| Sub‑Feature | Functional Requirements | Non‑Functional Requirements | |-------------|------------------------|-----------------------------| | HW‑accelerated decoding | Detect GPU capabilities on Windows, macOS, Linux, Android TV, iOS. Use FFmpeg + platform‑specific APIs (DXVA2, NVDEC, VA‑API, VideoToolbox). Auto‑fallback to software if unsupported. | Latency < 30 ms for frame decode; < 5 % CPU usage for 4K HDR on supported hardware. | | Frame‑accurate seeking | Seek using key‑frame index + nearest‑frame interpolation (if codec supports). UI: draggable timeline with frame preview thumbnails. | < 100 ms delay from user input to frame display. | | 360°/VR playback | Detect headset (Oculus Quest, HTC Vive, Cardboard) via WebXR or native SDK. Provide yaw/pitch controls. | Maintain 90 fps on 4K equirectangular video with low motion sickness. | | Audio track & subtitle switching | Hot‑swap without stopping playback. Remember last used language per user profile. | Zero audible glitch (< 10 ms gap). | | Speed control + pitch correction | Use WSOLA or Rubber Band library for tempo change without pitch distortion. | Audio sync error < 20 ms across speed range. |
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