media-downloader: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Download videos and audio from 1500+ websites including YouTube, Bilibili, TikTok, Twitter/X, Instagram, Vimeo, and more using yt-dlp. Use when the user wants to download videos, save media from social platforms, download with specific resolution (720p/1080p/4K), get subtitles, or download entire playlists. Triggers on requests like 'download this video', 'save this YouTube video', 'download in 1080p', 'download with subtitles', 'download this playlist'.

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Media Downloader

Download video/audio from 1500+ websites using yt-dlp. Supports format selection, subtitles, playlists, and custom output naming.

Quick Start

# Basic download (best quality)
yt-dlp "URL"

# Specific resolution
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best[height<=1080]" "URL"

# With subtitles
yt-dlp --write-subs --sub-langs "en,zh" "URL"

# Audio only
yt-dlp -f "bestaudio" "URL"

Format Selection

Resolution Presets

Request	Command
Best quality	`-f "bestvideo+bestaudio/best"`
4K	`-f "bestvideo[height<=2160]+bestaudio/best"`
1080p	`-f "bestvideo[height<=1080]+bestaudio/best"`
720p	`-f "bestvideo[height<=720]+bestaudio/best"`
480p	`-f "bestvideo[height<=480]+bestaudio/best"`

List Available Formats

yt-dlp -F "URL"  # Show all formats with codes

Advanced Format Selection

# Prefer MP4 container
yt-dlp -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" "URL"

# Specific format code (from -F output)
yt-dlp -f 137+140 "URL"

# Merge to specific container
yt-dlp --merge-output-format mkv "URL"

Subtitles

Download Subtitles

# Manual subtitles (human-created)
yt-dlp --write-subs --sub-langs "en,zh,ja" "URL"

# Auto-generated subtitles
yt-dlp --write-auto-subs --sub-langs "en" "URL"

# Both manual and auto
yt-dlp --write-subs --write-auto-subs --sub-langs "en,zh" "URL"

# Embed subtitles in video (MP4/MKV/WebM)
yt-dlp --write-subs --embed-subs "URL"

List Available Subtitles

yt-dlp --list-subs "URL"

Subtitle Format

# Convert to SRT
yt-dlp --write-subs --sub-format srt "URL"

# Available: srt, ass, vtt, lrc

Output Naming

Template Variables

Variable	Description	Example
`%(title)s`	Video title	My Video
`%(id)s`	Video ID	dQw4w9WgXcQ
`%(ext)s`	File extension	mp4
`%(upload_date)s`	Upload date	20231215
`%(uploader)s`	Channel name	Rick Astley
`%(playlist)s`	Playlist name	Best Songs
`%(playlist_index)s`	Position in playlist	01
`%(resolution)s`	Video resolution	1920x1080

Common Patterns

# Default: title + extension
yt-dlp -o "%(title)s.%(ext)s" "URL"

# Date prefix
yt-dlp -o "%(upload_date)s - %(title)s.%(ext)s" "URL"

# Organized by uploader
yt-dlp -o "%(uploader)s/%(title)s.%(ext)s" "URL"

# Playlist with numbering
yt-dlp -o "%(playlist)s/%(playlist_index)02d - %(title)s.%(ext)s" "URL"

# Sanitize title (remove special chars)
yt-dlp -o "%(title).100B.%(ext)s" "URL"  # Limit to 100 bytes

Playlist Handling

# Download entire playlist
yt-dlp "PLAYLIST_URL"

# Only video (not playlist)
yt-dlp --no-playlist "URL"

# Specific items (1-indexed)
yt-dlp -I 1:5 "PLAYLIST_URL"        # First 5
yt-dlp -I 1,3,5 "PLAYLIST_URL"      # Items 1, 3, 5
yt-dlp -I -3: "PLAYLIST_URL"        # Last 3

# Skip already downloaded
yt-dlp --download-archive downloaded.txt "PLAYLIST_URL"

Platform-Specific Notes

YouTube

Supports: videos, playlists, channels, shorts, live streams
Cookies may be needed for age-restricted/member content

Bilibili

Use --cookies-from-browser for premium content
Subtitles: --write-subs --sub-langs "zh-Hans"

TikTok / Douyin

Direct URL download works
Watermark may be present in some cases

Twitter/X

Supports video tweets and spaces
Use --cookies-from-browser for private content

Instagram

Stories require login
Use --cookies-from-browser firefox or --cookies cookies.txt

Authentication

# Browser cookies (recommended)
yt-dlp --cookies-from-browser firefox "URL"
yt-dlp --cookies-from-browser chrome "URL"

# Cookie file
yt-dlp --cookies cookies.txt "URL"

# Username/password (limited support)
yt-dlp -u USERNAME -p PASSWORD "URL"

Troubleshooting

Common Issues

Issue	Solution
"Video unavailable"	Try `--cookies-from-browser`
Slow download	Add `--concurrent-fragments 4`
Format merge fails	Install ffmpeg
Geo-blocked	Use `--geo-bypass` or proxy

Update yt-dlp

yt-dlp -U  # Update to latest stable

Complete Examples

Download YouTube video in 1080p with Chinese subtitles:

yt-dlp -f "bestvideo[height<=1080]+bestaudio/best" \
       --write-subs --sub-langs "zh" \
       -o "%(title)s.%(ext)s" \
       "https://youtube.com/watch?v=..."

