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支持的格式
以高质量在所有主要文件格式之间转换
常见格式
MPEG-1音频层III - 全球最通用的音频格式，使用有损压缩将文件大小减少90%，同时保持出色的感知质量。非常适合音乐库、播客、便携设备以及任何需要广泛兼容性的场景。支持32-320kbps的比特率。自1993年以来成为数字音乐的标准，几乎可以在每个设备和平台上播放。
Waveform Audio File Format - uncompressed PCM audio providing perfect quality preservation. Standard Windows audio format with universal compatibility. Large file sizes (10MB per minute of stereo CD-quality). Perfect for audio production, professional recording, mastering, and situations requiring zero quality loss. Supports various bit depths (16, 24, 32-bit) and sample rates. Industry standard for professional audio work.
Ogg Vorbis - 开源有损音频编码器，提供与MP3/AAC相当的质量，且比特率相似。无专利和许可限制。与MP3在相同质量下文件大小更小。用于游戏、开源软件和流媒体。支持可变比特率（VBR），以获得最佳质量。非常适合需要免费编码器和良好质量的应用。媒体播放器和平台的支持不断增加。
Advanced Audio Coding - successor to MP3 offering better quality at same bitrate (or same quality at lower bitrate). Standard audio codec for Apple devices, YouTube, and many streaming services. Supports up to 48 channels and 96kHz sample rate. Improved frequency response and handling of complex audio. Perfect for iTunes, iOS devices, video streaming, and modern audio applications. Part of MPEG-4 standard widely supported across platforms.
无损音频压缩编码器 - 在不损失任何质量的情况下压缩音频40-60%。完美保留原始音频的逐位精度。开放源代码格式，无专利或许可费用。支持高分辨率音频（192kHz/24-bit）。非常适合归档音乐收藏、音响爱好者听音和质量至关重要的场景。广泛支持媒体播放器和流媒体服务。质量与文件大小之间的理想平衡。
MPEG-4 Audio - AAC or ALAC audio in MP4 container. Standard audio format for Apple ecosystem (iTunes, iPhone, iPad). Supports both lossy (AAC) and lossless (ALAC) compression. Better quality than MP3 at same file size. Includes metadata support for artwork, lyrics, and rich tags. Perfect for iTunes library, iOS devices, and Apple software. Widely compatible across platforms despite Apple association. Common format for purchased music and audiobooks.
Windows Media Audio - Microsoft's proprietary audio codec with good compression and quality. Standard Windows audio format with native OS support. Supports DRM for protected content. Various profiles (WMA Standard, WMA Pro, WMA Lossless). Comparable quality to AAC at similar bitrates. Perfect for Windows ecosystem and legacy Windows Media Player. Being superseded by AAC and other formats. Still encountered in Windows-centric environments and older audio collections.
无损格式
Apple Lossless Audio Codec - Apple's lossless compression reducing file size 40-60% with zero quality loss. Perfect preservation of original audio like FLAC but in Apple ecosystem. Standard lossless format for iTunes and iOS. Supports high-resolution audio up to 384kHz/32-bit. Smaller than uncompressed but larger than lossy formats. Perfect for iTunes library, audiophile iOS listening, and maintaining perfect quality in Apple ecosystem. Comparable to FLAC but with better Apple integration.
Monkey's Audio - 高效的无损压缩，达到比FLAC更好的压缩比（通常为原始文件的55-60%）。完美保留质量，零损失。免费格式，开放规范。压缩/解压缩速度比FLAC慢。受到音响爱好者社区的欢迎。与FLAC相比，播放器支持有限。非常适合在最大空间节省的情况下进行归档，同时保持完美质量。最适合存储空间至关重要而处理速度不重要的场景。
WavPack - hybrid lossless/lossy audio codec with unique correction file feature. Can create lossy file with separate correction file for lossless reconstruction. Excellent compression efficiency. Perfect for flexible audio archiving. Less common than FLAC. Supports high-resolution audio and DSD. Convert to FLAC for universal compatibility.
True Audio - lossless audio compression with fast encoding/decoding. Similar compression to FLAC with simpler algorithm. Open-source and free format. Perfect quality preservation. Less common than FLAC with limited player support. Perfect for audio archiving when FLAC compatibility not required. Convert to FLAC for broader compatibility.
