====== RPI - Vidéo ======

EDITEUR / INTERPRETEUR IDLE (programming idel python 3)

lancer un programme depuis Python
http://stackoverflow.com/questions/89228/calling-an-external-command-in-python

http://elinux.org/Omxplayer
https://learn.adafruit.com/raspberry-pi-video-looper/omxplayer

To use omxplayer you'll want to make sure your video is encoded with an H.264 codec and is in a file format like .avi, .mov, .mkv, .mp4, or .m4v.  If you have a video in a different format or that won't play you convert it into an H.264 video easily with some free tools.
For converting a video to H.264 that omxplayer can play I recommend the Handbrake video transcoder tool.  This tool is available for free for Windows, Mac, and Linux machines, and has a relatively simple interface


omxplayer /opt/vc/src/hello_pi/hello_video/test.h264


Control - C pour  terminer

 SCRIPT #1 - subprocess
    import subprocess
    subprocess.call(['omxplayer --alpha 100 test.mkv'], shell=True)


    SCRIPT #2 - os
    import os
    TheCommand ="omxplayer /opt/vc/src/hello_pi/hello_video/test.h264"
    os.system(TheCommand)


    SCRIPT #3 - argument
    import os
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument("val", help="transparency", type=int)
    args = parser.parse_args()
    os.system("omxplayer --alpha args.val /opt/vc/src/hello_pi/hello_video/test.h264")



    SCRIPT #4- keyboard
    import os
    val = input("Ready ? ")
    print type(val)
    os.system("omxplayer --alpha " + str(val) + " /opt/vc/src/hello_pi/hello_video/test.h264")



    SCRIPT #5- keyboard (mieux)
    import os
    val = input("Transparence ? ")
    val2 = 90
    command = "omxplayer --alpha {} --orientation {} /opt/vc/src/hello_pi/hello_video/test.h264".format(val, val2)
    os.system(command)