Every accessibility track in one place: subtitles vs captions vs SDH vs audio description, the delivery format for each (CEA-608/708, WebVTT, IMSC), the HLS and DASH player flags that identify them, and the 2026 EU and US rules.
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The book · Volume 3 of 7
Video Streaming: A Complete Guide to Video Delivery: From ABR and CDNs to Players, WebRTC, DRM, and the Economics of Streaming
This cheat sheet separates subtitles, captions, SDH and audio description, with the delivery format and the HLS and DASH player flags for each track. Volume 3 covers this player side in depth: subtitles and trick play, player behaviour and recovery, DRM and QoE monitoring, so accessibility tracks show up correctly on every screen. Written by Nikolay Sapunov, CEO at Fora Soft.
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