Convert MKV to OGV: Free Online Converter
Convert Matroska Video to Ogg Video online for free. Fast, secure video conversion with no watermarks or registration.
MKV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
MKV 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、.mkv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。
MKVからOGVへの変換について
OGV (Ogg Video) is the video variant of the Ogg container, combining Theora video with Vorbis audio in a fully open-source, royalty-free package. While largely superseded by WebM for web video, OGV remains relevant for open-source purism, Wikipedia video embeds, and legacy HTML5 fallback sources.
MKVをOGVに変換する理由
Wikimedia Commons, which hosts media for Wikipedia, standardized on Ogg Theora as its video format long before WebM gained traction. Millions of educational, historical, and documentary videos on Wikipedia are in OGV format. If you are contributing video content to Wikimedia projects, converting MKV to OGV is a requirement.
OGV also serves as a philosophical choice for the free software community. Projects that refuse to include any patent-encumbered technology (even if widely licensed, like H.264) use OGV exclusively. Linux distributions that ship only free software (Trisquel, PureOS) include OGV playback by default, and some organizations mandate it in their open-source compliance policies.
主な活用例
- Uploading video contributions to Wikimedia Commons and Wikipedia
- Distributing video in open-source software projects that mandate patent-free formats
- Providing HTML5 video fallback for browsers that support Theora but not H.264 (Firefox historically)
- Creating video content for educational platforms committed to open-format media
- Archiving video in a fully open, royalty-free container for long-term preservation projects
仕組み
FFmpeg transcodes the MKV video to Theora using the libtheora encoder, and the audio to Vorbis using libvorbis, packaging both in an Ogg container. Theora encoding quality ranges from 0 (worst) to 10 (best). Theora's compression efficiency is roughly equivalent to H.264 Baseline profile — usable but noticeably less efficient than H.264 High or H.265. Maximum practical resolution is 1080p, though encoding becomes very slow at high resolutions due to Theora's age.
品質とパフォーマンス
Theora at quality 7-8 produces acceptable results at 720p with bitrates around 2-4 Mbps. Compared to H.264 at the same bitrate, Theora shows more blocking artifacts in complex scenes and gradients. For informational content like screencasts, tutorials, and talking-head videos, the quality is perfectly adequate. For cinematic or high-motion content, expect visible compression artifacts compared to modern codecs.
デバイス互換性
| Device | MKV | OGV |
|---|---|---|
| Windows PC | Partial | 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
- 1Use Theora quality 6-7 for Wikimedia uploads — it balances file size and visual quality at the resolutions Wikipedia displays
- 2Limit resolution to 720p for OGV encoding since Theora's compression inefficiency means 1080p files become very large
- 3Pair with Vorbis quality 4-5 for audio to keep the overall file size proportional
- 4Consider WebM as a modern alternative if your use case does not strictly require OGV — VP9 is far more efficient
- 5Add metadata (title, description, license) during conversion so Wikimedia import tools can read them automatically
関連する変換
MKV to OGV is the right conversion when open-format compliance is mandatory, particularly for Wikimedia contributions and free software distribution.
MKVとOGVの比較
| 特徴 | MKV | OGV |
|---|---|---|
| 正式名称 | Matroska Video | Ogg Video |
| 拡張子 | .mkv | .ogv |