there are two information about streaming size in AVI files. One is chunk size in file header and the other is chunk size in index table.
In order to reduce index memory usage, loading time cost, and supporting avi streaming feature, Freescale's demuxer is not based on index table, but based on each chunk type and size.
We can only pick up one dumux method in our demuxer, and some AVI files that contained invalid chunk size in header can not be correct supported.