Audio Interchange File Format - Apple's uncompressed audio format, equivalent to WAV but for Mac. Stores PCM audio with perfect quality. Standard audio format for macOS and professional Mac audio applications. Supports metadata tags better than WAV. Large file sizes like WAV (10MB per minute). Perfect for Mac-based audio production, professional recording, and scenarios requiring uncompressed audio on Apple platforms. Interchangeable with WAV for most purposes.
现代格式
Opus音频编码器 - 现代开源编码器（2012年）在6kbps到510kbps的所有比特率下提供最佳质量。对语音和音乐表现出色。现代编码器中延迟最低，非常适合VoIP和实时通信。在相同比特率下优于MP3、AAC和Vorbis。被WhatsApp、Discord和WebRTC使用。非常适合流媒体、语音通话、播客和音乐。正在成为互联网音频的通用音频编码器。
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Matroska Audio - audio-only Matroska container supporting any audio codec. Flexible format with metadata support. Can contain multiple audio tracks. Perfect for audio albums with chapters and metadata. Part of Matroska multimedia framework. Used for audiobooks and multi-track audio. Convert to FLAC or MP3 for universal compatibility.
遗留格式
MPEG-1音频层II - MP3的前身，用于广播和DVD。在高比特率下质量优于MP3。DVB（数字电视）和DVD-Video的标准音频编码器。压缩效率低于MP3。非常适合广播应用和DVD制作。作为遗留格式正在被AAC取代，仍在数字电视和视频制作工作流程中遇到。
Dolby Digital (AC-3) - surround sound audio codec for DVD, Blu-ray, and digital broadcasting. Supports up to 5.1 channels. Standard audio format for DVDs and HDTV. Good compression with multichannel support. Perfect for home theater and video production. Used in cinema and broadcast. Requires Dolby license for encoding.
Adaptive Multi-Rate - speech codec optimized for mobile voice calls. Excellent voice quality at very low bitrates (4.75-12.2 kbps). Standard for GSM and 3G phone calls. Designed specifically for speech, not music. Perfect for voice recordings, voicemail, and speech applications. Used in WhatsApp voice messages and mobile voice recording. Efficient for voice but inadequate for music.
Sun/NeXT Audio - simple audio format from Sun Microsystems and NeXT Computer. Uncompressed or μ-law/A-law compressed audio. Common on Unix systems. Simple header with audio data. Perfect for Unix audio applications and legacy system compatibility. Found in system sounds and Unix audio files. Convert to WAV or MP3 for modern use.
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RealAudio - legacy streaming audio format from RealNetworks (1990s-2000s). Pioneered internet audio streaming with low-bitrate compression. Obsolete format replaced by modern streaming technologies. Poor quality by today's standards. Convert to MP3 or AAC for modern use. Historical importance in early internet audio streaming.
专业格式
DTS Coherent Acoustics - surround sound codec competing with Dolby Digital. Higher bitrates than AC-3 with potentially better quality. Used in DVD, Blu-ray, and cinema. Supports up to 7.1 channels and object-based audio. Perfect for high-quality home theater. Premium audio format for video distribution. Convert to AC-3 or AAC for broader compatibility.
Core Audio Format - Apple's container for audio data on iOS and macOS. Supports any audio codec and unlimited file sizes. Modern replacement for AIFF on Apple platforms. Perfect for iOS app development and professional Mac audio. No size limitations (unlike WAV). Can store multiple audio streams. Convert to M4A or MP3 for broader compatibility outside Apple ecosystem.
VOC (Creative Voice File) - audio format from Creative Labs Sound Blaster cards. Popular in DOS era (1989-1995) for games and multimedia. Supports multiple compression formats and blocks. Legacy PC audio format. Common in retro gaming. Convert to WAV or MP3 for modern use. Important for DOS game audio preservation.
Speex - open-source speech codec designed for VoIP and internet audio streaming. Variable bitrate from 2-44 kbps. Optimized for speech with low latency. Better than MP3 for voice at low bitrates. Being superseded by Opus. Perfect for voice chat, VoIP, and speech podcasts. Legacy format replaced by Opus in modern applications.
