QoE

Video Streaming Quality: Encoding, CDN, and Playback Video quality comes from three linked parts: encoding, delivery with a CDN, and playback on the viewer’s device. Each part affects startup time, smoothness, and how good the picture looks. Clear choices in encoding and delivery help users see a steady, crisp video. Encoding basics Codecs decide how much data a picture uses. Common options are H.264, HEVC, and AV1. Newer codecs save bandwidth but may need more decoding power on some devices. The encoding ladder splits video into multiple quality levels: low, medium, high. This lets the player pick a low bitrate when the network is slow and switch up when the connection improves. Aim for balanced resolutions (720p, 1080p, 4K) with realistic bitrates like 2–4 Mbps for 720p, 4–8 Mbps for 1080p, and 20–40 Mbps for 4K, depending on codec and framerate. Two practical knobs are keyframe interval and encoding presets. Shorter keyframes improve error resilience but raise data, while ABR-friendly presets reduce spikes. For some audiences, 2-pass encoding helps quality at the same average bitrate. ...

Video Streaming Technologies: Delivery and Quality Video streaming has become a staple of daily life, from movies to live sports. The core challenge is speed and quality: the video must arrive quickly and play smoothly on many networks and devices. This guide explains how delivery works and how teams measure and improve viewer experience worldwide. How delivery works Most streams use HTTP-based protocols that fetch small video pieces. The player downloads a manifest that lists different bitrates and chunk URLs. A CDN stores copies of the same video at multiple qualities and locations, so viewers near a cache edge get data fast. The player picks a bitrate based on current bandwidth and device performance, and can switch to a higher or lower quality without interrupting playback. ...

Video Streaming: Delivering High-Quality Content Worldwide Delivering high‑quality video to audiences around the world is a blend of technology and planning. Quality rests on three pillars: source encoding, the delivery network, and the viewer’s device. If one part falters, users notice long startup times, frequent buffering, or blurry images. The good news is that a thoughtful setup can handle many different networks and screens. Adaptive bitrate streaming plays a key role. It chops video into small chunks and changes the quality in real time as the connection improves or worsens. This keeps playback smoother for users on slow mobile data and busy Wi‑Fi alike. Two widely used formats are HLS and DASH. They work over HTTP and often share a common goal: deliver the best possible picture without long delays. ...