Avidemux script - merge mp4 files in a folder

merge_mp4.py

#Avidemux script (works with Avidemux v 2.7.1)
#Merges all the mp4 files of a folder to a "_merged.mkv" file in the same folder

ext="mp4"
inputFolder=""
currentItemIndex=0

#
def loadOrAppend(filein):
    if(currentItemIndex==1):
        adm.loadVideo(filein)
    else:
        adm.appendVideo(filein)
#

# Main
#
ui=Gui()
adm=Avidemux()
#
inputFolder=ui.dirSelect("Select the source folder")
if not inputFolder:
    raise ValueError("no folder selected")
	
list=get_folder_content(inputFolder,ext)
if(list is None):
    raise ValueError("Could not find files")
	
for f in list:
        currentItemIndex=currentItemIndex+1
        loadOrAppend(f)

adm.setSourceTrackLanguage(0,"eng")
adm.save(inputFolder + "\\" + "_merged.mkv")
print("Done")