Frequently asked questions¶
Do I need to install anything?¶
No. Everything is in the browser.
How many throws can I analyse?¶
Your invitation includes a set number of analyses. Re-running the same throw uses another one, so it is worth reading What makes a good video before you spend the first. If you run out and want more, ask.
Does uploading a video analyse it?¶
Depending on your account, either it starts automatically or you press the ⚡ button on
the throw card. Both are covered in What happens next.
How long does it take?¶
A complete run has been measured at about 15 minutes, most of the first six of which is waiting for a graphics server before your video is looked at. You can close the browser; it keeps going.
The turn count is wrong.¶
Mark the turn boundaries yourself and re-run — When tracking fails, "Fixing the phases".
The hammer's path jumps around, or disappears.¶
That is the tracker losing the ball. Mark it in the frames it lost and re-run — When tracking fails, "Fixing the hammer".
Release is marked in the wrong place.¶
Tag the correct frame and re-run. Same page, "Fixing the phases".
Why is the estimated distance different from what I measured?¶
It is calculated from the release, and knows nothing about the wind or where the ball actually landed. Use it to compare throws against each other rather than as an absolute.
I re-ran the same video and got slightly different numbers.¶
The analysis re-does the tracking from the video each time, so small differences are expected. Large differences usually mean the tracking was marginal — worth marking up.
Can I share my results with my coach?¶
Save the report as a PDF from the report page.
Can I film with a phone?¶
Yes. Almost all of it is filmed on phones. What makes a good video.
Can I use slow motion?¶
No. Phone slow-motion modes rewrite the timing information the speed is calculated from.
Is my footage visible to anyone else?¶
Your throws are yours. Nothing is published anywhere by ThrowSage.