在线将 MPG 转换为 ALAC — 免费且快速 | ConvertIntoMP4 | ConvertIntoMP4

了解更多关于MPG转ALAC的信息

如何转换

Upload your .mpg file by dragging it into the upload area or clicking to browse.

Choose your output settings. The default settings work great for most files.

Click Convert and download your .m4a file when it's ready.

关于MPG转ALAC

MPG files contain MPEG-1/MPEG-2 video with MP2 audio — the standard codec pairing for DVDs, Video CDs, and digital TV recordings. ALAC (Apple Lossless Audio Codec) provides lossless compression that preserves every decoded sample while achieving roughly 50% file size reduction compared to raw PCM. Converting MPG to ALAC extracts the MP2 audio, decodes it, and re-encodes it losslessly in Apple's format for seamless integration with iTunes, Apple Music, and the wider Apple ecosystem.

为什么要将MPG转换为ALAC？

ALAC is the native lossless format for Apple's ecosystem. If you want to preserve audio from MPG sources (DVD rips, VHS digitizations, broadcast recordings) in the highest possible quality while keeping files manageable in size and fully compatible with iTunes, Apple Music, iPhone, and HomePod, ALAC is the optimal choice. It avoids the massive file sizes of AIFF while preserving every decoded audio sample.

常见使用场景

Archiving DVD audio collections in lossless quality on Apple devices
Preserving broadcast recording audio in a space-efficient lossless format for Apple Music
Extracting VCD soundtracks to lossless ALAC for future re-encoding flexibility
Building a lossless audio archive from digitized VHS tape audio (stored as MPG)
Creating Apple-compatible lossless audio from TV show recordings

工作原理

FFmpeg decodes the MP2 audio from the MPG container to raw PCM, then encodes it using the ALAC codec and wraps it in an M4A (MPEG-4 audio) container. ALAC compression reduces file sizes to approximately 50-70% of the equivalent raw PCM data while guaranteeing bit-perfect reconstruction. The M4A container supports full iTunes metadata including artist, album, artwork, and chapter markers.

质量与性能

ALAC encoding is mathematically lossless — the decoded MP2 audio is preserved perfectly. The output quality equals the original MP2 decode. While ALAC cannot restore detail lost in MP2 compression, it ensures no further degradation occurs, even after repeated editing and re-saving.

FFMPEG EngineModerateLossless

设备兼容性

Device	MPG	ALAC
Windows PC	Partial	Partial
macOS	Partial	Native
iPhone/iPad	Partial	Native
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No

各平台推荐设置

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

Resolution: 960x540

Bitrate: 2 Mbps

16MB limit for standard, 64MB for document

Discord

Resolution: 1280x720

Bitrate: 4 Mbps

8MB free, 50MB Nitro

获得最佳效果的技巧

1Use ALAC for Apple-centric libraries and FLAC for cross-platform archiving — the audio quality is identical
2The M4A container supports iTunes metadata — add artist, album, and artwork after conversion for a complete library entry
3For large MPG collections (e.g., complete DVD sets), batch convert to ALAC to save time while preserving quality
4If the MPG has multiple audio tracks (e.g., director commentary on a DVD), extract each track to a separate ALAC file
5Verify the original MP2 bitrate first — low bitrate MP2 (128 kbps) audio may not warrant lossless archiving since the source is already heavily compressed

常见问题

Yes, ALAC losslessly preserves the decoded MP2 audio. The only quality limitation comes from the original MP2 compression — ALAC itself introduces zero additional loss.

ALAC files contain only audio (no video) so they are much smaller than the full MPG. Compared to raw PCM, ALAC is roughly half the size. Compared to the original MP2, ALAC is typically 3-5x larger since MP2 is a lossy codec.

Android 3.1+ includes ALAC decoding support. However, FLAC has broader and more reliable support on Android devices and apps.

Both are lossless with identical quality. ALAC integrates better with Apple devices; FLAC is more universal and open-source. Choose based on your primary ecosystem.

DVD chapter markers are in the video stream, not the audio. They will not transfer to the audio-only ALAC output. Chapter markers would need to be manually added in iTunes.

Convert MPG to ALAC — Free Online Converter

如何转换

关于MPG转ALAC

为什么要将MPG转换为ALAC？

常见使用场景

工作原理

质量与性能

设备兼容性

各平台推荐设置

YouTube

Instagram

TikTok

Twitter/X

WhatsApp

Discord

获得最佳效果的技巧

相关转换

常见问题

相关转换与工具

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将其他格式转换为ALAC

将MPG转换为其他格式

将其他格式转换为ALAC

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MPG 与 ALAC 对比

特性	MPG	ALAC
全称	MPEG Video	Apple Lossless Audio Codec
扩展名	.mpg	.m4a
最适合	Universal support	Lossless