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如何转换文件
上传您的文件，选择输出格式，立即下载转换后的文件。我们的转换器支持批量转换并保持高质量。
常见问题
什么是 M4R，它与 M4A 有何不同？
M4R is Apple's iPhone ringtone format - it's literally identical to M4A (AAC audio in MPEG-4 container) with only the file extension changed to .m4r. When you create custom iPhone ringtone, iTunes/Music app changes .m4a to .m4r. iOS recognizes .m4r as ringtone, .m4a as regular music. Same audio format, different purpose label.
The only real difference: 30-second length limit for ringtones. M4R files are typically 15-30 seconds (iOS ringtone duration limit). M4A files can be any length. Audio quality, codec, container structure - all identical. M4R is marketing designation, not technical format difference.
我应该将 M4R 转换为 M4A 还是 MP3？
转换 M4R 的原因：
非 iPhone 设备
M4R only recognized by iOS. Android, Windows, other systems treat it as unknown format. Convert for compatibility.
音乐播放器
音乐库软件忽略 M4R 文件。转换为 M4A 使它们可以在您的库中播放。
共享音频
发送 M4R 文件会让非 iPhone 用户感到困惑。出现“无法播放此文件”的消息。M4A/MP3 在各平台上通用。
提取音频片段
如果您想将铃声音频用于其他目的，请转换为标准格式。解锁内容。
将 M4R 转换为 M4A（保持 AAC 质量）或 MP3（最大兼容性）。或者只需将 .m4r 重命名为 .m4a - 这样也可以！
将 M4R 转换为 M4A 会失去质量吗？
M4R 转 M4A 转换质量：
重命名时零损失
M4R 和 M4A 是相同的格式。将 .m4r 重命名为 .m4a 是无损的 - 文件相同，扩展名不同。
提取时零损失
FFmpeg with `-codec:a copy` extracts AAC without re-encoding. Perfect quality preservation.
转码时会有损失
将 M4R AAC 转换为 MP3 是有损到有损的转码。一些质量下降。尽量避免。
已经压缩
M4R 使用 AAC（有损编解码器）。转换为另一个有损格式会加重压缩伪影。
推荐的方法
对于 M4A 输出：重命名或提取而不重新编码。对于 MP3：接受转码损失或找到原始来源。
最佳实践
如果保持 AAC 格式，简单重命名可以保留一切。只有在绝对需要不同编解码器时才进行转码。
质量已经有限
铃声通常使用较低的比特率（128kbps 是典型值）。质量上限较低。转码带来的额外损失影响较小。
M4R 转 M4A 是无损的（只需重命名）。M4R 转 MP3 会失去质量，但铃声已经压缩，因此影响较小。
我可以只将 M4R 重命名为 M4A 吗？
可以！M4R 和 M4A 是相同的格式。将 .m4r 文件重命名为 .m4a 后，可以在任何支持 AAC/M4A 的软件中播放。无需转换，无质量损失，立即兼容。右键单击文件，重命名，将扩展名从 .m4r 更改为 .m4a，完成。
Windows users: You need to show file extensions first. Open folder, View tab, check 'File name extensions' box. Then you can rename .m4r to .m4a. Without seeing extensions, you can't change them.
Mac 用户：右键单击（Control+单击）M4R 文件，获取信息，在名称和扩展名部分，将扩展名更改为 .m4a。macOS 会警告“您确定吗？” - 确认。文件立即可在音乐应用、QuickTime 等中播放。
我如何创建自定义 iPhone 铃声？
Start with audio file (MP3, M4A, any format). Trim to 30 seconds or less (iOS ringtone limit is technically 40 seconds but 30 is recommended). Use GarageBand (iOS/Mac), iTunes, or online ringtone makers to export as M4R. Sync to iPhone via Finder/iTunes (cable) or AirDrop.
Alternative method: Convert audio to M4A/AAC, trim to 30 seconds, rename to .m4r extension. Transfer to iPhone. This works! iOS doesn't verify M4R files rigorously - if it's AAC audio under 40 seconds with .m4r extension, iPhone accepts it.
Modern iOS: You can also download ringtones from Tone Store ($0.99-$1.99) or use GarageBand app on iPhone to create custom ringtones directly on device. Easier than computer method but less flexible. For free custom ringtones, computer method is best.