Download TikTok video:

yt-dlp -o "%(uploader)s - %(title)s.%(ext)s" \
       "https://tiktok.com/@user/video/..."

Download Bilibili playlist:

yt-dlp --cookies-from-browser chrome \
       -o "%(playlist)s/%(playlist_index)02d - %(title)s.%(ext)s" \
       "https://bilibili.com/video/BV..."

Download Twitter video:

yt-dlp --cookies-from-browser firefox \
       "https://twitter.com/user/status/..."

View source ↗

File metadata

name: media-downloader
description: Download videos and audio from 1500+ websites including YouTube, Bilibili, TikTok, Twitter/X, Instagram, Vimeo, and more using yt-dlp. Use when the user wants to download videos, save media from social platforms, download with specific resolution (720p/1080p/4K), get subtitles, or download entire playlists. Triggers on requests like 'download this video', 'save this YouTube video', 'download in 1080p', 'download with subtitles', 'download this playlist'.

View original text

---
name: media-downloader
description: Download videos and audio from 1500+ websites including YouTube, Bilibili, TikTok, Twitter/X, Instagram, Vimeo, and more using yt-dlp. Use when the user wants to download videos, save media from social platforms, download with specific resolution (720p/1080p/4K), get subtitles, or download entire playlists. Triggers on requests like 'download this video', 'save this YouTube video', 'download in 1080p', 'download with subtitles', 'download this playlist'.
---

# Media Downloader

Download video/audio from 1500+ websites using yt-dlp. Supports format selection, subtitles, playlists, and custom output naming.

## Quick Start

```bash
# Basic download (best quality)
yt-dlp "URL"

# Specific resolution
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best[height<=1080]" "URL"

# With subtitles
yt-dlp --write-subs --sub-langs "en,zh" "URL"

# Audio only
yt-dlp -f "bestaudio" "URL"
```

## Format Selection

### Resolution Presets

| Request | Command |
|---------|---------|
| Best quality | `-f "bestvideo+bestaudio/best"` |
| 4K | `-f "bestvideo[height<=2160]+bestaudio/best"` |
| 1080p | `-f "bestvideo[height<=1080]+bestaudio/best"` |
| 720p | `-f "bestvideo[height<=720]+bestaudio/best"` |
| 480p | `-f "bestvideo[height<=480]+bestaudio/best"` |

### List Available Formats

```bash
yt-dlp -F "URL"  # Show all formats with codes
```

### Advanced Format Selection

```bash
# Prefer MP4 container
yt-dlp -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" "URL"

# Specific format code (from -F output)
yt-dlp -f 137+140 "URL"

# Merge to specific container
yt-dlp --merge-output-format mkv "URL"
```

## Subtitles

### Download Subtitles

```bash
# Manual subtitles (human-created)
yt-dlp --write-subs --sub-langs "en,zh,ja" "URL"

# Auto-generated subtitles
yt-dlp --write-auto-subs --sub-langs "en" "URL"

# Both manual and auto
yt-dlp --write-subs --write-auto-subs --sub-langs "en,zh" "URL"

# Embed subtitles in video (MP4/MKV/WebM)
yt-dlp --write-subs --embed-subs "URL"
```

### List Available Subtitles

```bash
yt-dlp --list-subs "URL"
```

### Subtitle Format

```bash
# Convert to SRT
yt-dlp --write-subs --sub-format srt "URL"

# Available: srt, ass, vtt, lrc
```

## Output Naming

### Template Variables

| Variable | Description | Example |
|----------|-------------|---------|
| `%(title)s` | Video title | My Video |
| `%(id)s` | Video ID | dQw4w9WgXcQ |
| `%(ext)s` | File extension | mp4 |
| `%(upload_date)s` | Upload date | 20231215 |
| `%(uploader)s` | Channel name | Rick Astley |
| `%(playlist)s` | Playlist name | Best Songs |
| `%(playlist_index)s` | Position in playlist | 01 |
| `%(resolution)s` | Video resolution | 1920x1080 |

### Common Patterns

```bash
# Default: title + extension
yt-dlp -o "%(title)s.%(ext)s" "URL"

# Date prefix
yt-dlp -o "%(upload_date)s - %(title)s.%(ext)s" "URL"

# Organized by uploader
yt-dlp -o "%(uploader)s/%(title)s.%(ext)s" "URL"

# Playlist with numbering
yt-dlp -o "%(playlist)s/%(playlist_index)02d - %(title)s.%(ext)s" "URL"

# Sanitize title (remove special chars)
yt-dlp -o "%(title).100B.%(ext)s" "URL"  # Limit to 100 bytes
```

