Markdown + pandoc + beamer, how to set the aspect ratio?

Question

I'm using the command pandoc -t beamer in.md -o out.pdf to generate slides from a markdown file. It seems the default aspect ratio is 4:3. How do I set it to 16:9?

Answer 1

Change the aspectratio variable in the YAML metadata at the beginning of the file:

---
title: 'My presentation'
author:
- Author One
- Author Two
...
aspectratio: 169
---

Check the man pages for more information.

Answer 2

You can specify the class option in the header of the .md file:

---
classoption: "aspectratio=169"
---

test