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Doesn't ffmpeg support hardware encoders like Nvidia's nvenc or Intel's idontrememberthename? Aldo AMD, most likely.

I know Handbrake supports it, as I used it for my productions in the fast. And I think handbrake uses ffmpeg, maybe?

Yes it does. I am using hw acceleration. This is using mac hardware so not all options are available, but the ones I have tried do not make significant difference.

Make sure both your decoding and encoding are on hardware, then. You might be cycling frames through system RAM.

Are you sure you are using the h264_videotoolbox options? I mean, you might be, but that, for me, seems to be the problem. Ffmpeg is quite fast if you can invoke the hardware encoders.

Yes I am using videotoolbox. I need to clarify that ffmpeg is not slow (it runs close to realtime bit under 20 fps) problem is that other tools reach 72 frames per second.

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