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Also note that a using ''.join() as in the function I'm using below is 
much faster than repeated string concatenation as in 
videoreader.py:

def convertPixmapToARGB(pixmap, width, height):
    rowbytes = Qdoffs.GetPixRowBytes(pixmap)
    start = 0
    rv = []
    getBytes = Qdoffs.GetPixMapBytes
    for i in xrange(height):
        nextline = getBytes(pixmap, start, width*4)
        start = start + rowbytes
        rv.append(nextline)
    rv = ''.join(rv)
    return rv