First – let me make it clear I have never tried this – so this is speculation.
There is no firewire connection on a PS3 – so I’m not sure how you think you can capture via it.
You could try an HDMI output from the PS3, into an HDMI capture box like the Intensity, or IO express. HOWEVER, as the HMDI output on a PS3 has HDCP copy protection on it (the scourge of the modern world – DRM hardware) I would expect some problems, like no signal. Not sure about games, but I’m pretty sure a movie would not play back via HDMI to a non-HDCP compliant device.
If you want to be sure of capturing video from a game, the most guaranteed option would be to use a FCP with an analogue capture card, and capture component video and analogue audio via a component video cable (available from all good retailers). At least that would avoid any HDMI compliance issues.
Edit Out Ltd
—————————-
FCP Editor/Trainer/System Consultant
EVS/VT Supervisor for live broadcast
RED camera transfer/post
Independent Director/Producer
https://www.blackmagic-design.com/casestudies/detail.asp?case=therydercup