Listeners never hear the auction. PBS 2 pre-fetches ads, fanning out OpenRTB 3. Unlike CTV 21, audio runs minutes early — imp.exp signals the delay. Bids 4 return as VAST 4.1 zero-dimension MediaFiles 5, stitched into the stream 6.
FIELD NOTES
- rqddurs forces exact-second fill for live radio — dead air kills it
- 90%+ listen-through; completion is a poor signal — use quartiles
- imp.exp warns bidders of delay;
tells player to discard