There will not be any other evidence unless you contest the charge in court. And you will get nothing more than a couple of legal formalities on a certificate unless you dispute the issue with expert evidence.
You might think you are the first person to think of this, but it is actually raised numerous times every day at Penalty Review Board, in the courts, and in my in box. Which is why I explained it all on http://www.trafficlaw.com.au/red.lights.html
This is saying because the system is almost right at every time, as a result no evidence is needed.
No. It's saying it is very hard to find a red light camera fine where the red light is not visible in the picture. Even if the red light is obscured by a sign or a truck, the evidence used in court is the text printed on the s.83A certificate, which includes the text you can see printed on the photo at fines.vic.gov.au.
The printed text is the evidence the police rely on at court to say the vehicle entered the intersection against a red light.
The photo identifies the offending vehicle.
Many people wrongly assume the photo is the evidence that the vehicle entered against the red light, when as you have pointed out it obviously can not do that. But it is best to think of it the same way as you do with a speed camera offence where the photo of the offending vehicle is not evidence of it's speed. All the photo does is identify the vehicle's rego. Other technologies record the speed and that data is incorporated in the certificate by printing it on the photo. It is exactly the same with red light cameras - other technologies record the state of the lights and the location of the vehicle and that data is then incorporated in the certificate.
In court the evidence is adduced by certificate to avoid the need for a human being to come to court to give that evidence.
But you could subpoena the Redflex traffic camera engineers to give evidence in court where you can suggest to them that they've designed a system that takes photos of cars that entered the intersection on yellow and see how that goes.