[FFmpeg-user] Hardware Acceleration on OS X

[Elliott Balsley]

I've read bits and pieces about ffmpeg's hardware acceleration, but can't find a full answer.
On OS X, is VDA the only supported hwaccel?  In what ways can it actually help?  I primarily use ffmpeg for x264 encodes, and libx264 does all the heavy lifting.
I have an octo-core Mac Pro with GTX570 (2.5GB), so it would be great to utilize that powerful GPU if possible.