import subprocess, json
import os


def getMinfo(mediafile,chNl):
    if "ffconcat version 1.0" not in mediafile:
        from mutagen.mp4 import MP4
        mediafile = mediafile.replace("file ",chNl+"/").replace("'","")
        audio = MP4(mediafile)
        return str(audio.info.length)
    else:
        return ""

    
print getMinfo("file '2018-11-09/Ye_Hai_Mohabbatein_S43E1607.mp4'","StarPlus")