Media agent for Dash JS v4.1.0

What's new

This release introduces three new bitrate metrics providing comprehensive quality analysis for MPEG-DASH streaming, along with important improvements to existing bitrate calculations and dash.js v4/v5 compatibility.

New features

New bitrate metrics

• contentManifestBitrate: Maximum combined (video + audio) bitrate from the MPD manifest. Represents the highest possible stream variant available.

• contentMeasuredBitrate: Network estimated by the player's Adaptive BitRate (ABR) algorithm, based on measured download throughput. Use this metric to analyze ABR decision-making.

• contentDownloadBitrate: Effective download throughput calculated from video segment request data (bytesDownloaded × 8 / downloadTime). This Provides real-time network performance monitoring.

Changes

Updated bitrate calculations

• contentBitrate: Returns the video-only bitrate from the active track and excludes audio. Previous versions included combined bitrate.

• contentRenditionBitrate: Returns the combined video and audio bandwidth of the active rendition to provide a complete quality picture.

Compatibility improvements

• getDashBitrate(): Fixed v4 compatibility issue. Version check now occurs before calling v5-only APIs, preventing errors on dash.js v4.x installations.
• getManifestBitrate(): Introduced a smart version detection that uses getRepresentationsByType() on dash.js v5+ and falls back to getBitrateInfoListFor() on v4.x.

Bug fixes

• Removed duplicate getPlayhead() method definition
• Removed console.log statement from getTrack() error handler

Bitrate metrics overview