§ help & troubleshooting
Most questions are answered below. If yours isn't, write directly — a real person reads every message, and you'll usually hear back the same week.
Video Stabilizer Pro is a one-developer indie app. Emails come directly to Dennis in Berlin, get read the same day, and almost always get a reply within a couple of business days.
Make sure Video Stabilizer Pro has Photos write access in iOS Settings → Privacy & Security → Photos. For very long clips, free a few GB of storage and keep the app foregrounded during render.
Open the paywall sheet again and tap Restore Purchases. If you bought on a different Apple ID, sign in with that account first — purchases are tied to the ID that paid.
Raise the strength dial, or tap Steady or Cinematic. Strength is the crop budget the app may spend on corrections — more budget, steadier shot. The trim it will need is shown before you commit.
Lower the strength dial — Balanced or Subtle. Strength caps how much of the frame may be trimmed; the app always crops the least the shot actually needs, so calmer clips stay wide either way.
Since 1.1 the engine corrects pan, roll and scale, so tilt is smoothed rather than left in. What can survive is keystone wobble — the frame leaning as you pitch or yaw the phone. That is measured but not yet corrected.
The pipeline passthrough-copies the source's audio track unchanged. If the original clip has no audio (silent or muted at capture), the stabilized output won't have any either.
Pro is a one-time purchase tied to your Apple ID. We don't store entitlements on a server — restoring goes through Apple's StoreKit, which already has your purchase on file.
Restore Purchases..mov container, written by Apple's AVAssetWriter. The original audio track is passthrough-copied without re-encoding. Color and orientation are preserved from the source's preferredTransform.@Observable, PhotosPicker, and async AVAsset APIs introduced in that generation.
VNHomographicImageRegistrationRequest, reduced to a similarity per frame. Keystone from pitch/yaw and lens distortion are not corrected yet.
Vision-based motion estimation, an optimal camera path planned inside a crop budget, audio passthrough, HDR preserved — on-device end-to-end, on iPhone, iPad and Mac.
Measured with a full homography and steadied as a similarity — pan, roll and scale. Perspective correction for pitch/yaw keystone is built but still off by default.
Smoother response on intentional pans, plus a bounded-window streaming pipeline so multi-minute clips don't analyze in full before rendering.
Bug reports, feature requests, or general thoughts — all go to the same address, and all get read.