Convert WMV to OGV: Free Online Converter
Convert Windows Media Video to Ogg Video online for free. Fast, secure video conversion with no watermarks or registration.
WMV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。
変換設定: ファイルを追加すると調整できます
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
WMV から OGV への設定
- エンジン
- メディア
- 設定
- 調整できる設定: 22
- Trim Start
- Trim End
- Volume
- Audio Fade In
- Audio Fade Out
- Quality
- Resolution
- Frame Rate
- Resize Mode
- Audio Channels
- Crop X
- Crop Y
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、.wmv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.ogvファイルをダウンロードしてください。
WMVからOGVへの変換について
WMV uses Microsoft's proprietary VC-1 codec, while OGV (Ogg Video) uses the Theora video codec: a completely patent-free format released into the public domain by On2 Technologies via the Xiph.Org Foundation. OGV combines Theora video with Vorbis audio in the OGG container. It was the primary open-source web video format during the early HTML5 era and remains the required format for Wikipedia/Wikimedia Commons video uploads. Converting WMV to OGV moves Microsoft's proprietary content into the most legally unencumbered video format available.
WMVをOGVに変換する理由
OGV is the only video format where both the container and codecs are completely free of patent claims. This makes it mandatory for Wikipedia media, some government websites, and free software projects with strict licensing policies. If your WMV content must be distributed with zero patent liability, OGV is the only option that provides complete legal certainty.
主な活用例
- Converting WMV educational content for upload to Wikipedia or Wikimedia Commons
- Preparing WMV government training videos in a patent-free format for public distribution
- Creating OGV versions of WMV content for free software project documentation
- Converting WMV recordings for hosting on platforms that mandate open-source video formats
- Producing patent-free video from WMV sources for academic publishing platforms
仕組み
FFmpeg decodes VC-1 video and WMA audio from the ASF container, re-encodes video to Theora using libtheora at quality q1–q10, and audio to Vorbis using libvorbis. Theora supports resolutions up to 1080p theoretically but is most efficient at 480p–720p. The OGG container wraps both streams with metadata via Vorbis comments. Encoding speed is moderate — Theora is simpler than VP9 but less efficient.
品質とパフォーマンス
Theora is roughly one generation behind H.264 in compression efficiency. At 480p, Theora produces acceptable web-quality video at 1–2 Mbps. At 720p, target 3–5 Mbps for clean results. Above 720p, Theora's limitations become apparent — file sizes balloon without proportional quality gains. For the best OGV results, stay at 720p or below.
デバイス互換性
| Device | WMV | OGV |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
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
- 1Target 480p–720p for OGV — Theora's compression efficiency does not justify 1080p file sizes.
- 2Use quality level 6–7 for a reasonable balance of visual quality and file size.
- 3For Wikipedia uploads, ensure files are under 100 MB and properly licensed.
- 4Consider WebM as an alternative if your patent concerns allow Google's royalty-free VP8/VP9 license — it provides much better compression.
関連する変換
WMV to OGV conversion moves content from Microsoft's proprietary format to the most patent-free video format in existence. While Theora cannot match modern codecs, it satisfies strict open-source and legal requirements.
WMVとOGVの比較
| 特徴 | WMV | OGV |
|---|---|---|
| 正式名称 | Windows Media Video | Ogg Video |
| 拡張子 | .wmv | .ogv |