Dash-Industry-Forum/dash.js
Dash.js
dash.js is a browser-based JavaScript player for streaming adaptive video and audio content using the MPEG-DASH standard. It functions as an adaptive bitrate streaming client that adjusts media quality in real time based on network conditions and buffer levels.
The project includes a playback engine capable of decrypting protected content through digital rights management systems and a specialized player for reducing latency in live broadcast events. It also serves as a playback metrics engine for monitoring and reporting real-time quality-of-experience data.
The software covers a broad range of capabilities including multi-language audio and text track switching, live stream latency control, and video playback analytics. It manages the authorization of encrypted media streams and the automatic selection of video bitrates to prevent interruptions.
Features
- Media Content Streaming - Implements the streaming delivery mechanism for playing MPEG-DASH adaptive content in web browsers.
- Adaptive Bitrate Streaming - Functions as a client-side implementation that automatically adjusts media quality based on network conditions and buffer levels.
- Playback Quality Monitors - Provides real-time monitoring of playback performance, including buffer levels and bitrate, to track quality of experience.
- Live Stream Controls - Allows adjusting the delay between the live edge and playback point to synchronize with a broadcast.
- Low-Latency Live Stream Players - Delivers low-latency live streams with seamless resolution switching for real-time viewing.
- Adaptive Bitrate Playback - Dynamically adjusts video quality based on network speed and buffer levels to prevent playback interruptions.
- Low-Latency Playback - Provides client-side rendering of live streams with minimal end-to-end delay for real-time content delivery.
- Media Buffer Managers - Manages the browser playback buffer by feeding fragmented media segments into the Media Source Extensions API.
- DRM-Protected Adaptive Streaming - Provides adaptive bitrate streaming combined with integrated decryption for protected content.
- Bitrate Selection Logic - Implements logic to analyze available stream formats and select the optimal bitrate based on network throughput.
- DASH Streaming Players - Provides playback of video content encoded in the MPEG-DASH format for adaptive bitrate streaming.
- Live Streaming Players - Offers a specialized player focused on reducing latency and synchronizing playback for live broadcast events.
- DRM-Enabled Players - Includes a playback engine capable of decrypting protected content through digital rights management systems.
- DRM Integration - Integrates with decryption systems via Encrypted Media Extensions to play protected media content.
- Digital Rights Management - Manages media licenses and decrypts protected content through integration with DRM systems.
- Media Decryption - Reverses cryptographic protection on media streams using DRM keys to allow playback.
- Quality of Experience Reporting - Serves as a playback metrics engine for monitoring and reporting real-time quality-of-experience and buffer performance data.
- Quality of Experience Reporters - Sends standardized playback metrics and quality-of-experience data back to a server.
- State Machines - Coordinates track selection and segment request timing using a state machine driven by XML media presentation descriptions.
- Media Track Management - Provides utilities for configuring initial languages, roles, and accessibility schemes for media tracks.
- Media Track Selectors - Provides interfaces for switching between different audio and subtitle tracks during playback.
- Segmented Request Pipelines - Fetches fragmented media files via HTTP ranges to enable seamless switching between quality levels.
- Audio and Text Track Switching - Implements the ability to switch between multiple language audio tracks and text captions for a single media stream.
- Playback Monitoring - Tracks and reports real-time performance data including buffer levels, bitrate, and dropped frames.
- Media Event Listeners - Uses media event listeners to track playback performance and quality of experience data.
