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old_snippets/ffmpeg-screen-casts.en.md

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+---
+title: "uploadable ffmpeg screen casts"
+date: 2020-01-11T12:33:07+01:00
+draft: false
+snippet_types: ["ffmpeg", "media"]
+---
+
+I prefer tools like https://asciinema.org/ when I want to show terminal tricks and cli tools I
+build, but sometimes you need to show something that breaks out of the terminal. In this case I
+record a **.mov** screen cast using quicktime then do several transformations using **ffmpeg** to
+get a small uploaded web friendly **.webm** file.
+
+1. cut down the video if need be
+```shell
+$ ffmpeg -i movie.mp4 -ss 00:00:03 -t 00:00:08 -async 1 cut.mp4
+```
+
+2. scale down the **.mov** file to something more web friendly
+```shell
+$ ffmpeg -i vim_dic.mov -filter:v scale=512:-1 -c:a copy vim_dic_small.mov
+```
+
+3. convert the **.mov** to **.webm**
+```shell
+$ ffmpeg -i vim_dic_small.mov -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis vim_dic.webm
+```
+
+If you don't have **ffmpeg** is available via brew
+
+source:
+
+- [brew ffmpeg](https://formulae.brew.sh/formula/ffmpeg)
+- [convert mov to webm](https://davidwalsh.name/convert-to-webm)
+- [resize mov](https://superuser.com/questions/624563/how-to-resize-a-video-to-make-it-smaller-with-ffmpeg)
+- [html video element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video)
+- [cutting video](https://stackoverflow.com/questions/18444194/cutting-the-videos-based-on-start-and-end-time-using-ffmpeg)