## Playlist Handling

```bash
# Download entire playlist
yt-dlp "PLAYLIST_URL"

# Only video (not playlist)
yt-dlp --no-playlist "URL"

# Specific items (1-indexed)
yt-dlp -I 1:5 "PLAYLIST_URL"        # First 5
yt-dlp -I 1,3,5 "PLAYLIST_URL"      # Items 1, 3, 5
yt-dlp -I -3: "PLAYLIST_URL"        # Last 3

# Skip already downloaded
yt-dlp --download-archive downloaded.txt "PLAYLIST_URL"
```

## Platform-Specific Notes

### YouTube
- Supports: videos, playlists, channels, shorts, live streams
- Cookies may be needed for age-restricted/member content

### Bilibili
- Use `--cookies-from-browser` for premium content
- Subtitles: `--write-subs --sub-langs "zh-Hans"`

### TikTok / Douyin
- Direct URL download works
- Watermark may be present in some cases

### Twitter/X
- Supports video tweets and spaces
- Use `--cookies-from-browser` for private content

### Instagram
- Stories require login
- Use `--cookies-from-browser firefox` or `--cookies cookies.txt`

## Authentication

```bash
# Browser cookies (recommended)
yt-dlp --cookies-from-browser firefox "URL"
yt-dlp --cookies-from-browser chrome "URL"

# Cookie file
yt-dlp --cookies cookies.txt "URL"

# Username/password (limited support)
yt-dlp -u USERNAME -p PASSWORD "URL"
```

## Troubleshooting

### Common Issues

| Issue | Solution |
|-------|----------|
| "Video unavailable" | Try `--cookies-from-browser` |
| Slow download | Add `--concurrent-fragments 4` |
| Format merge fails | Install ffmpeg |
| Geo-blocked | Use `--geo-bypass` or proxy |

### Update yt-dlp

```bash
yt-dlp -U  # Update to latest stable
```

## Complete Examples

**Download YouTube video in 1080p with Chinese subtitles:**
```bash
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best" \
       --write-subs --sub-langs "zh" \
       -o "%(title)s.%(ext)s" \
       "https://youtube.com/watch?v=..."
```

**Download TikTok video:**
```bash
yt-dlp -o "%(uploader)s - %(title)s.%(ext)s" \
       "https://tiktok.com/@user/video/..."
```

**Download Bilibili playlist:**
```bash
yt-dlp --cookies-from-browser chrome \
       -o "%(playlist)s/%(playlist_index)02d - %(title)s.%(ext)s" \
       "https://bilibili.com/video/BV..."
```

**Download Twitter video:**
```bash
yt-dlp --cookies-from-browser firefox \
       "https://twitter.com/user/status/..."
```

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
No explicit warning about legal use of downloaded content (copyright concerns).
The helper script lacks robust error handling (e.g., yt-dlp not installed, network errors).
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 300 stars, 17 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

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1Read the source. Confirm the input, expected output, dependencies and permissions.
2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
3

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: MemTensor/skills-vote
License: MIT
Version: 1.0.0
Last GitHub push: Aug 5, 2026
Registry updated: Sep 6, 2026
Instruction path: examples/recommend_skills/media-downloader/SKILL.md @ 55ea783d1818

Version reported in registry metadata; check source releases before relying on it.

Quality

66/100

Promising

Trust

56/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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      "install_command": "",
      "trust_score": 94,
      "audit_score": 95
    },
    {
      "slug": "yanliudesign-mono-color-skill",
      "name": "mono-color",
      "url": "https://www.openagentskill.com/skills/yanliudesign-mono-color-skill",
      "stars": 1919,
      "install_command": "npx skills add yanliudesign/mono-color-skill --skill mono-color",
      "trust_score": 85,
      "audit_score": 93
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "No explicit warning about legal use of downloaded content (copyright concerns).",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "The helper script lacks robust error handling (e.g., yt-dlp not installed, network errors)."
  ],
  "agent_contract": {
    "task_input": "Use media-downloader in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 64/100 Manual review",
      "Audit: 72/100 Needs review",
      "Safety: 28/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "memtensor-media-downloader (media-downloader)",
      "install_command": "npx skills add MemTensor/skills-vote --skill media-downloader",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "memtensor-media-downloader",
      "task": "Use media-downloader in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/memtensor-media-downloader",
    "api": "https://www.openagentskill.com/api/agent/skills/memtensor-media-downloader",
    "audit": "https://www.openagentskill.com/skills/memtensor-media-downloader/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=memtensor-media-downloader&task=Use%20media-downloader%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20media-downloader%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20media-downloader%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/memtensor-media-downloader/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/memtensor-media-downloader"
  }
}

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Creator: MemTensor
Source: MemTensor/skills-vote
Indexed by: OpenAgentSkill community index

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