Agent skill

Ffmpeg Encoder Check 4855c0

Check available FFmpeg encoders before writing encoding scripts to avoid library version mismatches

Install Ffmpeg Encoder Check 4855c0

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0 --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .claude/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .claude/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0 --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .agents/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .agents/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0 --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .cursor/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .cursor/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/HKUDS/OpenSpace.git --path benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0 --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .gemini/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .gemini/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .github/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .github/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .github/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install HKUDS/OpenSpace ffmpeg-encoder-check-4855c0 --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/HKUDS/OpenSpace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 .opencode/skills/ffmpeg-encoder-check-4855c0 && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "ffmpeg-encoder-check-4855c0" agent skill from https://github.com/HKUDS/OpenSpace/tree/main/benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 into .opencode/skills/ffmpeg-encoder-check-4855c0/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ffmpeg-encoder-check-4855c0", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: ffmpeg-encoder-check-4855c0
GitHub stars: 7.8k
Token cost: ~615 tokens
SKILL.md length: 227 words
Files: 2
Skills in repo: 199
Repo updated: Aug 12, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Check available FFmpeg encoders before writing encoding scripts to avoid library version mismatches

Works in 3 steps: Probe Available Encoders → Choose Encoder Based on Availability → Verify Before Execution
Tasks that involve Video production
SKILL.md covers Purpose, Core Pattern, Example Decision Flow and When to Use Stream Copy, plus 1 more section
Calls ffmpeg

What it does

Ffmpeg Encoder Check 4855c0 is an agent skill from HKUDS/OpenSpace. Check available FFmpeg encoders before writing encoding scripts to avoid library version mismatches

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Media & Creative, covering Video production. It works with FFmpeg. The repository describes itself as: "OpenSpace: The Skill Management Layer for AI Agents" -- https://open-space.cloud/. The licence is MIT.

When your agent uses it

Tasks that involve Video production

Example prompts

“/ffmpeg-encoder-check-4855c0”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

Probe Available Encoders
Choose Encoder Based on Availability
Verify Before Execution

What it can do on your machine

Read from SKILL.md and the folder at commit 3827781. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- ffmpeg
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Ffmpeg Encoder Check 4855c0 loads about 615 tokens when it runs. Until then it costs about 32 tokens; SKILL.md has 227 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~32
When it runs · the whole SKILL.md, loaded when a task matches: ~615

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HKUDS/OpenSpace at commit 3827781, republished under its MIT licence (© HKUDS). 227 words, ~615 tokens.

Download SKILL.mdSave it as .claude/skills/ffmpeg-encoder-check-4855c0/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: ffmpeg-encoder-check-4855c0
description: Check available FFmpeg encoders before writing encoding scripts to avoid library version mismatches

FFmpeg Encoder Availability Check

Purpose

Before writing any FFmpeg encoding script, always probe the system for available encoders. This prevents failures from missing or incompatible codec libraries (especially libopenh264 which frequently has version mismatches).

Core Pattern

Step 1: Probe Available Encoders

Always run this command before deciding on encoding parameters:

bash

ffmpeg -encoders | grep h264

This shows which H.264 encoders are available on the system.

Step 2: Choose Encoder Based on Availability

Priority order for H.264 encoding:

-c:v copy - If source and target resolution/format match, copy the stream without re-encoding (fastest, no quality loss)
-c:v libx264 - If available, this is the most reliable and widely-compatible H.264 encoder
-c:v h264 - Hardware acceleration if available (varies by system)
Avoid libopenh264 - This encoder frequently has library version mismatches causing runtime failures

Step 3: Verify Before Execution

After choosing an encoder, verify it works with a short test:

bash

ffmpeg -t 5 -i input.mp4 -c:v libx264 -preset fast -crf 23 -c:a copy test_output.mp4

Example Decision Flow

bash

#!/bin/bash

# Check available encoders
ENCODERS=$(ffmpeg -encoders 2>/dev/null | grep h264)

if echo "$ENCODERS" | grep -q "libx264"; then
    VIDEO_CODEC="libx264"
    echo "Using libx264 encoder"
elif echo "$ENCODERS" | grep -q "h264"; then
    VIDEO_CODEC="h264"
    echo "Using h264 encoder"
else
    VIDEO_CODEC="copy"
    echo "No H.264 encoder available, using stream copy"
fi

# Use $VIDEO_CODEC in your ffmpeg command
ffmpeg -i input.mp4 -c:v $VIDEO_CODEC output.mp4

When to Use Stream Copy

Use -c:v copy when:

Source and target resolution are identical
Source codec is already H.264
You only need to change container format or audio
Speed is critical and re-encoding is unnecessary

Common Pitfalls

Don't assume encoder availability - Different systems have different FFmpeg builds
Don't hardcode libopenh264 - High failure rate due to library mismatches
Always test encoding - Run a short segment test before processing full files
Check both video and audio codecs - Audio encoder availability matters too

Files

SKILL.md and 1 other file in benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 of HKUDS/OpenSpace.

