#smpte

TV and projector viewing-distance maths as an API, computed locally and deterministically. The distance endpoint takes a screen diagonal (inches or centimetres) and aspect ratio and returns the screen width and height and the recommended seating distance for each standard — SMPTE's 30° minimum viewing angle (the farthest comfortable seat), THX's 36° recommendation and THX's 40° maximum (the closest) — in inches, feet, centimetres and metres, plus an overall recommended range. Pass a resolution (720p, 1080p, 1440p, 4K or 8K) and it also gives the pixel-acuity distance, the point beyond which a 20/20 viewer can no longer resolve individual pixels, so moving closer stops adding detail. The screensize endpoint reverses it: from a seating distance it recommends the screen diagonal for each standard. The fov endpoint gives the horizontal field of view for a screen at a distance, with a verdict on whether it falls in the recommended range. The geometry is exact: width = diagonal × aspect-width / hypot(aspect), and distance = (width/2) / tan(angle/2). Everything is computed locally and deterministically, so it is instant and private. Ideal for home-theatre and AV apps, TV and monitor retail tools, room and seating planners, and AV-installer calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is viewing-distance geometry; for pixel density (PPI) from a resolution use a PPI API.

api.oanor.com/viewdistance-api

Convert SMPTE timecode for video, film and broadcast. Turn a timecode (HH:MM:SS:FF) into an absolute frame number or into real-time seconds, and turn a frame count back into a timecode — at 23.976, 24, 25, 29.97, 30, 50, 59.94 or 60 fps. Crucially it handles drop-frame correctly: at 29.97 and 59.94 fps it drops the right frame numbers each minute (notated with a semicolon, 01:00:00;00) so an hour of timecode lines up with an hour of real time, and it computes real seconds with the exact fractional rate (30000/1001). Perfect for NLE and editing tools, subtitle and caption timing, playout and broadcast automation, and media asset management. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from date/time, duration and relative-time tools.

api.oanor.com/timecode-api