python ffmpeg concat 28 29 many files

1def concatenate():
2	stringa = "ffmpeg -i \"concat:"
3	elenco_video = glob.glob("*.mp4")
4	elenco_file_temp = []
5	for f in elenco_video:
6		file = "temp" + str(elenco_video.index(f) + 1) + ".ts"
7		os.system("ffmpeg -i " + f + " -c copy -bsf:v h264_mp4toannexb -f mpegts " + file)
8		elenco_file_temp.append(file)
9	print(elenco_file_temp)
10	for f in elenco_file_temp:
11		stringa += f
12		if elenco_file_temp.index(f) != len(elenco_file_temp)-1:
13			stringa += "|"
14		else:
15			stringa += "\" -c copy  -bsf:a aac_adtstoasc output.mp4"
16	print(stringa)
17	os.system(stringa)
18 
19concatenate()
20