v2.5.0

Version 2.5.0

Index Format Update

The index file format has been updated to version 3 to support the maxFragmentDuration() method and precise HLS #EXT-X-TARGETDURATION calculation. Existing version 2 index files must be regenerated.

HLS and Fragmenting

• Soft threshold: Introduced a soft threshold (10% tolerance) when cutting video fragments to hit target chunk sizes more accurately and prevent overshoots.
• Audio-only: Added support for audio-only streams (setting PCR timestamps, disabling segment merging for playback stability).
• Precision & Offsets: Eliminated timestamp drift by using the source stream timescale and added support for negative sample offsets (ctts atom).

Codec Parsing and Logic

• Robust parsing: H.264 (AVCC) and H.265 (HVCC) parsing logic has been refactored: it is now stateless and includes strict buffer bounds and configuration version checks.
• HEVC Open GOP fix: Added a fix for initial HEVC frames (patching CRA to BLA) to eliminate visual artifacts at chunk boundaries.

Performance Optimizations

• FragmentReader: Optimized I/O and reduced garbage collection (GC) pressure by introducing a coalesced read strategy and removing intermediate arrays.
• HLS Packetizer: Removed unnecessary data copying and optimized the sample counter to work with different PIDs.
• FragmentListBuilder: Improved performance by deriving duration directly from sample data and fixing truncation errors for the last fragment.

v2.4.1

Version 2.4.1

Fix H.265 codec:

• Correct bytes order for compatibility flags.
• Correctly extract profile_space and profile_idc.
• Optimize general constraint indicator flags parsing.

v2.4.0

Version 2.4.0

HLS Packetizer

• Use correct implementation of CRC-32/MPEG-2 algorithm.
• Support more than 6.5 hours of video length.
• Add 100ms time shift between DTS and PCR.

Other

• Use v10 as a minimum node version.

v2.3.1

Version 2.3.1

• Fix infinite loop issue in the parse method
• Truncate floating numbers in elst atoms

v2.3.0

Version 2.3.0

Basic implementation of empty edits

Add an ability to support empty edits at the beginning of audio and video tracks. If a track is started with a delay, it's reflected in the edts and elst atoms. This is a basic implementation of these atoms support in MP4 parser and builder classes.

MDHD atom improvement

• Take into account version 1 in the build method.
• Cover this atom with unit tests.

v2.2.3

Version 2.2.3

Fix a bug in the MP4 Builder

HDLR atom:

• Use the correct atom size
• Use the correct position for the component name
• Correctly parse the component name

FTYP atom:

• Set minor version to 0x200

Video sample atom:

• Get rid of the useless encoder name

Clean dev dependencies

Replace unnecessary dev dependencies with self-written code:

• tempy
• lodash
• faker

Improvements

• Replace deprecated Buffer.slice by Buffer.subarray
• Require all atom classes statically instead of require them dynamically

v2.2.2

Version 2.2.2

Fix bugs in FLV and MP4 parsers:

• Ignore tags that cannot be read due to unexpected file ending
• Ignore tracks that don't have proper codec information

v2.2.1

Version 2.2.1

Update dependencies

v2.2.0

Version 2.2.0

MP4: Basic implementation of the MP4 builder

v2.1.12

Version 2.1.12

HLS: Don't split video sample into chunks