Convert XviD to WebM: Free Online Converter
Convert XviD MPEG-4 Video to WebM Video online for free. Fast, secure video conversion with no watermarks or registration.
XVIDに対応
アップロードすることで、これらのファイルの権利を有していること、および利用規約に同意することを確認したものとみなされます。
安全な転送
HTTPS暗号化アップロード
プライバシー優先
ゲストのファイルは約2時間で自動削除
登録不要
すぐに変換を開始
どこでも動作
あらゆるブラウザ、あらゆるデバイス
XviD から WebM への設定
- エンジン
- メディア
- 設定
- 設定は不要です。適切な初期値が使われます。
変換方法
アップロードエリアにドラッグするか、クリックして選択し、.xvidファイルをアップロードしてください。
必要に応じて出力設定を調整してください。デフォルト設定ではオリジナルの品質を維持します。
「変換」をクリックし、準備ができたら.webmファイルをダウンロードしてください。
XviDからWebMへの変換について
XviD is the open-source MPEG-4 Part 2 codec that emerged from the community's reverse-engineering of DivX: its name spelling DivX backwards as a philosophical statement. Scene release groups standardized on XviD for encoding DVD rips into the iconic 700 MB CD-rip format, creating the dominant video distribution standard of the peer-to-peer era. These AVI files with MPEG-4 ASP video and MP3 audio circulated across the internet before H.264 and modern streaming made them obsolete.
WebM is Google's open-source video container format, built on the Matroska container and using VP8, VP9, or AV1 video codecs with Opus or Vorbis audio. WebM is the native video format for YouTube, Chrome, Firefox, Edge, and the open web. Converting XviD to WebM transitions content from the first generation of open-source internet video to the current generation: from the scene release era to the streaming era.
XviDをWebMに変換する理由
WebM is the standard for royalty-free web video. Every major browser supports WebM natively, YouTube serves content in WebM, and Google's entire web video infrastructure is built on the VP8/VP9/AV1 codec family. XviD in AVI has no web playback capability — browsers cannot decode MPEG-4 Part 2 in AVI containers. WebM makes the content instantly playable via the HTML5 video element.
VP9 (WebM's primary codec) is dramatically more efficient than MPEG-4 Part 2. A typical XviD scene release at 800-1200 kbps can be matched in visual quality by VP9 at 400-700 kbps. This means your XviD collection can be converted to WebM at half the file size while maintaining equivalent visual quality — modern codec science has advanced enormously since the XviD era.
主な活用例
- Converting XviD scene releases for native playback in web browsers via HTML5 video
- Preparing XviD content for upload to platforms that prefer or require WebM (YouTube, web applications)
- Building a web-optimized video library from legacy XviD collections for streaming on personal websites
- Creating open-source web video assets from XviD sources for projects that avoid patent-encumbered codecs
- Reducing XviD file sizes by 40-60% through VP9 re-encoding while maintaining visual quality
仕組み
FFmpeg decodes the XviD MPEG-4 Part 2 video from the AVI container and re-encodes it using libvpx-vp9 (VP9) or libvpx (VP8). Audio is transcoded from MP3 to Opus (the modern standard for WebM audio) or Vorbis (for older browser compatibility). VP9 encoding uses constrained quality (CQ) mode with target bitrate for optimal rate-distortion performance. The WebM container (a Matroska subset) supports cues-at-front for efficient web seeking.
品質とパフォーマンス
VP9 significantly outperforms MPEG-4 Part 2 in compression efficiency. XviD scene releases at 800-1500 kbps can be matched in visual quality by VP9 at approximately 50-60% of the original bitrate. At matched file sizes, VP9 produces noticeably cleaner video with fewer blocking artifacts and better motion handling. AV1 pushes efficiency even further but encodes much more slowly. Opus audio at 128 kbps matches or exceeds the quality of the typical XviD scene release MP3 at 128-192 kbps.
デバイス互換性
| Device | XviD | WebM |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No | Native |
プラットフォーム別の推奨設定
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
最良の結果を得るためのヒント
- 1Use VP9 with CQ (constrained quality) mode at CRF 30-33 for web-quality video from XviD sources
- 2Choose Opus at 128 kbps for audio — it matches XviD scene release MP3 quality in a smaller, more efficient format
- 3Enable row-based multithreading for VP9 encoding to significantly reduce conversion time on multi-core systems
- 4Add WebM cues at the front of the file for instant seek capability in web browsers
- 5For very large XviD collections, VP8 encoding is 3-5x faster than VP9 with only a modest compression penalty
関連する変換
XviD to WebM conversion bridges two generations of open-source internet video — from the scene release era's community codec to Google's modern royalty-free streaming standard — with significantly better compression and native web playback.
XviDとWebMの比較
| 特徴 | XviD | WebM |
|---|---|---|
| 正式名称 | XviD MPEG-4 Video | WebM Video |
| 拡張子 | .xvid | .webm |