Download MKVToolnix 56.1.0

Moritz Bunkus has released an update for version 56 of MKVToolNix. With this open source program, matroska files can be viewed, edited and converted. For example, sound tracks and subtitles can be added, removed or set as default. MKVToolNix is ​​a collection of separate command line tools, but a graphical user interface is also included. Downloads are available for Windows, macOS, and various Linux distributions. This release aims to fix issues with hevc and h.265, among other things.

MKVToolNix v56.1.0 released

Unfortunately the release I’ve done only four days ago contains a nasty bug in the HEVC/H.265 code, and people are hitting it in droves. Therefore I’m releasing a fix for that.

New features and enhancements

• mkvmerge: AAC: added support for LOAS/LATM files with channel configuration indexes 9–21 (eg channel count 22.2 for index 13) according to Rec. ITU-R BS.1196-7 & ISO/IEC 23008-3:2019. Fixes #3081†

bug fixes

• mkvmerge: HEVC/H.265 parser: fixed invalid memory access that could happen when reading certain types of HEVC data (eg with changing parameter sets mid-stream) from certain containers (eg Matroska). This bug was introduced in release 56.0.0. Fixes #3083†
• mkvextract: AAC: mkvextract will now abort with an useful error message when the user tries to extract a track whose ‘audio-specific config’ element in CodecPrivate signals a number of channels of 7 or greater than 8 as that isn’t supported by the ADTS format.

Build system changes

• configure: the –enable-ubsan option hasn’t actually enabled anything since release 39.0.0.