Raw videos source

[Stephen R. Savage]

rawz.Source(string source, int "width", int "height", int "format",
    string "packing", string "offset", int "alignment", int "y4m", bint "alpha",
    int "fpsnum", int "fpsden", int "sarnum", int "sarden")

Packing modes:
    argb
    rgba
    rgb
    rgb30
    nv
    yuyv
    uyvy
    v210

Examples:
    # Y4M
    core.rawz.Source('akiyo_cif.y4m')
    # Raw YUV
    core.rawz.Source('yuv420p8_720x480.yuv', width=720, height=480, format=vs.YUV420P8)
    # Interleaved file
    core.rawz.Source('rgb48_192x108.bin', width=192, height=108, format=vs.RGB48, packing='rgb')
    # Raw pixels embedded in a container (log2alignment=2)
    core.rawz.Source('32bit.bmp', width=640, height=400, format='rgba', packing='rgba', offset=0x8A, alignment=2)

FAQ:
    Q: The color channels are in the wrong order?
    A: std.ShufflePlanes 
    Q: How to open packed 16-bit raws?
    A: Choose the appropriate packing mode and set 'format' to a 16-bit type.
    Q: I can haz errar?
    A: plz2giv sample