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