Is there a way to convert alot of video files from AC3 sound to AAC? I don't want to convert video iteself, video is okay, only the sound. I have alot of videos encoded with H.264 or mpeg4(xvid) and AC3 sound, in different containers (.avi, .mkv). I want to convert ONLY sound in them to AAC not touching the video format and container.

  • You need to more clearly describe what current situation is, what your problem is, and what you are trying to achieve. – David Dec 27 '15 at 19:15
  • Check whether it is possible to separate the sound track into a separate file. – whs Dec 27 '15 at 19:32

Best way to do this is to use FFmpeg in order to convert only the audio. Then, you can merge the original video and the converted AAC with MKVToolNix.



Convert the audio of multiple video files to AAC with a script in the send to context menu.


  1. Download FFmpeg
  2. Open the shell:sendto folder with the key combination [win]+[r]
  3. Create an empty batch file, for instance aac.bat
  4. Paste the following code FOR %%i IN (%*) DO ffmpeg -i "%%~fi" -c:v copy -c:a aac "%%~di%%~pi%%~ni_aac%%~xi"


Select the files you want to convert, right click on them, click on "Send to", and click on "aac.bat".


The script will create new files where "_aac" is added to the file names and the audio is converted to AAC.


I assumed you are running Windows. I tested the script with multiple MKV files with DTS audio on Windows 10.

FFmpg code

In case you want to specify the input and output files in another way you can use the code below.

ffmpeg -i "C:\input.mkv" -c:v copy -c:a aac "C:\output.mkv"

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