Available video output drivers:
        xvmc    XVideo Motion Compensation
        xv      X11/Xv
        x11     X11 ( XImage/Shm )
        xover   General X11 driver for overlay capable video output drivers
        gl      X11 (OpenGL)
        gl2     X11 (OpenGL) - multiple textures version
        dga     DGA ( Direct Graphic Access V2.0 )
        sdl     SDL YUV/RGB/BGR renderer (SDL v1.1.7+ only!)
        aa      AAlib
        caca    libcaca
        vesa    VESA VBE 2.0 video output
        xvidix  X11 (VIDIX)
        cvidix  console VIDIX
        null    Null video output
        mpegpes Mpeg-PES to DVB card
        yuv4mpeg        yuv4mpeg output for mjpegtools
        png     PNG file
        jpeg    JPEG file
        gif89a  animated GIF output
        tga     Targa output
        pnm     PPM/PGM/PGMYUV file
        md5sum  md5sum of each frame