### Download Small Size Images for Thumbnails

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Download small-sized JPG images using 'wget' for thumbnail previews. The 'image/original_small/' directory holds the URL lists for these images.

```bash
# 小サイズ画像をサムネイル確認用に取得する
mkdir -p downloads/image/small/D0002010
wget -P downloads/image/small/D0002010 -i image/original_small/D0002010.txt
```

--------------------------------

### Download All Audio URLs using Python

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

This Python script reads a list of audio URLs from a text file and downloads the first three audio files. Ensure the URL file exists in the 'audio/' directory and the output directory is created.

```python
import urllib.request, os, pathlib

series_id = "D0002011"
url_file = f"audio/{series_id}.txt"
out_dir = pathlib.Path(f"downloads/audio/{series_id}")
out_dir.mkdir(parents=True, exist_ok=True)

with open(url_file) as f:
    urls = [line.strip() for line in f if line.strip()]

for url in urls[:3]:  # 最初の3件のみ取得（例示）
    filename = url.split("/")[-1]
    dest = out_dir / filename
    print(f"ダウンロード中: {filename}")
    urllib.request.urlretrieve(url, dest)
    print(f"保存完了: {dest}")
```

--------------------------------

### List Available Audio Series IDs

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Use 'ls' to list the text files in the 'audio/' directory, which correspond to the available series IDs for audio materials.

```bash
# 利用可能な音声シリーズ一覧を確認する
ls audio/
# 出力例:
# D0002011.txt  D0002022.txt  D0002040.txt
# D0002070.txt  D0002100.txt  D0002110.txt
```

--------------------------------

### Download All Audio Series

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

A shell script to iterate through all '.txt' files in the 'audio/' directory, creating a subdirectory for each series ID and downloading the corresponding audio files using 'wget'.

```bash
# 全シリーズをまとめてダウンロードするシェルスクリプト例
for txt_file in audio/*.txt; do
  series_id=$(basename "$txt_file" .txt)
  mkdir -p "downloads/audio/$series_id"
  wget -q -P "downloads/audio/$series_id" -i "$txt_file"
  echo "完了: $series_id"
done
```

--------------------------------

### Download All Audio Files for a Series

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Download all M4A audio files for a given series ID using 'wget'. The 'audio/' directory contains text files listing URLs for different audio categories.

```bash
# D0002011 シリーズ（音楽素材）の音声ファイルを全件ダウンロードする
mkdir -p downloads/audio/D0002011
wget -P downloads/audio/D0002011 -i audio/D0002011.txt
```

--------------------------------

### Fetch First Movie Page Title

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Retrieve the HTML of the first video page URL listed in a 'movie/desc/' text file using 'curl' and extract the title using 'grep'.

```bash
# curl で最初の映像ページのHTMLを取得する例
first_url=$(head -1 movie/desc/D0002010.txt)
curl -s "$first_url" | grep -o '<title>[^<]*</title>'
```

--------------------------------

### Download All Videos for a Series

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Use 'wget' to download all MP4 video files for a specific series ID listed in a 'movie/original/' text file. Ensure the target directory exists.

```bash
# D0002010 シリーズの映像を全件ダウンロードする
mkdir -p downloads/movie/D0002010
wget -P downloads/movie/D0002010 -i movie/original/D0002010.txt
```

--------------------------------

### Understand Material ID Naming Pattern

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Examine the naming convention for material IDs, which includes the series ID, a sequential number, a sub-number (usually 00000), and a variant code (e.g., V for video, A for audio, S_00X for image size).

```bash
# 素材IDの命名パターンを確認する（例: D0002010003_00000_V_000.mp4）
# D0002010   = シリーズID
# 003        = 素材連番
# 00000      = サブ番号（通常 00000）
# V_000      = 映像バリアント（V=映像, A=音声, S_00X=画像サイズ）
```

--------------------------------

### Download Large Size Images (No Logo)

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Download all large-sized JPG images without logos for a specific series ID using 'wget'. The 'image/original_large/' directory contains the corresponding URL lists.

```bash
# D0002010 シリーズの大サイズ画像（ロゴなし）を全件ダウンロードする
mkdir -p downloads/image/large/D0002010
wget -P downloads/image/large/D0002010 -i image/original_large/D0002010.txt
```

--------------------------------

### List Movie Page URLs

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Use 'cat' to list all video detail page URLs for a given series ID from the 'movie/desc/' directory. Access these URLs in a browser to check content and licensing.

```bash
# D0002010 シリーズの映像ページURLを一覧表示する
cat movie/desc/D0002010.txt
```

```bash
# 出力例:
# https://www2.nhk.or.jp/archives/movies/?id=D0002010003_00000
# https://www2.nhk.or.jp/archives/movies/?id=D0002010004_00000
# https://www2.nhk.or.jp/archives/movies/?id=D0002010005_00000
# ...
```

--------------------------------

### Extract Archive.md Links from README

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Use 'grep' to extract all URLs pointing to 'archive.md' from the main 'README.md' file, which serves as an index for different categories.

```bash
# README.md から全 archive.md リンクを抽出する
grep -oP 'https://archive\.md/\S+' README.md

# 出力例:
# https://archive.md/9rAOs  （ほ乳類）
# https://archive.md/niU1P
# https://archive.md/Op7jR  （鳥類）
# ...
```

--------------------------------

### Download Single Large Image (No Logo)

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Fetch a single large-sized JPG image without a logo directly using 'curl' with the '-O' option.

```bash
# 単一画像をcurlで取得する例（大サイズ・ロゴなし）
curl -O https://www.nhk.or.jp/das/image/D0002010/D0002010003_00000_S_003.jpg
```

--------------------------------

### Parallel Download Videos with aria2c

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Utilize 'aria2c' for parallel downloading of video files, specifying the maximum number of connections and the input file containing URLs.

```bash
# aria2c で並列ダウンロード（最大4接続）する例
aria2c -x 4 -i movie/original/D0002010.txt --dir=downloads/movie/D0002010
```

--------------------------------

### Count URLs per Series ID

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Use 'wc -l' to count the number of URLs listed in the text files for different media types (audio, movie descriptions, image originals) grouped by series ID.

```bash
# シリーズID別のURL件数を確認する
wc -l audio/*.txt movie/desc/*.txt image/original_large/*.txt
```

--------------------------------

### Download Single Video File

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Fetch a single MP4 video file directly using 'curl' with the '-O' option to save it with its original filename.

```bash
# 単一URLを直接取得する例
curl -O https://www.nhk.or.jp/das/movie/D0002010/D0002010003_00000_V_000.mp4
```

--------------------------------

### Filter Archive.md Links by Category

Source: https://context7.com/ishizueitaro/nhkcreativelibrary/llms.txt

Employ 'awk' to filter and extract 'archive.md' links from 'README.md' that belong to a specific category, such as '生きもの' (Living things).

```bash
# 特定ジャンル（例: 生きもの）のリンクだけを抽出するスクリプト
awk '/## 生きもの/{found=1} /^## /{if(found && !/## 生きもの/) found=0} found && /archive\.md/' README.md
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.