True headless capture
Android Foreground Service + MediaCodec H.264 High, 1080p60, CBR ~7 Mbps, GOP=1 s (IDR/sec). Writes 1 s CMAF m4s into a 10:00 rolling buffer.
Headless multi-camera capture for grassroots cricket
Two Android cameras act like field cams. A universal iOS/iPadOS Director fetches only the last 30 s in full quality for instant review. MARK key moments to auto-save a 12 s clip (−8/+4). LAN-only. No cloud. No transcoding.
Director-led HQ review
Director pulls only the last 30 s from selected cameras over HTTP (LAN) and plays progressively via AVFoundation. No preview-quality stream.
MARK & export
Tap WICKET/FOUR/SIX to save a 12 s clip (−8/+4) as fast-start MP4 with metadata. ISO masters remain on the cameras.
Key features
- mDNS/Bonjour discovery; QR/PIN pairing; per-match enrollment with HMAC tokens
- Clock sync via clap + drift pings every 5 s (apply ≤ ±50 ms/update)
- HTTP-first transport; optional WebRTC DataChannel (unordered) toggle
- Thermal policy: never alter quality mid-over; serve slowly before stepping fps between overs
System sketch
