Media Mkvtoolnix

Context: $ARGUMENTS

MKVToolNix authors Matroska natively. Four tools: mkvmerge (mux/split), mkvextract (demux), mkvpropedit (in-place metadata edit), mkvinfo (inspect). Never re-encodes — stream-copy only. For re-encoding use ffmpeg; for MKV → MP4 use ffmpeg (MKVToolNix cannot write MP4).

Quick start

• Merge tracks into one MKV: → Step 3 (merge recipe)
• Split by time / size: → Step 3 (split recipe)
• Extract a track (audio/subs/attachment): → Step 3 (extract recipe)
• Edit language / default flag in place: → Step 3 (propedit recipe)
• Inspect / verify: → Step 4

When to use