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MKVToolNix 103 “The Darkness” MKV Manipulation Tool Brings New Features

Written By
MN
Marcus Nestor
Oct 29, 2026

MKVToolNix 103 comes about two months after MKVToolNix 101, which only updated a couple of dependencies, and one month after MKVToolNix 102, which only fixed a security issue. MKVToolNix 103 is a more hefty update introducing support for setting stereo mode from the frame packing arrangement SEI message in the video stream for AVC/H.264 and HEVC/H.265.
MN

Marcus Nestor

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