Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add MCKRUZ/ComfyUI-Expert --skill video-assemblygit clone --depth 1 https://github.com/MCKRUZ/ComfyUI-ExpertWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mckruz/comfyui-expert/video-assembly)<a href="https://agentmods.dev/skills/mckruz/comfyui-expert/video-assembly"><img src="https://agentmods.dev/badge/skills/mckruz/comfyui-expert/video-assembly/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mckruz/comfyui-expert/video-assembly"><img src="https://agentmods.dev/badge/skills/mckruz/comfyui-expert/video-assembly.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00049 | $0.01794 |
| Opus 5 | $0.00024 | $0.00897 |
| Sonnet 5 | $0.00010 | $0.00359 |
| Haiku 4.5 | $0.00005 | $0.00179 |
Grade A, and why
video-assembly scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Video Assembly
Combines outputs from video and voice pipelines into final deliverable videos.
Two Assembly Modes
Mode 1: FFmpeg (Simple, Fast)
Best for: Concatenation, audio mixing, basic transitions, format conversion.
No dependencies beyond FFmpeg (pre-installed on most systems).
Mode 2: Remotion (Complex Compositions)
Best for: Animated captions, data visualizations, complex motion graphics, React-based templates.
Uses existing remotion-best-practices skill for guidance.
FFmpeg Operations
Concatenate Video Clips
# Create file list
echo "file 'clip1.mp4'" > filelist.txt
echo "file 'clip2.mp4'" >> filelist.txt
echo "file 'clip3.mp4'" >> filelist.txt
# Concatenate (same codec/resolution)
ffmpeg -f concat -safe 0 -i filelist.txt -c copy output.mp4
# Concatenate (different codecs/resolutions - re-encode)
ffmpeg -f concat -safe 0 -i filelist.txt -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" -c:v libx264 -crf 19 output.mp4
Add Audio to Video
# Replace audio
ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4
# Mix audio (keep original + add music)
ffmpeg -i video.mp4 -i music.mp3 -filter_complex "[0:a][1:a]amix=inputs=2:duration=first:dropout_transition=3" -c:v copy output.mp4
# Add audio with volume control
ffmpeg -i video.mp4 -i bgm.mp3 -filter_complex "[1:a]volume=0.3[bg];[0:a][bg]amix=inputs=2:duration=first" -c:v copy output.mp4
Add Subtitles
# Burn subtitles (SRT file)
ffmpeg -i video.mp4 -vf "subtitles=subs.srt:force_style='FontName=Arial,FontSize=24,PrimaryColour=&HFFFFFF,OutlineColour=&H000000,Outline=2'" -c:a copy output.mp4
# Burn subtitles (ASS file for styled)
ffmpeg -i video.mp4 -vf "ass=subs.ass" -c:a copy output.mp4
Transitions Between Clips
# Crossfade (2 second transition)
ffmpeg -i clip1.mp4 -i clip2.mp4 -filter_complex \
"[0:v]trim=0:5,setpts=PTS-STARTPTS[v0]; \
[1:v]trim=0:5,setpts=PTS-STARTPTS[v1]; \
[v0][v1]xfade=transition=fade:duration=2:offset=3[outv]" \
-map "[outv]" output.mp4
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 195 lines · 49 tokens per session scan A 7e427b58baa3
video-assembly is a skill published in the GitHub repository MCKRUZ/ComfyUI-Expert (91 stars, last pushed 5mo ago), licensed MIT. It adds 49 tokens to every session and 1,794 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
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A directing workflow for producing AI short films with local or cloud-based models, including atmospheric films, trailers, vlogs, and dialogue-driven stories. It covers creative decisions, avoiding repetitive results, production steps, and final editing.
rhythm-density
A video-editing guide for arranging several short locally generated shots so their pacing alternates between quick, dense sections and slower breathing space.