I use Kinovea for indoor golf practice. I first record a video and annotate it so that the KVA file can be used as a common reference guide for subsequent recordings. I then use the reference guides (KVA) when recording subsequent swings and/or when reviewing a video in playback mode.
Using a common reference KVA file with other recordings is problematical though. Sometime Kinovea just crashes when loading the reference KVA file with a different MP4 file. I have enabled the drawing option “Visible for the entire video” but while this does make the annotations visible from start to finish, it does not fix the occasional crash. My work around is to edit the reference KVA file and collapse all the annotation drawings into one keyframe and reset the timestamps to 0.
It would be nice if there was an additional annotations mode that places all the annotations in one keyframe with a timestamp of 0. I think this would allow the KVA file to be reused with any video.