how is a video input from a capture source processed?

[synapse_gh]

[topic moved and edited for clarity]

For example, let's say I've got a camera signal coming in through a Blackmagic card, into Res as an image source.

Is this data getting processed by the CPU, the GPU or both?

[Joris]

In the specific case of a BM card, the data is processed by the capture card itself and the GPU only. That's why BM is so incredibly low latency in Resolume. We get the texture straight from the capture card and throw it directly to the graphic card for further processing. The data has to pass via your motherboard, but it's not processed there.

In the case of other capture cards that we do not natively support, the data is first processed by Quicktime/ Directshow on the CPU. Then we get the resulting texture from there and pass it on the graphic card for rendering. It's a relatively quick step, but noticeably slower.

[synapse_gh]

I'll let the Blackmagic folks know they owe you a commission on their latest sale...

Thanks for the quick response!