Looking to help making a Avidemux 2.6 MP4 append script

[jabuehle]

I am currently working on batch file to append mp4 files into one.
Currently I dont really know what I am doing but here is what I have.
for /f "tokens=1,2,3 delims=?" %%a in (join.txt) do ("c:\Program Files\Avidemux 2.6\avidemux.exe" --load "%%a.mp4" --append "%%b.mp4" --save "%%c.mp4")

Currently I am getting something failed when appending.

I think I need the Video Decoder that can be Lavcodec, Video Output and Audio Output that I like to copy, and might be missing the Output Format that I want the it MP4 Muxer.

Any help will be greatly appreciated

[mean]

add --output-format=mp4v2 and it should be ok