[Feature Request] Add Video Merge / Concatenate Support

[mohammed-danyal]

Overview

Reframe currently supports editing individual videos, but there is no way to combine multiple clips into a single exported video.

Adding a simple video merge feature would allow users to stitch clips together directly in the browser using the existing FFmpeg/WASM pipeline.

Current Behavior

• Only single video workflows are supported
• Multiple videos cannot be merged/exported together
• No UI exists for arranging clips before processing

Expected Behavior

• Users can upload multiple videos
• Clips are displayed in order
• Users can rearrange clips before merging
• Videos are exported as a single merged file

Acceptance Criteria

• Support multiple video uploads
• Display clips in sequence
• Allow clip reordering
• Export merged video
• Processing remains fully client-side
• Existing workflows remain unaffected

I am a GSSoC 2026 contributor and would love to work on this issue. Could you please assign it to me?

[github-actions]

👋 Thanks for opening an issue, @mohammed-danyal!

Our maintainers will review this shortly 🚀

Before you start working

• 📖 Read the CONTRIBUTING.md guide
• 💬 Wait for a maintainer to assign you the issue before starting work
• 🔍 Search for existing issues to avoid duplicates

For GSSoC'26 contributors

If you're contributing under GirlScript Summer of Code 2026, please mention it in your comment when requesting assignment:

"I'd like to work on this — contributing under GSSoC'26"

Architecture notes

Reframe is a static Next.js app with output: "export". Key points:

• All video processing uses FFmpeg.wasm (client-side, no server)
• headers() in next.config.ts won't work — use vercel.json instead
• not-found.tsx requires public/404.html + vercel.json routes config

Happy contributing! ⭐ Star the repo if you find it useful!

[chavanGaneshDatta]

I’m a GSSoC’26 contributor and would love to work on this feature request. The idea of adding client-side video merge/concatenate support using the existing FFmpeg.wasm pipeline sounds really interesting.

I’d like to work on this issue. Could you please assign it to me?

[magic-peach]

Thanks for the feature request, @mohammed-danyal! Video merge/concatenation is a popular ask and a good candidate for a future feature.

Key implementation notes for anyone wanting to work on this:

• FFmpeg.wasm supports concatenation via the concat demuxer
• The UI would need a multi-file input and ordering controls
• This is level:advanced scope — significant additions to VideoEditor.tsx, useVideoEditor.ts, and ffmpeg.ts

If you'd like to work on this, please comment "I'd like to work on this" and we'll assign it to you.

[magic-peach]

Assigning to @chavanGaneshDatta who was first to request this. Good luck with the implementation! 🎉

[github-actions]

Claude encountered an error —— View job

---

Issue Triage & Labeling

Following CLAUDE.md rules for automatic issue triage:

Todo List:

• Check current issue labels
• Apply required labels per CLAUDE.md rules
• Confirm issue assignment status
• Post acknowledgment if needed

---

[github-actions]

Claude encountered an error —— View job

---

No action needed - this was just an assignment notification from the maintainer. The issue has been properly assigned to @chavanGaneshDatta.

---

Job run