Subaru EJ25 cold start issue

[samdale]

Bought a Forester STI recently and it's been a great all round car until now.

Come to start the car and get one cough and then nothing. No amount of cranking will result in another fire.
Wait, try again, same thing. Car has so far always managed to start if I keep persevering with this method. Say half a dozen times. Car then fires up fine and idles normally.

https://youtu.be/QSTyIodKlu0

Any ideas?

[samdale]

Hard to tell in isolation, but having just started my MR2 it sounds much stronger. Could just be the battery.