Muxing MP4 (Audio+Video) to M4A (Audio)

[meganoob]

Hello, I have many MP4 files that include video and AAC audio. I would like to batch mux these files to just have the audio in M4A format.

Using information from this forum, I am able to use MP4Box to demux and remux to achieve this result; however, I am unable to write a script to do it and doing this multi-step process will take too long. I am also happy to try a GUI that would achieve this. I tried YAMB (MP4Box) GUI and it was not able to do this batch sequence either. Any advice on how to do this?

Input: MP4 file with aac audio and video
Output: M4A file with only aac audio

Thank you for your help

[Cornucopia]

Too long? It won't really take any less time doing it in a batch script.

But if you want to try, I'd suggest ffmpeg.

ffmpeg -i input.mp4 -c:a copy -vn -sn output.m4a

should do it, just add %placeholder variables.

Scott

[arielacade]

Try this for batch

for %%a in ("*.mp4") do "mp4box.exe" -raw 2 "%%~na.mp4"
for %%a in ("*.mp4") do ren "%%~na_track2.aac" "%%~na.m4a"
pause

mp4box.exe must be in the same folder as the videos. It is suitable that you think a file bat with what I wrote and launch it.

[meganoob]

I was able to write the script by combining both of your responses:

Thanks!

[_Al_]

@echo off
set MP4box="C:\  .... your path to MP4Box    .... \MP4box.exe"
for %%a in ("*.mp4") do %MP4box% -add "%%~na.mp4"#audio   -new "%%~na.m4a"
pause