Currently the codec (any many other options) are determined by a few factors:

1. Specified in the render dialog in the Remotion Studio?
2. Specified as a CLI flag?
3. Passed explicitly to renderMedia()?
4. Specified in the config file?
5. Fallback: Default codec

The idea is to add another way that allows per-default configuration, starting with codec

<Composition calculateMetadata={() => {
	return {defaultCodec: "vp8"}
}}/>

This will have a higher priority than the config file, but less priority than explicitly passing the option to renderMedia().

The VideoConfig type should be expanded with a defaultConfig field:

This is a good first step and TypeScript should reveal the places where you need to implement additional functionality

Acceptance criteria

• Make the composition get rendered with this codec if nothing with higher priority was specified.
• In the Remotion Studio, when rendering, the codec should be preselected in the modal but overridden.
• Logs should also tell when this was used for resolution (extend this here)
• Add it to the calculateMetadata() docs

Bounty

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• Write documentation: https://www.remotion.dev/docs/contributing/docs

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/bounty 200