A handful of the tools in ACR will change frame to frame. Simply put, ACR was designed for photography, one picture at a time only. Introducing a stream of images will have a flickering effect. I recommend only using exposure, white balance, lens corrections, sharpening. Do not use shadows/highlights, blacks/whites, clarity, contrast. Grain will have the same grain pattern with each frame. Doesn't look natural. You can use noise reduction, but something like Neat Video or Denoiser work better. You may be able to use split toning. If you want a "clarity" look, Magic Bullet Looks has a Pop filter. Or, an unsharpen mask which is right in Premiere and AFX. While they don't do what ACR's clarity does exactly, it is worth experimenting to see if it fits the style you want.