CS5... We'll be happy to provide more details about it in another...3 days, 15 hours, 31 mins...
Now if we're talking about CS4, yes, you can develop an exporter plug-in that uses CUDA for accelerated encoding. Elemental Technologies did this with their Elemental Accelerator. And Divide Frame built a CUDA-accelerated importer with their GPU Decoder.
can you elaborate now?
Our CUDA support in our accelerated renderer has been built to play well with others. We have considered providing a suite to allow exporters, when running in the same process as our accelerated render (i.e. when doing a direct export rather than queue up an encode to Adobe Media Encoder), to be able to access the rendered CUDA frames directly on the card, to avoid readback to memory. If you're interested in something like this, contact me offline using my email in the PPro SDK for the latest status.