Convert MPEG to AAC: Free Online Converter
Convert MPEG Video to Advanced Audio Coding online for free. Fast, secure video conversion with no watermarks or registration.
MPEG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
MPEG から AAC への設定
- エンジン
- メディア
- 設定
- 調整できる設定: 12
- Trim Start
- Trim End
- Volume
- Fade In
- Fade Out
- Bitrate
- Sample Rate
- Channels
- Normalize Volume
- Audio Channels
- Reverse Audio
- Strip Metadata
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、.mpeg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.aacファイルをダウンロードしてください。
MPEGからAACへの変換について
MPEG video files carry both video and audio tracks, with the audio typically encoded as MPEG Audio Layer 2 (MP2) at 192-384 kbps. AAC (Advanced Audio Coding) is the successor to MP3, standardized in MPEG-2 Part 7 and refined in MPEG-4 Part 3, delivering better sound quality at equivalent bitrates. Extracting audio from MPEG to AAC preserves more fidelity per kilobyte than converting to MP3.
MPEGをAACに変換する理由
MPEG Audio Layer 2 is a capable codec, but it lacks the psychoacoustic refinements of AAC. At 128 kbps, AAC achieves audio quality comparable to MP2 at 192 kbps, making it significantly more storage-efficient. AAC is also the native audio format for Apple devices, iTunes, YouTube, and most streaming platforms.
Extracting audio from MPEG recordings — such as TV captures, VHS digitizations, or DVD rips — into AAC gives you compact, high-quality audio files ready for modern playback ecosystems. Whether you need podcast-ready speech from a broadcast recording or a clean music track from a concert tape, AAC provides the best lossy quality available.
主な活用例
- Extracting dialogue tracks from recorded television broadcasts for podcast repurposing
- Pulling music from VHS-era concert recordings digitized to MPEG
- Creating audio-only versions of educational lectures stored in MPEG format
- Building a mobile playlist from a library of DVD-ripped MPEG files
- Isolating commentary audio from archived sports broadcasts
仕組み
FFmpeg strips the video stream entirely and re-encodes the MP2 audio to AAC using the native FFmpeg AAC encoder or libfdk_aac (higher quality). Typical parameters: `-vn -acodec aac -b:a 192k -ar 44100`. The VBR mode (`-q:a 2`) is recommended for variable-bitrate encoding that allocates more bits to complex passages and fewer to silence.
品質とパフォーマンス
Since both MP2 and AAC are lossy codecs, there is a generational quality loss. However, if the source MP2 was encoded at 256 kbps or higher, transcoding to AAC at 192 kbps VBR will produce output that is perceptually transparent to most listeners. For archival purposes, consider extracting to FLAC first, then re-encoding to AAC.
デバイス互換性
| Device | MPEG | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| 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 VBR mode (-q:a 2 in FFmpeg) for optimal quality-to-size ratio — it adapts bitrate to audio complexity
- 2Normalize audio levels after extraction if the source MPEG had inconsistent volume (common in TV recordings)
- 3Check if the MPEG audio is already MP3 — if so, you can extract it losslessly with `-acodec copy` to MP3 instead
- 4For speech-only content like lectures, 96 kbps AAC-HE provides excellent intelligibility at tiny file sizes
- 5Add metadata tags (title, artist, album) during conversion to keep your audio library organized
関連する変換
MPEG to AAC extraction lets you salvage high-quality audio from bulky legacy video files, producing compact files that play natively on every modern device and platform.
MPEGとAACの比較
| 特徴 | MPEG | AAC |
|---|---|---|
| 正式名称 | Moving Picture Experts Group | Advanced Audio Coding |
| 拡張子 | .mpeg | .aac |