struct.pack converts Python numbers into a representation of a C bynary data. <QIIHHHH is the format specification, where < means little-endian, H stands for unsigned-short int, and I is an unsigned int. Q is an unsigned long long.


QtGui.QMovie(QtCore.QBuffer(QtCore.QByteArray(data)).open(QtCore.QIODevice.ReadOnly), 'GIF')