This meant passing two options for the second file: -D (don’t copy the video track) and -S (don’t copy the subtitle tracks). In this case I wanted to pull just the audio from the second file, and merge it with the first. (Why these weren’t simply encoded as multiple audio options on the same file is beyond me). The first file had the regular episode audio, and the second file had a filmmaker commentary. This scenario is a bit less common-I had a tv episode with two versions, each with the same video stream but different audio streams. Combining video/audio streams into one file # You feed in an output file name pattern using the -o option mkvmerge will append digits after the operation runs. Mkvmerge will split before each chapter stop you specify. To split the file apart, note the chapter stops where each episode begins, and you can feed those in to mkvmerge as a comma-delimited array: mkvmerge -o destination-file.mkv -split chapters:8,15,22,29 source-file.mkv This seems to come up sometimes with tv episodes, where multiple episodes are encoded as a single file. Here’s two scenarios: Splitting video files by chapter # It’s part of the MKVToolNix 1 collection of tools, and I found it helpful for splitting or combining different files (or specific audio/video streams from those files). That usually covers about 99% of my needs, but I recently had to tackle a couple of trickier situations, and this is where mkvmerge comes in. Typically I use software to create an mkv file and then use Don Melton’s handy CLI tools for video transcoding. I’m a firm believer in physical media but I also archive parts of my personal collection for local device streaming via Plex.
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