video-dev/hls.js

Features

• Adaptive Streaming Players - Provides a full-featured adaptive streaming player that automatically adjusts video quality based on network conditions.
• Media Source Extension Wrappers - Utilizes the browser Media Source Extensions API to feed media segments into a continuous playback stream.
• Adaptive Quality Adjustments - The library adjusts video quality levels automatically based on network bandwidth or manually using various transition modes.
• Media Buffer Managers - Manages the loading and clearing of media data buffers to optimize memory usage and stability.
• Low Latency Players - Optimizes segment loading and playback rates to minimize the delay between a live broadcast and the viewer.
• Chunked Transfer Processing - Appends media data to the buffer as it arrives via chunked transfer to reduce playback latency.
• HLS Streaming - Enables live and on-demand HLS video playback in web browsers using Media Source Extensions.
• DRM Integration - Enables playback of protected video content through integration with digital rights management systems.
• MSE Video Rendering - Feeds decoded video segments into the browser's Media Source Extensions for continuous playback.
• Adaptive Bitrate Controllers - Implements a controller that dynamically adjusts video quality levels based on network throughput and buffer levels.
• Stream Manifest Parsers - Parses HLS playlist files to map out media segments, subtitles, and timed metadata.
• Media Decryption - Coordinates with Encrypted Media Extensions to decrypt protected video segments on the client side.
• Digital Rights Management - Decrypts protected media content and manages licenses to play encrypted HLS video streams securely.
• Playback Health Metrics - Monitors frame drops and network performance to track the health and quality of the streaming session.
• Subtitle Rendering Layers - Renders visually styled subtitle and caption overlays using industry standards for accessibility.
• Playback Rendering - Implements synchronized caption and subtitle rendering for enhanced video accessibility.
• Precise Seeking - Enables navigation to specific timestamps in live or on-demand content without restriction to fragment boundaries.
• Buffer Eviction - Automatically removes used or distant media segments from the buffer to optimize memory usage.
• Chunked Transfer Processing - Appends partial media data to the playback buffer as it arrives to reduce latency for live streams.
• Media Track Management - Allows selecting and routing specific audio or subtitle tracks based on group identifiers.
• Timed Metadata Processing - Extracts and handles timed metadata such as ID3 tags and date-range elements within a stream.
• Custom Loaders - Provides a pluggable loader interface to replace default network requests with custom logic for P2P or testing.
• DRM License Management - Configures license server URLs and certificates to enable playback of encrypted media content.
• Error Handling - Manages network failures and parsing errors using automatic retries and emergency level switches.
• Error Recovery - Implements retry and emergency-switch mechanisms to restore playback after network or parsing failures.
• Network Request Loaders - Decouples network request logic from the player core to support custom P2P or mock implementations.
• Retry Strategies - Implements recovery actions and retries for failed segment requests to resolve network or media errors.
• Latency Reduction Modes - Adjusts segment loading and playback rates to minimize the delay between a live event and the viewer.
• Media and Audio - Implements an HTTP Live Streaming client.

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