remotion-dev/remotion · error · Error

The config format has changed. Change `Config.Log.*()` calls

Error message

The config format has changed. Change `Config.Log.*()` calls to `Config.*()` in your config file.

What it means

`Config.Log` was the namespaced getter for log-level configuration in the old Remotion config layout. The flat `Config` object throws on access to force migration to `Config.setLogLevel(...)`.

Source

Thrown at packages/cli/src/config/index.ts:745

export const Config: FlatConfig = {
	get Bundling() {
		throw new Error(
			'The config format has changed. Change `Config.Bundling.*()` calls to `Config.*()` in your config file.',
		);
	},
	get Rendering() {
		throw new Error(
			'The config format has changed. Change `Config.Rendering.*()` calls to `Config.*()` in your config file.',
		);
	},
	get Output() {
		throw new Error(
			'The config format has changed. Change `Config.Output.*()` calls to `Config.*()` in your config file.',
		);
	},
	get Log() {
		throw new Error(
			'The config format has changed. Change `Config.Log.*()` calls to `Config.*()` in your config file.',
		);
	},
	get Preview() {
		throw new Error(
			'The config format has changed. Change `Config.Preview.*()` calls to `Config.*()` in your config file.',
		);
	},
	get Puppeteer() {
		throw new Error(
			'The config format has changed. Change `Config.Puppeteer.*()` calls to `Config.*()` in your config file.',
		);
	},
	setMaxTimelineTracks: StudioServerInternals.setMaxTimelineTracks,
	setKeyboardShortcutsEnabled: keyboardShortcutsOption.setConfig,
	setInteractivityEnabled: interactivityOption.setConfig,
	setAllowHtmlInCanvasEnabled,
	setRspack: rspackOption.setConfig,

View on GitHub (pinned to 78fe4bb3fd)

Solutions

Replace `Config.Log.setLevel(...)` with `Config.setLogLevel(...)`.
Use the migration guide to confirm the new flat setter names for any other `Log.*` calls.

Example fix

// before
Config.Log.setLevel('verbose');
// after
Config.setLogLevel('verbose');

Defensive patterns

Strategy: validation

Validate before calling

const src = readFileSync('remotion.config.ts', 'utf8');
if (/Config\.Log\./.test(src)) {
  throw new Error('Remove Config.Log.* calls; use Config.setLogLevel().');
}

Prevention

Search-and-replace the whole namespace group in one pass on upgrade.
Lock dependency versions in lockfile so a transitive major bump cannot surprise CI.

When it happens

Trigger: A config file calling `Config.Log.setLevel(...)` (or any `Config.Log.*`) under Remotion 4.x+/5.x.

Common situations: Un-migrated config after a major version upgrade; copied snippet from an outdated tutorial; CI failing immediately on first config load after a dependency bump.

Related errors

AI-assisted analysis of remotion-dev/remotion@78fe4bb3fd (2026-08-12). Data as JSON: /api/errors/07ca3ca63695dfca. Report an issue: GitHub.