| Metric | Definition | Target | |--------|------------|--------| | Time-to-first-frame (TTFF) | Load playlist + download 1st segment + decode | < 2 sec | | Rebuffering ratio | (Rebuffering duration) / (playback duration) | < 0.5% | | Bitrate switches | Number of quality changes per minute | < 3 | | Average bitrate | Weighted by segment duration | Maximize |
This simple implementation uses hls.js to handle HLS playback, checking for support and falling back to native handling. Conclusion
The player first downloads the Master Playlist. It parses the text-based m3u8 file to extract: hls-player
An HLS player is a software component designed to decode and play video delivered via the HTTP Live Streaming protocol. Developed by Apple in 2009, HLS has become the industry standard for video delivery, surpassing older technologies like Flash.
+------------------+ Fetches +--------------------+ | | --------------> | Master Playlist | (Resolution/Bitrate options) | | +--------------------+ | | Selects | Media Playlist | (Target quality level) | HLS Player | --------------> +--------------------+ | (Client Side) | | Video Segments | (.ts / .m4s media chunks) | | +--------------------+ | | Decodes +--------------------+ | | --------------> | Continuous Display | (Seamless playback) +------------------+ +--------------------+ 1. Fetching the Index Files (Playlists) Developed by Apple in 2009, HLS has become
The manifest file describes different available quality levels (bitrates). The HLS player analyzes the user's current network speed and selects the best quality segment to download.
One of HLS's greatest strengths is its near-universal compatibility. Most modern browsers support HLS playback, though the underlying implementation differs: The HLS player analyzes the user's current network
Maintained by Google, this open-source library excels at playing M3U8 streams with advanced DRM requirements on web browsers.
A popular open-source HTML5 video player framework. While it supports many formats, it has excellent HLS support through plugins, making it a "plug-and-play" favorite for many. 3. ExoPlayer (Android)
If you are building an application, you don't need to write the decoding logic from scratch. Common choices include: