If you have a bunch of MP4 files and want to convert to MKV without needing to reencode each file, this can be done with a super handy little tool called avconv.
Install avtools
You’ll need homebrew for this step.
Do the conversion
I have a folder of MP4 files. To bulk convert them:
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| for f in *.mp4; do avconv -i "$f" -codec copy -map 0 "${f%.mp4}.mkv"; done |
The above will create identically named MKVs next to your MP4s. Once you’re happy, just delete all your MP4s.
Bonus: Bulk merge ASS subtitles
If you have identically named ASS subtitle files next to your shiny new MKVs, you can bulk merge them using mkvmerge from mkvtoolnix with:
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| brew install mkvtoolnix
for f in *.mkv; do mkvmerge -o "./muxed/$f" "$f" "${f%.mkv}.ass"; done |
Thanks to user MestreLion for his answer on AskUbuntu.
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