add the old snippet md files

old_snippets/mass-mkv-to-mp4-ffmpeg.en.md

@@ -0,0 +1,14 @@
+---
+title: "convert .mkv to .mp4"
+date: 2020-06-30T16:31:35+02:00
+draft: false
+snippet_types: ["ffmpeg"]
+---
+
+Before I updated my [OBS](https://obsproject.com/) settings to record to .mp4
+files I manually converted .mkv files to .mp4. This shell command does that
+for every recording in a directory deleting the original.
+
+```shell
+$ for x in $(ls *.mkv | awk -F "." '{print $1}') ; do ffmpeg -i $x.mkv -c copy $x.mp4 && rm $x.mkv ; sleep 3; done
+```