配合 Claude Code 工作流，哪个免费/开源视频剪辑方案最接近专业级输出？

I'm exploring automating video editing workflows using Claude Code to get closer to professional-level output without expensive software.

Specifics:

Target: scripted/structured content (tutorials, product demos, talks) — not motion graphics heavy
What I need: color grading, audio sync, subtitle generation, frame cuts, effects applied in batches
Current thinking: DaVinci Resolve (free tier) + FFmpeg CLI + Claude Code for automation layers

Actual questions I need answers for:

Best free editor for this use case? DaVinci Resolve, Kdenlive, or pure FFmpeg pipeline? What's the automation sweet spot?
What can Claude Code actually handle? (metadata editing, batch frame exports, audio extraction/sync, subtitle SRT generation, etc.) vs. what needs manual work?
Where's the hard floor? Color grading, effects, transitions — which ones are automatable via CLI, which ones require UI decisions that justify keeping a human in the loop?
Realistic gap? What does this stack genuinely NOT do compared to Premiere/FCP that would look noticeably amateur?

I'm not looking for generic "here are video editors" — I want the honest workflow limits so I know where Claude Code saves actual time vs. where it's just noise.