Chapter Progress Rail

Everything below can be changed without touching the animation. Hand the list to an agent, or edit the values at the bottom of the component file.

• Chapters *

  chapters · array

  The video's chapters, in order — the same list you put in the description. Five or six is what a rail this wide reads well; past about nine the bars stop being separable.

  now: 6 items

• At *

  at · number

  Where the playhead starts, in minutes into the video. Set it a little before the chapter change you want the overlay to show, so the handoff happens on screen.

  now: 10

• Advance

  advance · number

  How many minutes of the video the rail travels across during the eight seconds. Compressed on purpose: at real time the cursor would move four pixels and there would be nothing to see, the same licence a counter takes when it counts up to a figure faster than the figure ever arrived. Set it to 0 to hold one fixed position.

  now: 12

• Edge

  edge · "bottom" | "top"

  Which edge the rail is bonded to. Bottom is the default and clears the player's own scrubber; top mirrors the whole assembly and hangs the chapter block under the rail, for cuts whose lower third is already spoken for.

  now: bottom

• Inset

  inset · number

  Distance from that edge as a fraction of the frame height. The default sits above YouTube's controls without floating away from the edge it is measuring.

  now: 0.075

• Remaining

  remaining · boolean

  Show the minutes-left block at the far end of the rail. This is the retention half of the device — the fill says how far you have come, this says how much is left — so leave it on unless the corner is taken.

  now: true

• Ground

  ground · boolean

  Paint the frame behind it. Off by default — this is an overlay, so it renders on an alpha channel and drops straight onto your own footage. On, it gets a brand ground so it can stand up on its own.

  now: true

• Scale

  scale · number

  Size of the rail and its type. The margin from the frame edge does not scale with it — that belongs to the frame, not to the object.

  now: 1

• Brand

  brand · string

  Brand token id — one of the keys of BRANDS. The display face travels with the palette, and 'circuit' is the condensed one these labels were fitted to.

  now: circuit