Why not generate at 4K?
Runway’s 4K is an upscale tied to higher plans and metered through its API. Acuta does it on your own GPU with nothing per minute, and the clip is never uploaded for it.
How it works
- Generate in Runway
At 720p, as you already do.
- Drop the keeper into Acuta
Any aspect ratio, at least 720 pixels on the short edge, up to 10 minutes. Check three frames at actual pixels first.
- Export 4K
Your graphics card does the work. The file lands on your disk.
Questions
- Is 720p enough for 4K?
- Acuta takes anything with at least 720 pixels on the short edge. Judge the result on your clip in the preview.
- Is my clip uploaded?
- No. It is read from your disk, upscaled in the tab and written back.
- How long does it take?
- A 30-second export takes at least 2½ minutes on an M3 Max, plugged in, a floor, not a promise. Plug in: on battery, Apple silicon runs roughly an order of magnitude slower.
- How good is it?
- It slightly over-sharpens the mid-tones on video, by 8–10%. That was measured, never resolved, and not investigated, and it can read as a synthetic crispness on skin and on gradients when you look closely on a big display. Nobody has run a review of logos and small type, so check your own in the preview before you sign off.