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Convert MPG to WebM: Free Online Converter

Convert MPEG Video 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

MPG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

MPG 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

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、.mpg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。

MPGからWebMへの変換について

MPG files use MPEG-1/MPEG-2 video with MP2 audio: codecs from the VCD and DVD era that are poorly supported on the modern web. WebM is Google's open, royalty-free video format using VP8/VP9 video and Vorbis/Opus audio, designed specifically for HTML5 web video. Converting MPG to WebM brings legacy disc and broadcast content to the web with modern compression efficiency and native browser playback.

MPGをWebMに変換する理由

WebM is natively supported by Chrome, Firefox, Edge, and Opera for seamless HTML5 video playback without plugins. VP9 offers compression efficiency roughly 30-50% better than MPEG-2, meaning MPG content can be served at significantly lower bandwidth while maintaining equivalent visual quality. For web publishers with legacy MPG content, WebM conversion enables efficient, universal web delivery.

主な活用例

  • Publishing DVD content on websites using HTML5 <video> elements
  • Uploading broadcast recordings to web platforms that optimize for open formats
  • Creating web-optimized versions of educational DVD libraries for online courses
  • Serving legacy broadcast footage through web-based media portals
  • Producing WebM video for embedding in Progressive Web Apps

仕組み

FFmpeg decodes MPEG-1/2 video (deinterlacing if needed) and MP2 audio, then re-encodes using libvpx-vp9 for video and libopus for audio. VP9 two-pass encoding provides the best quality-to-size ratio. CRF (constant rate factor) mode with CRF 31-33 produces good 1080p quality. The output uses the WebM (Matroska subset) container with cues at the beginning for instant seeking in web players.

品質とパフォーマンス

VP9 achieves roughly 30-50% better compression than MPEG-2 at equivalent quality. A DVD-quality MPG at 5 Mbps MPEG-2 produces comparable quality at 2-3 Mbps VP9. The modern codec eliminates the blocking artifacts typical of MPEG-2 at moderate bitrates. Opus audio at 128 kbps easily matches or exceeds MP2 at 192 kbps.

Media EngineModerateMinimal Quality Loss

デバイス互換性

DeviceMPGWebM
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-to-size ratio — single-pass is faster but produces larger files at the same quality
  • 2Deinterlace all DVD and broadcast MPG sources — WebM and web players only support progressive video
  • 3CRF 31-33 for VP9 produces good 1080p web quality — lower CRF means better quality but larger files
  • 4Opus at 128 kbps provides excellent web audio quality — no need to go higher for typical content
  • 5For web embedding, include an MP4 <source> fallback for older Safari versions

関連する変換

MPG to WebM is the ideal conversion for bringing legacy disc and broadcast video to the web. VP9's superior compression and universal browser support make WebM the standard for open web video delivery.

MPGとWebMの比較

特徴MPGWebM
正式名称MPEG VideoWebM Video
拡張子.mpg.webm

よくある質問

VP9 achieves comparable quality at roughly 40-60% of the MPEG-2 bitrate. A 4 GB DVD rip might become 1.5-2.5 GB in WebM VP9.
Safari 14.1+ (macOS Big Sur, iOS 15) supports VP9/WebM. Older Safari versions do not — provide MP4 fallback for maximum compatibility.
VP9 for all modern use cases. VP9 offers roughly 50% better compression than VP8. Use VP8 only if targeting very old browsers.
VP9 encoding is 3-5x more computationally intensive than H.264. Two-pass mode doubles encoding time but significantly improves quality. This is a one-time cost for permanent bandwidth savings.
WebM is progressive-scan only. Interlaced MPG sources must be deinterlaced during conversion, which the conversion tool handles automatically.

関連する変換とツール

MPGから他の形式への変換

他の形式からWebMへの変換

関連ツール

MPGを他の形式に変換

他の形式をWebMに変換