M4R 铃声的最大长度是多少？
iOS allows ringtones up to 40 seconds, but Apple recommends 30 seconds maximum. Longer ringtones work technically but might cause issues or get truncated by iOS. Most commercial ringtones are 20-30 seconds - long enough for distinctive sound, short enough to not be annoying.
为什么是 30 秒？电话通常在 30 秒内被接听或转入语音信箱。较长的铃声会变得令人烦恼。15-30 秒的范围是最佳选择 - 足够长以识别自定义音调，又足够短以不让人抓狂。
创建铃声：使用歌曲中最佳的 30 秒 - 副歌、钩子、独特部分。不要仅使用前 30 秒。选择可识别的片段。许多铃声创建工具会自动修剪到 30 秒 - 选择要保留的部分。
我如何将 M4R 转换为 M4A 或 MP3？
简单重命名方法：将 .m4r 扩展名更改为 .m4a。文件立即可播放。无需转换。右键单击，重命名，完成。这是 M4A 输出最简单且无损的方法。
FFmpeg extraction: `ffmpeg -i ringtone.m4r -codec:a copy output.m4a` extracts AAC without re-encoding. Perfect quality. For MP3: `ffmpeg -i ringtone.m4r -codec:a libmp3lame -q:a 2 output.mp3` converts to MP3 (lossy transcoding but acceptable).
在线转换器：我们的转换器和其他转换器支持 M4R。上传，选择 M4A（保持质量）或 MP3（兼容性），下载。适合偶尔转换。对于许多文件，重命名方法（M4R 转 M4A）是最快的。
Why can't I play M4R files on Android?
M4R Android compatibility issues:
扩展名未被识别
Android doesn't recognize .m4r as valid audio format. File browser shows 'Unknown' file type. Can't open.
编解码器正常
M4R contains AAC - Android supports AAC perfectly. Problem is .m4r extension, not audio format.
简单修复
Rename .m4r to .m4a. Android instantly recognizes file and plays it normally. Same audio, accepted extension.
或者转换
Convert M4R to MP3 for guaranteed compatibility. MP3 works on everything including oldest Android devices.
Apple Ecosystem
M4R is Apple-specific designation. Other platforms don't understand it. Use standard extensions for cross-platform files.
Android doesn't play M4R because it doesn't recognize extension. Rename to M4A or convert to MP3 - problem solved.
我可以将 M4R 文件用作普通音乐吗？
可以，但铃声通常太短（15-30 秒），如果用作音乐可能会循环得很尴尬。音频质量与 M4A 相同 - 使用相同的 AAC 编解码器。如果您想听铃声音频片段，请重命名为 .m4a 并在任何音乐播放器中播放。
然而，铃声是完整歌曲的摘录，而不是完整曲目。您正在听的是 30 秒的片段，而不是完整的音乐体验。如果您想要实际的歌曲，请找到原始音频来源，而不是使用铃声版本。
实际使用：有些人提取 M4R 铃声以在没有 iPhone 的情况下听音频片段，或在视频/项目中重新利用铃声音频。从技术上讲是可以的 - AAC 质量得以保留。只需理解您正在处理的是短片段，而不是完整曲目。
我如何批量转换 M4R 文件？
批量 M4R 转换方法：
Batch Rename (Windows)
PowerShell：`Get-ChildItem *.m4r | Rename-Item -NewName { $_.Name -replace '.m4r','.m4a' }`。即时，无损。
Batch Rename (Mac/Linux)
`for f in *.m4r; do mv "$f" "${f%.m4r}.m4a"; done`。将所有 M4R 重命名为 M4A。简单，快速。
FFmpeg Batch Convert
`for f in *.m4r; do ffmpeg -i "$f" -codec:a copy "${f%.m4r}.m4a"; done`。提取而不重新编码。
批量转换为 MP3
FFmpeg: `Get-ChildItem *.m4r | ForEach-Object { ffmpeg -i $_.Name -codec:a libmp3lame -q:a 2 "$($_.BaseName).mp3" }`
图形用户界面批量
Bulk Rename Utility (Windows), Name Mangler (Mac) for mass extension changes. Visual interface.
