Create, modify and inspect Matroska (MKV) files for Windows PC

MKVToolNix (64-bit)

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MKVToolNix 43.0.0 (64-bit)

  -  17.56 MB  -  Open Source
Free Download

Security Status

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of MKVToolNix 43.0.0 (64-bit).


For those interested in downloading the most recent release of MKVToolNix (64-bit) or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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Download MKVToolNix 43.0.0 (64-bit)

  • MKVToolNix 43.0.0 (64-bit) Screenshots

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What's new in this version:

New features and enhancements:
- MKVToolNix GUI: using one of the command line options `--info`, `--edit-headers` or `--edit-chapters` will make the GUI select the corresponding tool on startup even if no further file name is given. Implements #2723.
- MKVToolNix GUI: multiplexer: added a setting in the preferences for changing the location of the MediaInfo executable for when the user accidentally selected the wrong one.

Bug fixes:
- mkvmerge: AVC/h.264 parser: the order of the NALUs before each key frame was sometimes wrong: mkvmerge wrote SPS & PPS after SEI NALUs. Now SPS & PPS NALUs are always written before the other NALUs. Patch by Torsten Hauska. Part of the implementation of #2709 and part of the fix of #2250.
- mkvmerge: AVC/h.264 parser: when additional SPS or PPS NALUs (with IDs that haven't been seen so far) are found mid-stream, mkvmerge will prepend all following key frames with all current valid SPS & PPS NALUs (just like when SPS & PPS NALUs are overwritten mid-stream). Part of the fix of #2250.
- mkvmerge: MPEG TS reader: fixed detection of MPEG-1/2 video tracks consisting of very few frames. Fixes #2732
- mkvmerge: Ogg Opus reader: fixed the handling of Ogg Opus streams that contain a just one Ogg page (`mkvmerge` aborted with an exception). Fixes #2722
- MKVToolNix GUI: multiplexer: dragging & dropping XML files with chapters or tags to the GUI's window was broken in v42. Instead of adding the file names to the appropriate input boxes the GUI was running mkvmerge for file identification purposes which then failed. Fixes #2718.

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