Mkvtoolnix 2020

30-04-2021
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I streamed a few DJ sets over the last few weeks with a bunch of friends as part of ‘covidcore’, an online get-together while we’re all in isolation. It’s been a while since I’ve played any DJ sets but it was great fun and thankfully I didn’t make too many mistakes.

Anyway, It was my first streaming experience and I found it a breeze to set up thanks to Twitch and OBS. When reviewing my recordings I noticed that my microphone level was pretty low so I decided to bust out the audio track from the video and raise it. Also when uploading my video to Youtube I also got a copyright notice about one the clips in my video which was subsequently being blocked, so I decided to edit that out too.

Here is how you can do it.

MKVToolNix is a set of tools to create, alter, split, join and inspect Matroska files (MKV). With these tools one can get information about (mkvinfo) Matroska files, extract tracks/data from (mkvextract) Matroska files and create (mkvmerge) Matroska files from other media files.

Note: I’m on a mac so all of the instructions are for that, but apart from installation the rest should be platform agnostic.

Steps

  • Install mkvtoolnix
  • Extract audio and video tracks from mkv file
  • Optionally convert audio track if editing needed
  • Merge audio and video tracks back in to mkv file

Apr 09, 2021 MKVToolNix is a small collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) that allows you to manipulate Matroska (MKV) files in several ways. You can use MKVToolNix to create, split, edit, mux, demux, merge, extract or inspect Matroska files. The purpose of this HowTo is to split videofiles which contain more than one episode of a tv show into single-episode files. So they show up individually within plex, can be played individually and don’t produce any of the weird things that multi-episode files are plagued with. The tool used is MKVtoolnixGUI it is freely available for all major PC operating systems. Therefore the container.

Install mkvtoolnix

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mkvtoolnix is a set of command line programs for finding out information and modifying mkv (“Matroska”) files. You can install it with a GUI but I didn’t bother.

That’s it, boom!

Extract audio and video tracks from mkv file

For this step we are going to run this command

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In the above command we are using mkvextract, part of mkvtoolnix, to extract the video track which is encoded using the ‘h264’ codec and also the audio track which is encoded using the AAC codec.

In order to find out what your video and audio tracks were encoded with use the following tool

Might be good to reference the docs if you have trouble there.

Optionally convert audio track if editing needed

My audio editor couldn’t open the aac file I created so I converted it to FLAC format using ffmpeg, another command line program that is insanely useful for converting audio formats (amongst other things).

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So to convert I ran

Now I can open my flac file and edit the parts I want, like amplifying my microphone in the recording.

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Merge audio and video tracks back in to mkv file

Right, now you have completed your editing we can stitch them back together again using the mkvmerge command

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You can see I just merged the flac formatted audio back in. Mac os download. I just tried it and it worked. I need to read up a bit more on file formats to be honest so if you need more info check the docs.

Torrent client for windows 10. Hope that helps someone :)

Hello dear people,

I sincerely hope you’re all healthy or at least on the way there. I’m fine, and having some more time on my hands I was able to get more done wrt. MKVToolNix. So this release is a bit bigger than the previous ones.

Nothing’s changed for package managers.

You can download the source code or one of the binaries. The Windows and macOS binaries as well as the Linux AppImage are available already. The other Linux binaries are stil being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

New features and enhancements

  • mkvmerge: mkvmerge has never supported appending & splitting FLAC audio
    tracks. mkvmerge will now emit error messages when the user attempts either
    instead of continuing and creating invalid FLAC tracks.
  • MKVToolNix GUI: added an option in the preferences to turn on eliding text
    on tab headers. If enabled, tab names will be shortened so that all tab
    headers fit into the window’s width. Implements #2768.
  • MKVToolNix GUI: added an option in the preferences to disable all tooltips.
  • MKVToolNix GUI: Windows: debug output sent via Qt’s to Windows’ debugging
    facility will use a more verbose message format including the application
    name, making it easier to filter for in SysInternal’s 'Debug View' utility.
  • MKVToolNix GUI: multiplexer: if the file identification fails due to a JSON
    parser error, the output generated by mkvmerge will be output via Qt’s
    debugging facility (viewable with SysInternal’s 'Debug View' utility on
    Windows; on other systems it’s output on STDERR) allowing insight into
    what’s gone wrong.
  • MKVToolNix GUI: multiplexer: if an error occurs during file identification,
    the name of the processed file will be mentioned in the error message.
  • MKVToolNix GUI: multiplexer: if an error occurs during identification of
    multiple files, the GUI will ask the user whether to continue or abort the
    identification process. Implements #2778.
  • MKVToolNix GUI: job queue: added an option in the preferences for removing
    completed jobs when exiting the program depending on their status.
    Implements #2769.

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Bug fixes

  • mkvmerge: H.265/HEVC packetizer: fixed changing the NALU size length, it was
    using the wrong offset into the hevcC structure.
  • mkvmerge: MP4 reader: fixed calculating the duration of video tracks that
    only contain a single frame. Fixes #2747.
  • mkvmerge: MP4 reader: if there’s no frame offset table (ctts atom) present
    for H.265/HEVC video tracks, mkvmerge will determine the timestamp order
    itself instead of relying on the timestamps in the MP4 being in the
    presentation order required by Matroska. Fixes #2777.
  • mkvpropedit: Windows: mkvpropedit wasn’t caching when reading the file to
    modify, slowing down operations such as adding track statistics tags
    considerably. Fixes #2761.
  • MKVToolNix GUI: multiplexer: when using the title as part of the destination
    file name (both automatically as well as using the 'copy title to
    destination file name' function) all characters that aren’t valid in a file
    name are replaced by hyphens.
  • MKVToolNix GUI: multiplexer: the 'copy title to destination file name'
    function was broken when the 'make file name unique' option in the
    preferences was disabled. In that case the file base name was removed
    regardless of what the title was set to at the time.
  • MKVToolNix GUI: multiplexer: when using the 'show command line' menu option
    on Windows the path to the mkvmerge executable was shown with forward
    slashes instead of backslashes. This is a purely cosmetic fix as Windows
    supports both forward and backward slashes.
  • MKVToolNix GUI: multiplexer: when adding Blu-ray playlists the GUI used to
    only look for the English version of the disc library information (title &
    cover images). Now the GUI will present all disc library entries in the
    'select playlist to add' dialog & let the user chose which one to use (if
    any). Fixes #2765.
  • MKVToolNix GUI: multiplexer, info tool: fixed the 'warn before overwriting'
    check wrt. jobs creating the same file. Fixes #2758.

So try to have some fun, especially in these trying times.