reading .seq files from caltech pedestrian dataset

read_seq.py

def read_seq(path):
    
    def read_header(ifile):
        feed = ifile.read(4)
        norpix = ifile.read(24)
        version = struct.unpack('@i', ifile.read(4))
        length = struct.unpack('@i', ifile.read(4))
        assert(length != 1024)
        descr = ifile.read(512)
        params = [struct.unpack('@i', ifile.read(4))[0] for i in range(0,9)]
        fps = struct.unpack('@d', ifile.read(8))
        # skipping the rest
        ifile.read(432)
        image_ext = {100:'raw', 102:'jpg',201:'jpg',1:'png',2:'png'}
        return {'w':params[0],'h':params[1],
                'bdepth':params[2],
                'ext':image_ext[params[5]],
                'format':params[5],
                'size':params[4],
                'true_size':params[8],
                'num_frames':params[6]}
    
    ifile = open(path, 'rb')
    params = read_header(ifile)
    bytes = open(path, 'rb').read()

    # this is freaking magic, but it works
    extra = 8
    s = 1024
    seek = [0]*(params['num_frames']+1)
    seek[0] = 1024
    
    images = []
    
    for i in range(0, params['num_frames']):
        tmp = struct.unpack_from('@I', bytes[s:s+4])[0]
        s = seek[i] + tmp + extra
        if i == 0:
            val = struct.unpack_from('@B', bytes[s:s+1])[0]
            if val != 0:
                s -= 4
            else:
                extra += 8
                s += 8
        seek[i+1] = s
        nbytes = struct.unpack_from('@i', bytes[s:s+4])[0]
        I = bytes[s+4:s+nbytes]
        
        tmp_file = '/tmp/img%d.jpg' % i
        open(tmp_file, 'wb+').write(I)
        
        img = cv2.imread(tmp_file)
        img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        images.append(img)
    return images

Does this work?
I got the following error while I was trying this:

    nbytes = struct.unpack_from('@i', bytes[s:s+4])[0]
struct.error: unpack_from requires a buffer of at least 4 bytes

@anupamsobti it looks like the last bytes that it tries to unpack are blank. I just got it working by changing line 35.
for i in range(0, params['num_frames']-1):

I do have concerns that this might affect how annotations are read, but I haven't gotten there yet.

What all packages are required to run this Code? I am not getting any output now.