@remotion/renderer: Rename mimeType to contentType

[JonnyBurger]

Summary

• Renames mimeType to contentType in the return values of renderMedia() and renderStill()
• Updates tests and docs accordingly

Test plan

• Existing contentType assertions pass in render-media and render-still tests

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Feb 20, 2026 10:44am
remotion	Ready	Preview, Comment	Feb 20, 2026 10:44am

[pullfrog]

Clean rename from mimeType to contentType in the return values of renderMedia() and renderStill(). Since this field was introduced in v4.0.426 (not yet released — current version is 4.0.425), there is no backward compatibility concern. All references in source, tests, and docs are updated consistently. No issues found.

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[pullfrog]

Clean rename. Since the mimeType field was introduced at v4.0.426 (unreleased — current version is 4.0.425), there are no backward compatibility concerns. All references in the renderer package, tests, and docs are updated consistently. The remaining mimeType usages in the codebase (media-parser, template-recorder, convert, devtools-types, asset downloading) are unrelated to the renderMedia/renderStill return types and don't need changes. LGTM.

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[Copilot]

Pull request overview

This pull request renames the mimeType property to contentType in the return values of renderMedia() and renderStill() functions in the @remotion/renderer package. This is a breaking API change that aligns the property name with standard HTTP terminology, as these values represent content types like 'image/png' and 'video/mp4'.

Changes:

• Renamed mimeType to contentType in return types and implementations for both renderMedia() and renderStill()
• Updated all test assertions to use the new contentType property name
• Updated API documentation to reflect the new property name

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/renderer/src/render-still.ts	Updated type definition and return object to use contentType instead of mimeType
packages/renderer/src/render-media.ts	Updated type definition and return object to use contentType instead of mimeType
packages/renderer/src/test/render-still.test.ts	Updated test to destructure and assert contentType instead of mimeType
packages/it-tests/src/ssr/render-media.test.ts	Updated test to destructure and assert contentType instead of mimeType
packages/docs/docs/renderer/render-still.mdx	Updated documentation to describe contentType property
packages/docs/docs/renderer/render-media.mdx	Updated documentation to describe contentType property