Look at the player in a video-based score's own video, for what is plain to see and hard to hear: which hand plays a note (a piano's staves), hand position, strumming, who plays a line. Returns one picture of frames, left to right then down, each labelled with its number, bar, beat and time, and per frame the written notes struck just before it (staff, name, ID). measures: up to 16 bars as numbered in the score, such as '9-12'; frames land just after attacks, spread over them. seconds: explicit times in the recording instead. frames: 1-16 (default 8). columns: 1-4; fewer columns show each frame larger. crop: [left, top, right, bottom] fractions of the frame, such as [0, 0.5, 1, 1] for its lower half (a keyboard below the hands). Works for uploaded videos and video pages (YouTube, Bilibili...); a page's pictures are fetched again, which takes a few seconds the first time. No credits; changes nothing. Never download the video yourself.