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iOS Player SDK: sideloaded subtitles, fullscreen rotation, and precision seek

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OCT 22, 2026
NewVideo Player

The FastPix iOS Player SDK adds three capabilities for richer playback control: sideloaded subtitles, fullscreen rotation that reports what actually happened, and precision seeking.

What’s new:

  • Sideload external subtitles: register a WebVTT or SubRip file that is not in the HLS manifest, served from your own storage, and select it alongside in-manifest tracks. SubRip is converted to WebVTT on the device, registration is synchronous with no I/O, and load faults are reported through the delegate. External cues render through the host, so you draw them yourself. See Sideload external subtitles.

  • Rotate video for fullscreen: rotation is requested through UIWindowScene.requestGeometryUpdate (public API, iOS 16+, no private KVC), and the SDK reads back the orientation the system actually settled on. Every request, granted or refused, is reported with a reason, and videoFillMode chooses how the picture fills the frame. See Rotate video for fullscreen.

  • Seek with precision: ask how precisely a seek should land with .exact or .nearestKeyframe(tolerance:), then read back where it actually landed, computed in rational media time. Scrub gestures coalesce into a single seek, frame stepping refuses with a typed reason instead of guessing, and wall-clock and live-edge seeking are supported for date-addressable live streams. See Seek with precision.