AI product readNicoNico video downloader and NicoNico service enhancement tool
Enables users to save NicoNico (nicovideo.jp) videos as MP4 files locally, and enhances the NicoNico Dictionary browsing experience with pagination and bookmark features
1. User installs extension and configures initial settings (filename format, HLS mode) via options page. 2. User navigates to a NicoNico video page (sm#####). 3. Extension automatically injects a download button below the video title. 4. User clicks the download button; extension extracts the HLS master URL from the system message, downloads audio and video m3u8 streams, fetches TS segments, and uses ffmpeg.wasm to merge and convert them to MP4. 5. Browser saves the file via standard download dialog or auto-save. For NicoNico Dictionary: extension adds pagination controls and bookmark navigation on thread pages.
Adds a download button directly below the video title on NicoNico video pagesDownloads HLS streams (audio + video separately) and merges them into MP4 using ffmpeg.wasmSupports customizable default filename format for saved videosAdds 'next/previous 30 posts' pagination buttons on NicoNico Dictionary (dic.nicovideo.jp) thread pagesAdds a 'jump to last bookmarked post' feature on NicoNico Dictionary pagesMulti-language support (Japanese and English)
- Target users
- NicoNico (nicovideo.jp) users who want to download videos for offline viewing / NicoNico Dictionary (dic.nicovideo.jp) users who want improved browsing experience
- NicoNico premium membership is a destination-service feature; could not verify from source alone whether the extension works identically for free and premium NicoNico accounts
- Cannot confirm whether all NicoNico video types require login from extension source alone (some may be freely accessible)
MonetizationNo paid features detected
No evidence of any paid features, subscription, billing, or upgrade UI in the extension source code. No matches for keywords such as 'premium', 'subscription', 'payment', 'license', or 'account'. The extension is fully functional with only a 'storage' permission and no external service calls for billing. The keyword hits for 'pro' are all false positives in ffmpeg-core2.js (process, property, protocol, etc.). NicoNico itself has a premium membership, but the extension does not gate any of its own features behind it.
- Confidence
- 95
- Payment platform
- --
- Source
- AI / High
- Login required
- Yes
- Reason
- The extension runs as a content script on nicovideo.jp video pages and fetches HLS video streams using 'credentials: include' (func/ndl.js:626), relying on the user's existing NicoNico login session. NicoNico requires a logged-in account to access and play most videos, meaning the core download workflow depends on the user being authenticated on the destination service. The extension itself does not implement its own login UI or account system.
smの動画でも 保存するスイッチがでない動画があることに最近気がつきましたが なぜなんだろう? mp4以外の形式で上げられた動画なのでしょうか まあ十分お世話になってます
最初、初期設定の画面から動かなかったがホームに戻ったり、更新したり、違う動画を開いたりしたら出来るようになりました。この出会いに感謝
2024/12/2:12/1にアップロードされていた動画のダウンロードに使えました。
ダウンロードが完了した後、全く反応がなく、動画ファイルを見つけることができません。
まもなく保存完了から進まない
動画IDがsoから始まる公式チャンネル系の動画は保存できません それ以外はシンプルで使いやすいです。
不具合があったようですがまた使えるようになりました。 修正ありがとうございます。
It's not working anymore too!!! 😭
初期設定後に出るはずの右下の保存ボタンがでずに初期設定を行ってくださいという文言のままで使えません
「間もなく保存完了」から先に進みません。設定は問題なく出来ています。ご対応の程よろしくお願いいたします。