SKILL.md
.skill_id

Open the folder on GitHubat commit 3827781

Compare with similar skills

Ffmpeg Encoder Check 4855c0 next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Ffmpeg Encoder Check 4855c0 compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Ffmpeg Encoder Check 4855c0 this skillHKUDS/OpenSpace	7.8k	—	~615	Automated safety check: Pass	MIT	1 mo ago
Video Understandcalesthio/OpenMontage	66k	—	~841	Automated safety check: Pass	AGPL-3.0	6 days ago
HyperFrames Video Entry Pointheygen-com/hyperframes	59k	3 repos	~5.2k	Automated safety check: Pass	Apache-2.0	today
Video Shotseternityspring/reelbench-skills	872	1 repos	~1.8k	Automated safety check: Notes	Apache-2.0	18 days ago
Mobile Demo Film Editorsuperset-sh/superset	15k	—	~1.8k	Automated safety check: Pass	Custom licence	today
Video Editcalesthio/OpenMontage	66k	—	~855	Automated safety check: Notes	AGPL-3.0	6 days ago

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Questions about Ffmpeg Encoder Check 4855c0

What does Ffmpeg Encoder Check 4855c0 do?

Check available FFmpeg encoders before writing encoding scripts to avoid library version mismatches. Ffmpeg Encoder Check 4855c0 is an agent skill from HKUDS/OpenSpace.

When should I use Ffmpeg Encoder Check 4855c0?

Ffmpeg Encoder Check 4855c0 fits situations like: tasks that involve Video production.

How do I install Ffmpeg Encoder Check 4855c0 in Claude Code?

Run `npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a claude-code`. Or copy the skill folder (benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 in HKUDS/OpenSpace) into .claude/skills/ffmpeg-encoder-check-4855c0 in your project. Claude Code loads it when a task matches its description.

How do I install Ffmpeg Encoder Check 4855c0 in Codex?

Run `npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a codex`. Or copy the skill folder (benchmarks/gdpval/skills/ffmpeg-encoder-check-4855c0 in HKUDS/OpenSpace) into .agents/skills/ffmpeg-encoder-check-4855c0 in your project. Codex loads it when a task matches its description.

Can I use Ffmpeg Encoder Check 4855c0 in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HKUDS/OpenSpace --skill ffmpeg-encoder-check-4855c0 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ffmpeg-encoder-check-4855c0, .gemini/skills/ffmpeg-encoder-check-4855c0, .github/skills/ffmpeg-encoder-check-4855c0 and .opencode/skills/ffmpeg-encoder-check-4855c0 in your project.

What does Ffmpeg Encoder Check 4855c0 need to run?

Going by SKILL.md and its folder, Ffmpeg Encoder Check 4855c0 needs the command-line tools its instructions call (ffmpeg).

Does Ffmpeg Encoder Check 4855c0 access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Ffmpeg Encoder Check 4855c0 safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Ffmpeg Encoder Check 4855c0 use?

Ffmpeg Encoder Check 4855c0 is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Ffmpeg Encoder Check 4855c0 use?

About 615 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Ffmpeg Encoder Check 4855c0?

Skills that share tags, products or a category with Ffmpeg Encoder Check 4855c0: Video Understand (calesthio/OpenMontage, 66k stars), HyperFrames Video Entry Point (heygen-com/hyperframes, 59k stars), Video Shots (eternityspring/reelbench-skills, 872 stars) and Mobile Demo Film Editor (superset-sh/superset, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Ffmpeg Encoder Check 4855c0?

HKUDS (a GitHub organization) maintains it in HKUDS/OpenSpace, which has 7,750 GitHub stars. The repository holds 199 skills in this directory. The repository was last updated on August 12, 2026.

Source: HKUDS/OpenSpace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Ffmpeg Encoder Check 4855c0

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

FFmpeg Encoder Availability Check

Purpose

Core Pattern

Step 1: Probe Available Encoders

Step 2: Choose Encoder Based on Availability

Step 3: Verify Before Execution

Example Decision Flow

When to Use Stream Copy

Common Pitfalls

Files

Compare with similar skills

Similar skills

More from HKUDS/OpenSpace

Related

Questions about Ffmpeg Encoder Check 4855c0