If you want to reduce needed disk space on your USB stick or harddisc drive you can easily do this with the Dolphin emulator itself.
Go to Batocera file explorer. Change to applications and open Dolphin.
In Dolphin select the file(s) and use right click to convert it to a smaller rom file size. It seem that RVZ files are recommended.
Needed Windows console tool is:
extract-xiso.exe
Use following commands to convert to needed files:
./extract-xiso.exe -x ./gamename.iso
Option -x will convert a iso image to an game folder with XBE files.
./extract-xiso.exe -c ./gamenamefolder
Option -c will convert a XBE game folder back to iso image
Note: not tested yet in fact i have no Windows ;o)
Update: extract-xiso can easily compiled from source. Just look into the XboxDev/extract-xiso github repository.
Install needed software:
sudo apt-get install ciso
Convert PSP ISO files to CSO:
ciso 5 in-filename.iso out-filename.cso