选择方法
Rename for M4A (instant, lossless). FFmpeg for MP3 (transcoding required). Context determines approach.
验证输出
在处理数百个文件之前测试一个文件。确保在目标软件/设备中可以播放。
组织输出
将转换后的文件移动到单独的文件夹。保留原始文件直到验证完成。这是良好的工作流程实践。
元数据已保留
Renaming and FFmpeg copy preserve tags/artwork. Transcoding may require tag migration verification.
效率
对于 M4A 输出：重命名是即时的（每秒数千个）。对于 MP3：转换时间取决于数量。
M4R 文件是否具有元数据和艺术作品？
是的，M4R 支持与 M4A 相同的元数据 - 包含艺术家、标题、专辑、流派和艺术作品的 iTunes/ID3 标签。当您在 iTunes 中从歌曲创建铃声时，通常会保留原始歌曲的元数据。然而，许多铃声的标签很少或缺失。
来自 Tone Store 的商业铃声具有正确的元数据。从个人音乐创建的自定义铃声可能有标签，也可能没有 - 这取决于创建方法。GarageBand 铃声通常具有基本的元数据。
编辑标签：Mp3tag、Kid3 或 iTunes 可以像编辑 M4A 文件一样编辑 M4R 元数据。转换/重命名为 M4A 后，正常标记。一些标签编辑器可能无法识别 .m4r 扩展名 - 暂时重命名为 .m4a 进行编辑。
Can I use M4R ringtones on Android?
Yes, with conversion! Rename M4R to M4A or convert to MP3, then transfer to Android phone. Place in Ringtones folder (/storage/emulated/0/Ringtones or similar). Android detects audio files in Ringtones folder and makes them available in sound settings.
Android accepts MP3, M4A/AAC, OGG as ringtones. M4R isn't recognized due to extension. Once converted to accepted format, Android treats it like any custom ringtone. No special setup needed - just place in right folder.
Quality consideration: If M4R is high-bitrate AAC, keep as M4A (Android supports AAC well). If you need maximum compatibility across old Android versions, convert to MP3. Either works for modern Android devices.
为什么 iTunes 创建 M4R 而不是 M4A？
Categorization: iTunes/iOS organize media by file extension. .m4a = music (goes to Music app), .m4r = ringtone (goes to Tones section). Separate extensions enable automatic sorting and syncing to correct iPhone categories.
用户体验：没有明显的扩展名，铃声会与音乐库混合。用户在数千首歌曲中会很难找到铃声。.m4r 扩展名使铃声在 iTunes/Finder 中保持分离，简化管理。
Technical perspective: It's artificial distinction - formats are identical. Apple could use file metadata instead of extension for categorization. But extension-based sorting is simpler and works at filesystem level. Typical Apple ecosystem approach.
我如何从 iPhone 铃声中提取音频？
From iPhone: Connect iPhone to computer, open Finder (Mac) or iTunes (Windows), go to device's Tones section. Drag M4R files from Tones to desktop. They copy to computer as M4R files ready for conversion.
提取后：将 .m4r 重命名为 .m4a 以进行播放，或转换为 MP3 以获得最大兼容性。音频为高质量 AAC - 铃声长度但音质良好。对于恢复音频片段或重新利用铃声声音非常有用。
Modern iOS/Mac: With newer iOS and macOS versions, ringtones may sync via iCloud. Check ~/Library/Sounds (Mac) or iPhone backup locations for M4R files. Or use third-party iPhone file browsers (iMazing, iFunbox) to access Tones folder directly.
M4R 与 M4A - 我应该使用哪个？
Use M4R for: iPhone ringtones only. If creating/syncing ringtones to iOS devices, keep as M4R. iTunes/iOS recognize M4R as ringtones automatically. Simplifies organization in Apple ecosystem.
使用 M4A 处理：其他所有内容 - 音乐库、音频片段、语音录音、一般音频文件。M4A 是通用认可的标准 AAC 容器。适用于所有平台、所有设备、所有软件。
Practical advice: Create ringtones as M4R for iOS use. Convert/rename to M4A when extracting ringtone audio for other purposes. Don't use M4R outside Apple ringtone context - it confuses software and users. M4A is standard format for AAC audio in all other scenarios. Choose based on actual use case.