Synchronized horizontal and vertical video without compromises
summary
Claims synchronized horizontal and vertical streams deliver bespoke layouts without slicing away important elements and scale to audiences where roughly half of new Twitch viewers are primarily mobile users. The system uses client-side encoding and multitrack ERTMP, with broadcasters composing two canvases in OBS + ADOM vertical plugin. Playback adds a custom HLS attribute (IVS groups) and an opt‑in multivariant playlist so dual ladders stay synchronized and adaptive instead of mixing aspect ratios.
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chapters (9)
- 0:00Introduction
- 1:05Horizontal vs vertical video challenges
- 3:13Dual format solution
- 4:37Streamer dual format workflow
- 6:22Encoding dual format streams
- 7:04HLS playback issues
- 10:39Custom HLS attributes
- 12:04Player playback options
- 13:07Resources and closing
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