Stuck on something?Write to us anytime.

Slow motion needs a lot of light, about four times what the normal camera needs. Move to daylight or a bright cage, and keep the sun behind the phone, not in the lens.

• A dim gym or cage will not work for spin. Speed can still read in dim light, with more noise.
• In dim light the app can film at 120 frames a second instead of 240. Spin needs 240.
• Do not throw into a white or light wall; the ball can disappear against it. Use a net, or hang something dark.

The pitcher’s body is covering the ball right after it leaves his hand. Two fixes:

• Move the phone out to the pitcher’s throwing-arm side, about 4 feet from his line, and 5 to 7 feet behind the rubber. From there the ball clears his body sooner.
• Or measure the distance from the phone’s lens to the spot on the net where pitches land, and enter it. Then the app does not need to see the release.

Where the phone goes, with a picture

The phone must not move while you film a set, because the app reads the ball’s flight against a fixed picture.

• Tighten the tripod and keep it clear of the pitcher’s stride and follow-through.
• If the phone gets bumped, set it up again: aim, level the line until it turns gold, tap the net, and enter any distances again.
• If it says the phone was not level, turn it until the on-screen line is gold before the next pitch.

If the ball is tiny at the net, the app has less to measure.

• Move the phone closer, within 5 to 7 feet behind the rubber.
• Stay on the normal 1x lens. Zooming in at 240 frames a second only enlarges the picture. It adds no detail.
• Film at 1080p, and keep the whole flight to the net in view.

VeloVision refuses a result it does not trust, and tells you why, instead of guessing. The usual causes:

• The ball was hidden or left the picture before it reached the net. Aim so the whole flight is in view, and move the phone a step to the side.
• Something crossed in front of the phone. Keep the area between the phone and the net clear.
• The ball disappeared against a light wall. Use a net or a dark backdrop.
• The clip is too long or has other throws in it. Film one pitch per clip.

A speed marked Estimate means you did not enter a distance. Measuring the distance from the lens to the spot on the net gives a firmer number.

One tap on the net locks focus and brightness. If you skip it, the picture can refocus or change brightness in the middle of a throw, and the ball gets harder to follow. Tap the net before you start, and do not move the phone after that.

VeloVision films in slow motion, 1080p at 240 frames a second. Check that the frame rate in the app’s Settings says 240.

• If it says only a few frames of the flight were seen, use slow motion: 240, or 120 in dim light.
• If it says the video was slowed down after filming, pick it again and allow Photos access when asked, so the app can read the original. Or film inside the app.

Netting in front of the lens hides the ball. Put the phone inside the cage, or press the lens right up against the net. Use 240 frames a second and stand the tripod back so more of the ball’s flight is in view.

Use Reset password on the sign-in screen and we email you a link. That gets you back into your account.

It does not reopen your old Cloud library videos. Those are locked with a key only you hold, made from your password. To open them again you need your old password or your recovery code, the code the app showed you once when you made your account. Keep it somewhere safe.

If you lose both the password and the recovery code, nobody can open the old videos, including us. Your numbers and results are not affected.

The app shows it once, when you create your account. We do not keep a copy, so we cannot send it to you. Check where you saved it: a password manager, a note or a screenshot you took.

Download VeloVision, sign in with your email and password, and your library comes back: your history, the numbers and thumbnails, and each video when you tap it. With Free and no account, clips stay on the old phone only.