash>gst-launch ximagesrc xname="fluxus scratchpad 0.18" ! \
    ffmpegcolorspace ! theoraenc quality=16 ! oggmux ! \
    shout2send ip=localhost port=8000 password=hackme mount=test.ogg</code>
    
Stream from a video capture card to icecast:
<code=bash>gst-launch v4l2src ! videoscale ! video/x-raw-yuv,width=768,height=576 ! \
    ffmpegcolorspace ! theoraenc quality=16 ! oggmux ! \
    shout2send ip=localhost port=8000 password=hackme mount=test.ogg</code>
    
    
Launch VLC with no interface, fullscreen, without OnScreenDisplay and cropped (left+top+right+bottom)
<code=bash>cvlc -f --no-osd --crop 0+2+400+300 http://localhost:8000/test.ogg</code>
    
==== Ubuntu bugs and other things ====
=== White screen on second, third and fourth monitor ===

Especially with multiple sessions of Xwindow and Xinerama **disabled**.\\ 
BUG: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/885989 \\
Nautilus is buggy. Replaced with Thunar.

:!: Removing Nautilus from a clean Ubuntu will remove gnome-session and break the desktop. You don't want that. To keep a working gnome-session, I added the gnome3 ppa before removing nautilus. Which actually updated gnome-session in the process.
<code=bash>sudo add-apt-repository ppa:gnome3-team/gnome3</code>

And to get something like DISPLAY:=0.1 in the command line, you need to bee in Unity2D. Geez.

=== Cropping source videos ===
Since Noemie has done some editing to the videos. She has brought letterboxed videos to display. And since we wanted the image to be fullscreen. I cropped the video using FFMpeg:


<code=bash>ffmpeg -i input.dvd -vf "cropdetect=24:16:0" dummy.mpeg
</code>

detects where the cropping should happend. I could make calculations myself, but it was more fun to have it done by FFMpeg. 

<code=bash>ffmpeg -i input.dvd -vf "crop=720:432:0:72" -sameq -an cropped.dvd</code> 

Crops the video while keeping the quality the same, though removing the unecessary audio.




==== Combat Naval ====


  * [[https://fr.wikipedia.org/wiki/Bataille_navale_%28jeu%29|Combat naval]]
  * Risk

[[https://fr.wikipedia.org/wiki/Grille| Grille: ]]
  * Tron (spaciale, euclidienne)
  * And, Or, Xor, Nand (logique)
  * Décryptage (cryptologie) [[https://fr.wikipedia.org/wiki/Grille_de_Cardan| Grille de Cardan]]
  * [[https://fr.wikipedia.org/wiki/Grille_de_calcul| Grille de calcul]] (informatique)

==== Grille Nogold ====

  * ne bouge pas
  * se transforme
  * continue - discontinue
  * vide -plein
  * qqch circule
  * changement de couleur
  * pulsation colorée
  * disparition - appariton
  * pointillé - épaisseur ligne