melt-7 MCP Server
Enables agentic video editing and composition via MCP, allowing creation and manipulation of multi-track timelines with clips, transitions, filters, and text overlays, then rendering to MP4 using the melt-7 CLI.
README
melt-7 MCP Server
An MCP server exposing melt-7 (the MLT Multimedia Framework's CLI rendering engine -- the same backend Kdenlive uses) for agentic video editing/composition: build a multi-track timeline with clips, transitions, filters, and text overlays, then render it to MP4.
Requirements
melt-7andffprobe/ffmpegonPATH(Fedora:dnf install mlt)- Python 3.10+
pip install -r requirements.txt
Running
python mcp_server.py
Serves MCP over streamable HTTP on http://0.0.0.0:8001/mcp (port 8001, to
avoid colliding with the wan2_2_t2v server on 8000 if both run on the same host).
Project model
Each call to create_project creates a project directory under projects/<id>/
holding project.mlt (the authoritative MLT XML, hand-rolled to a flat schema
rather than Kdenlive's nested per-track-tractor convention), meta.json (display
name/profile bookkeeping), and a renders/ directory for rendered output. Every
tool re-reads project.mlt fresh and atomically rewrites it, so state survives
server restarts -- there is no in-memory project cache.
Tools
| Tool | Purpose |
|---|---|
create_project(name, profile) |
Start a new project at a given MLT profile (resolution/fps) |
list_projects() |
List all projects with track/clip counts |
get_project_xml(project_id) |
Raw MLT XML + human-readable summary |
delete_project(project_id) |
Delete a project and its renders |
probe_clip(file_path) |
ffprobe a media file (duration, resolution, fps, codecs) |
add_track(project_id, kind, position) |
Add a track to the timeline |
remove_track(project_id, track_id) |
Remove a track |
add_clip(project_id, track_id, source, clip_in, clip_out, position) |
Place a clip (file path or color:/noise: generator) |
trim_clip(project_id, track_id, clip_index, clip_in, clip_out) |
Change a clip's in/out points |
move_clip(project_id, track_id, clip_index, new_position, new_track_id) |
Move a clip (leaves a blank gap behind) |
remove_clip(project_id, track_id, clip_index) |
Remove a clip (leaves a blank gap) |
add_transition(project_id, track_a, track_b, service, properties) |
Composite/wipe/mix between two tracks |
add_filter(project_id, target, service, properties, clip_index) |
Attach a filter to a track, clip, or the whole project |
remove_filter(project_id, filter_id) |
Remove a filter |
add_text_overlay(project_id, track_id, text, ...) |
Convenience wrapper for a qtext title clip |
query_services(kind, service_id) |
Discover available producers/filters/transitions/consumers/profiles |
set_raw_xml_property / remove_raw_xml_property / inject_raw_xml |
Escape hatch for anything the above don't cover |
render_project(project_id, output_name, vcodec, acodec, extra_args, timeout_seconds) |
Render the timeline to MP4 (synchronous) |
Notes on reliability
melt-7's process exit code is not a reliable success signal -- it can
exit 0 while logging a "failed to load producer" error and silently
substituting a blank clip. render_project verifies success independently:
the output file must exist, be ffprobe-readable, have a duration close to
the project's expected duration, and stdout/stderr must contain no known
failure markers.
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