how to batch extract all ac3 streams from .vob files?

[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 each vob.
So how to batch extract all ac3 streams included in vob files please?

[Baldrick]

I guess you have to use the map command.

Or maybe try pgcdemux,

Command line support
PgcDemux [option1] [option2] ... [option12] <ifo_input_file> <destination_folder>
option1: [-pgc, <pgcnumber>].      Selects the PGC number (from 1 to nPGCs). Default 1
option2: [-ang, <angnumber>].      Selects the Angle number (from 1 to n). Default 1
option3: [-vid, <vobid>].          Selects the Angle number (from 1 to n). Default 1
option4: [-cid, <vobid> <cellid>]. Selects a cell vobid (from 1 to n). Default 1
option5: {-m2v, -nom2v}. Extracts/No extracts video file. Default NO
option6: {-aud, -noaud}. Extracts/No extracts audio streams. Default YES
option7: {-sub, -nosub}. Extracts/No extracts subs streams. Default YES
option8: {-vob, -novob}. Generates a single PGC VOB. Default NO
option9: {-customvob <flags>}. Generates a custom VOB file. Flags:
           b: split VOB: one file per vob_id
		   n: write nav packs
		   v: write video packs
		   a: write audio packs
		   s: write subs packs
		   i: only first Iframe
		   l: patch LBA number
option10:{-cellt, -nocellt}. Generates a Celltimes.txt file. Only in PGC/VID mode. Default YES
option11:{-log, -nolog}. Generates a log file. Default YES
option12:{-menu, -title}. Domain. Default Title (except if filename is VIDEO_TS.IFO)

[Bjs]

Vobedit ... select ac3 and check complete title set.

[leghorn]

Or ReJig. It also has an option to fix the audio delay.