how to batch extract all ac3 streams from vob file?

[abducted]

hi !
I have vob files with multiple audio inside.
I would like to extract all the audio streams from all the vob files automatically.

I have tried this :

for %%a in ("*.vob") do ffmpeg -i %%a -vn -acodec copy %%~na.ac3

but this will extract only one ac3 track from the vobs, not all of them.
So how to batch extract all ac3 streams from the vob files please?

[cehoyos]

This is not a support forum (but a bug tracker), please see http://ffmpeg.org/contact.html for the mailing lists, ffmpeg-user should be appropriate for your question.

You will have to parse the output of ffmpeg -i or ffprobe to find out how many ac3 streams you have to export (and to find out the correct -map parameters).