So you might have more codes SSM Subaru specific stored in your ecu. They might help with your diagnostics.
See this post for reading all engine codes on your odometer:
http://forum.liberty.asn.au/viewtopic.php?f=6&t=34980From the video it sounds like you got a backfire in your intake manifold: this means you have fuel but it’s igniting in the wrong place.
Your battery is going flat so use a maintenance charger when you’re not trying to start it.
Ideally get the battery load tested by a specialist eg Battery World or diy test it and make sure it’s fully charged before attempting to start.