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import struct

class MP4Container(object):
    def __init__(self, filename):
        with open(filename,'rb') as fd:
            self.read_tags(fd)

    def skip(self, fd, block_size):
        fd.seek(block_size,1)
        #data = fd.read(block_size)
        #print repr(data[:100])
        
    def read_tags(self, fd, block_size=1e99):
        rd = 0
        while rd<block_size:
            head = fd.read(8)
            if not head: break
            size,tag = struct.unpack('>i4s', head)
            print tag,size
            self.TAGS.get(tag,MP4Container.skip)(self, fd, size-8)
            rd+=size
            
    def time2sample(self, fd, block_size):
        assert block_size>8
        version, entry_count = struct.unpack('>ii',fd.read(8))
        print hex(version), entry_count
        assert block_size-8 == entry_count*8
        entries = zip(*[iter(struct.unpack('>%di'%(entry_count*2), fd.read(entry_count*8)))]*2)
        print entries
        
    TAGS = {
        'moov':read_tags,
        'trak':read_tags,
        'mdia':read_tags,
        'minf':read_tags,
        'stbl':read_tags,
        'stts':time2sample,
    }

MP4Container('beispiel.mp4')