import glob
import os

if __name__ == "__main__":
    res = glob.glob('*.MP4')
    code='GH'
    groups = {}
    for r in res:
        seq = r[2:4]
        prefix = r[4:8]
        code=r[:2]
        groups.setdefault(prefix, []).append(seq)

    wr = open('input.txt', 'w')
    # sort keys
    keys = list(groups.keys())

    keys.sort()

    for k in keys:

        sequences = groups[k]
        sequences.sort()

        for seq in sequences:
            fn = 'file %s%s%s.MP4\n' % (code, seq, k,)
            wr.write(fn)

    wr.close()
    os.system(
        'ffmpeg -f concat -i input.txt -c copy output.mp4')
    # # # os.system(
    # # #     'docker run -v "$(pwd)":"$(pwd)" -w "$(pwd)" jrottenberg/ffmpeg -f concat -i input.txt -c copy output.mp4')

    os.system('rm input.txt')