Hmm, that is very good news. My Canon A540 came with that exact cable setup. So I might be able to hook it up to the AV TX straight away. That would solve both the still and video shooting issues. Than I would use the ebay cam. only for FPV.
Now another question
The ebay video Tx is supposed to work with 9V eithe roff th ewall or through a 9V battery. Would I be pushing it if I powered it through my 3S flight pack? (or a seperate 3s pack rather than th eheavy 9V batteries?)