# Have lots of MP4 files to convert to mkv and remove all audio tracks except one and all subtitles

**URL:** <https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579>\
**Category:** Help\
**Created:** [June 30, 2026, 11:11pm UTC](https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579 "2026-06-30T23:11:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![JAK1962](https://help.mkvtoolnix.download/letter_avatar_proxy/v4/letter/j/8e7dd6/32.png) [@JAK1962](https://help.mkvtoolnix.download/u/JAK1962)\
**Post date:** [June 30, 2026, 11:11pm UTC](https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579/1 "2026-06-30T23:11:33Z")

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Have lots of MP4 files to convert to mkv and remove all audio tracks except one and all subtitles

However when I add multiple MP4 files there are a lot of tuck boxes, I had hoped as all the mp4s had the same audio subtitles tracks I could set them the same for all the mp4s, also even if I add as a queue, it only converts the first one, several times it seems overwriting the previous one, what am I doing wrong

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**Author:** ![mbunkus](https://help.mkvtoolnix.download/user_avatar/help.mkvtoolnix.download/mbunkus/32/11_2.png) [@mbunkus](https://help.mkvtoolnix.download/u/mbunkus)\
**Post date:** [July 1, 2026, 6:56am UTC](https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579/2 "2026-07-01T06:56:34Z")

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See the following FAQ entries:

> **[Batch muxing with the GUI](https://codeberg.org/mbunkus/mkvtoolnix/wiki/Batch-muxing-with-the-GUI)**
>
> Creating and working with Matroska files

> **[Automation examples](https://codeberg.org/mbunkus/mkvtoolnix/wiki/Automation-examples)**
>
> Creating and working with Matroska files

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**Author:** ![SamA89](https://help.mkvtoolnix.download/letter_avatar_proxy/v4/letter/s/49beb7/32.png) [@SamA89](https://help.mkvtoolnix.download/u/SamA89)\
**Post date:** [July 1, 2026, 6:25pm UTC](https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579/3 "2026-07-01T18:25:32Z")

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Hi JAK, I hope you’re doing great.

I’d love to help. Can you please tell me which audio track ID you want to keep?  
And please confirm whether you want to remove all the subtitle tracks.

If you want to keep all the subtitle tracks instead, we can do that, but please note that not all subtitle formats in MP4 are supported by MKV (most are though).

Also, please mention the path to your mkvmerge.exe (example: D:\MKVToolNix 99.0 x64\mkvmerge.exe)

Let me know so I can customize my batch script for you.

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**Author:** ![devtimi](https://help.mkvtoolnix.download/user_avatar/help.mkvtoolnix.download/devtimi/32/378_2.png) [@devtimi](https://help.mkvtoolnix.download/u/devtimi)\
**Post date:** [July 6, 2026, 4:19pm UTC](https://help.mkvtoolnix.download/t/have-lots-of-mp4-files-to-convert-to-mkv-and-remove-all-audio-tracks-except-one-and-all-subtitles/1579/4 "2026-07-06T16:19:47Z")

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Hah! I had no idea you could batch with the UI. I put mkvtoolnix on `$PATH` and just ask AI to write scripts. Works extremely well and I don’t have to be very specific.