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Convert RMVB to WebM: Free Online Converter

Convert RealMedia Variable Bitrate to WebM Video online for free. Fast, secure video conversion with no watermarks or registration.

163,297件のファイルを変換済み

RMVB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

Format: HH:MM:SS (leave empty to start from beginning)

Format: HH:MM:SS (leave empty to keep until end)

0100%200

0% = silent, 100% = original, 200% = double loudness

00s10

Gradually fade the audio track in over this many seconds

00s10

Gradually fade the audio track out over the final seconds

Keep original audio cannot be combined with volume, fades, bitrate or sample rate.

Makes a silent video.

高度なコーデックにアップグレード
03163

Lower = better quality, larger file. Default: 31

Horizontal offset (px) from left edge

Vertical offset (px) from top edge

Width of crop area (px). 0 = no crop

Height of crop area (px). 0 = no crop

Subtitles already inside the source file

Remove EXIF data, GPS, camera info

Replaces the quality setting when chosen.

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

RMVB から WebM への設定

エンジン
メディア
設定
調整できる設定: 27
  • Trim Start
  • Trim End
  • Volume
  • Audio Fade In
  • Audio Fade Out
  • Video Codec
  • Quality (CRF)
  • Resolution
  • Frame Rate
  • Aspect Ratio
  • Resize Mode
  • Audio Channels

変換方法

1

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、.rmvbファイルをアップロードしてください。

2

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。

3

「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。

RMVBからWebMへの変換について

WebM is Google's open, royalty-free video format designed for the web, pairing VP9 video with Opus audio in a Matroska-based container. RMVB was designed for streaming but in a proprietary, now-obsolete way. Converting RMVB to WebM modernizes the content for web-native playback in Chrome, Firefox, Edge, and Opera: no plugins, no codecs, no proprietary decoders required. VP9 significantly outperforms RealVideo in compression efficiency.

RMVBをWebMに変換する理由

RMVB cannot be played in any web browser. WebM is one of the two HTML5 video formats (alongside MP4) supported natively in browsers. For publishing RMVB content on the web, WebM provides an open, patent-free alternative to MP4. VP9 also produces excellent quality at lower bitrates than H.264, reducing bandwidth costs.

主な活用例

  • Publishing RMVB content on websites using HTML5 video elements
  • Uploading RMVB videos to YouTube (which internally uses VP9)
  • Creating web-optimized video from RMVB archives for blogs and portfolios
  • Preparing RMVB content for web-based video players and CDNs
  • Converting RMVB files for open-source web applications requiring patent-free video

仕組み

FFmpeg decodes RealVideo and RealAudio, then encodes to VP9 using libvpx-vp9 with two-pass encoding for optimal bit allocation. Audio is encoded to Opus at 128 kbps. VP9 encoding uses CRF 31 (equivalent to H.264 CRF ~23 in visual quality). The WebM container includes cues at the start for instant seeking.

品質とパフォーマンス

VP9 at CRF 31 produces quality that significantly exceeds the original RMVB. VP9 is roughly twice as efficient as RealVideo, meaning the WebM output looks substantially better at similar file sizes — or achieves similar quality at half the size.

Media EngineModerateMinimal Quality Loss

デバイス互換性

DeviceRMVBWebM
Windows PCPartialPartial
macOSPartialPartial
iPhone/iPadPartialPartial
AndroidPartialNative
LinuxPartialNative
Web BrowserNoNative

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

Instagram

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

WhatsApp

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 two-pass VP9 encoding for the best quality distribution across scenes — it's slower but produces noticeably better results.
  • 2Set CRF to 31 for web video — this is the VP9 equivalent of H.264 CRF 23 in visual quality.
  • 3Provide both WebM and MP4 in HTML5 video elements for maximum browser compatibility.
  • 4For 4K web content, WebM/VP9 offers the best file sizes — VP9's efficiency advantage grows at higher resolutions.

関連する変換

RMVB to WebM conversion modernizes legacy RealMedia content for the web era. VP9's superior efficiency produces better quality at smaller sizes, while the open format ensures patent-free web publishing.

RMVBとWebMの比較

特徴RMVBWebM
正式名称RealMedia Variable BitrateWebM Video
拡張子.rmvb.webm

よくある質問

VP9 (WebM) and H.264 (MP4) are comparable in quality. WebM is patent-free and slightly more efficient at higher resolutions. MP4 has broader device support. For web-only delivery, both are excellent choices.
Safari 14.1+ (macOS Big Sur) supports VP9 WebM. iOS Safari added WebM support in iOS 16.4. For older Apple devices, provide MP4 as fallback.
VP9's encoder uses more complex algorithms than H.264 for better compression. Two-pass encoding doubles the time but significantly improves quality. Expect 3-10x longer encoding than H.264.
Yes — WebM uses progressive download by default. Ensure your web server serves .webm with the correct MIME type (video/webm).
At equivalent visual quality, WebM is typically 30-50% smaller than the RMVB source. VP9's efficiency advantage over RealVideo is substantial.

関連する変換とツール

他の形式からWebMへの変換

関連ツール

RMVBを他の形式に変換

他の形式をWebMに変換