@remotion/studio: Display held video frames in timeline

[JonnyBurger]

Summary

• display @remotion/media Video layers for their full visual duration when they hold the final frame
• clamp out-of-range timeline thumbnail requests to the final media instant
• add a reusable media timeline testbed covering duration, trimming, and playback rate

Testing

• bun run build
• bun run stylecheck

Closes #9387

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 22, 2026 9:08am
remotion	Ready	Preview, Comment	Jul 22, 2026 9:08am

[pullfrog]

✅ No new issues found.

Reviewed changes — extend the Studio timeline so @remotion/media Video layers render for their full sequence duration when they hold the final frame, and clamp out-of-range thumbnail extraction to the last valid media instant.

• Add isVideoWithLastFrameHold helper to detect @remotion/media Video sequences
• Return Infinity from useMaxMediaDuration for @remotion/media Video so the timeline no longer truncates at the decoded media duration
• Pass extendLastFrame through TimelineSequence into TimelineVideoInfo
• Add repeatLastFrame option to @remotion/timeline-utils extractFrames and clamp timestamps to the final media instant
• Add MediaTimelineTestbed composition and drums-drumsticks.mp4 sample asset

  ^{｜ View workflow run ｜ Using Kimi K2 (free via Pullfrog for OSS) (Claude Opus not used — the program covers this model; add its provider key to run your pick) ｜ 𝕏}