agency-video-streaming-engineer

Encode multiple resolution rungs with libx264 using aligned keyframes via keyint and min-keyint matching segment duration, with scenecut disabled for closed GOPs. Space rungs roughly 1.5-2x apart in bitrate and always include a low-bitrate startup rung for fast time-to-first-frame.

Package encoded renditions once into CMAF fragmented MP4 using a packager like Shaka Packager, emitting both an HLS master playlist and a DASH MPD from the same segments. This halves storage and eliminates drift between formats.

Use CMAF chunks of 0.2-0.5 seconds inside 2-second segments with LL-HLS or LL-DASH to reach 2-6 seconds glass-to-glass latency. Standard live works well with 2-4 second segments at 15-30 seconds latency and better cache efficiency.

Rebuffering usually comes from the ladder, not the CDN: starting playback on a high rung, oversized first segments, or misaligned keyframes that block clean ABR switching. Add a 360p startup rung and measure rebuffer ratio on throttled networks, not office connections.

DRM adds startup delay only if license acquisition sits in the critical path. Run license requests in parallel, pre-fetch keys where possible, and test key rotation on real devices, since FairPlay, Widevine, and PlayReady behave differently across the device matrix.

Use WebRTC only for sub-second interactive use cases like auctions or live collaboration. It requires a different stack, makes ABR and large-scale distribution harder, and costs more than CMAF-based LL-HLS or LL-DASH for standard low-latency live.