Ahead announced support for NVIDIA's CUDA in Nero's Move it application today at CeBIT. The encoder is targetted at people wanting to create AV for mobile devices like the PSP, iPhone and T-Mobile G1, and for low-def online use on places like YouTube, but it can also do Full HD stuff as well. Read the full news item
why did they not use OpenCL so that they can take advantage of a potentially larger base including ATI GPUs?
OpenCL isn't ready for the public to use yet. I can imagine it won't be a stable consumer thing until the end of the year. With the strong similarity between CUDA and OpenCL it shouldn't be difficult to port - if they can be bothered. Jawed
I think, that they will use Nvidia's NvPVEnc (which is part of the Force Ware Package), so the same way like Power Director 7 (it uses not only NvPVEnc, but AVIVO for transcoding on Radeons, too). The real cool news is, that ArcSoft Total Media Theater uses CUDA for upscaling SD movies (they say there is a small problem with the current Catalyst release, which will be fixed soon, so there will be upscaling on Radeons, too).