Hello,

My understanding is vidTime is referring to a particular timeline in a song, timelineRatio is the song timeline to Song duration. Frame is determined based on the length of the song split into 1000 frames to represent at different snapshot intervals how the user is progressing with the listening session. Think about it like at intervals split into 1000, a snapshot of the currrent listening session is taken, depending on what timeline of the song the user is in, the frame is captured which is just an equivalent representation of what section of a song a user is at.

Frame would be perfectly corrleated to vidTime since they all refer to a section of the song. So when Frame has dropped, vidTime should drop as well. If a user listened to a song without pauses, rewinds, forwards, vidTime and Frame should be increasing linearly. VidTime at the last frame would be similar/exact to VideoDuration. I'm still in the process of data understanding too. Hope this helps.