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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 Being superseded by AAC and other formats.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 CAF（核心音频格式），它在哪里使用？
CAF (Core Audio Format) is Apple's professional audio container format introduced in Mac OS X Tiger (2005) as part of Core Audio framework. It's designed to overcome limitations of WAV and AIFF - supports files larger than 4GB, any sample rate and bit depth, unlimited channels, flexible metadata, and any audio codec. CAF is Apple's answer to 'perfect' audio container.
Where CAF appears: iOS/Mac audio recording (Voice Memos sometimes use CAF), Logic Pro projects (professional audio production), macOS system sounds, GarageBand recordings, and professional audio applications on Apple platforms. If you've recorded audio on iPhone or Mac, you might have CAF files even if you didn't know the format name.
我应该将 CAF 转换为 M4A 还是 MP3？
转换 CAF 的强烈理由：
有限的兼容性
CAF works on Apple devices but not much else. M4A/MP3 work everywhere. Convert for universal playback.
共享文件
Sending CAF confuses non-Apple users. 'What's this format?' messages. M4A/MP3 are universally recognized.
网络和云
浏览器不支持 CAF。云服务期望标准格式。为网络播放和在线存储转换。
Android Incompatible
Android phones can't play CAF. If sharing with Android users, convert to AAC/MP3. Cross-platform compatibility essential.
Convert CAF to M4A (Apple-friendly AAC) or MP3 (universal). Keep CAF only for professional Apple-exclusive workflows.
将 CAF 转换为 M4A 会失去质量吗？
CAF 转换为 M4A 的转换质量：
取决于编解码器
CAF 是容器。如果 CAF 包含 AAC，提取为 M4A 是无损的（相同编解码器）。如果是其他编解码器，则需要转换。
AAC CAF 转换为 M4A
完美的质量保留。两者都是不同容器中的 AAC 编解码器。只是重新包装音频流。
ALAC CAF 转换为 M4A
无损的 ALAC 在 CAF 中完美转换为 ALAC M4A。M4A 和 CAF 都支持 ALAC 编解码器。
Lossy to Lossy
如果将 CAF 中的某个有损编解码器转换为不同的有损编解码器（MP3，Opus），质量会下降。转码损失。
PCM/未压缩
将带有 PCM 的 CAF 转换为 AAC M4A 是有损压缩。故意的 - 大文件变为实用大小。
高分辨率音频
CAF 支持任何采样率/位深度。将高分辨率转换为标准 M4A 可能会降采样。检查设置。
最佳实践
首先识别 CAF 编解码器，尽可能将输出格式与编解码器匹配。避免不必要的转码。
CAF 编解码器决定质量结果。CAF 中的 AAC 转换为 M4A 是无损的。其他编解码器可能会失去质量。
我的 CAF 文件中包含什么音频编解码器？
Check with FFmpeg: `ffmpeg -i file.caf` shows audio codec. Look for 'Audio: aac' (lossy), 'Audio: alac' (lossless), 'Audio: pcm' (uncompressed), 'Audio: opus', etc. CAF can contain virtually any codec - AAC, ALAC, PCM, MP3, Opus, FLAC, even obscure formats.
MediaInfo（图形用户界面工具）：以可读格式显示编解码器、比特率、采样率、通道。跨平台，免费。右键单击 CAF 文件，使用 MediaInfo 打开，查看完整技术细节。对普通用户来说比命令行更简单。
为什么这很重要：了解编解码器决定转换策略。AAC CAF → 提取为 M4A 而不重新编码。ALAC CAF → 保持无损或转换为 FLAC。PCM CAF → 压缩为 AAC/MP3 或保持为 WAV。不要盲目转码 - 首先检查编解码器。
Can I play CAF files on Windows or Android?
Windows: VLC plays CAF files. foobar2000 with proper codecs can handle CAF. Windows Media Player doesn't support CAF natively. Most consumer Windows software ignores CAF. You need specialized players or conversion.
Android: Native Android doesn't recognize CAF. VLC for Android might play CAF depending on codec inside. Most Android music apps show 'Unsupported format' error. Practically, CAF doesn't work on Android - convert to AAC/MP3 for Android playback.
Recommendation: Don't try to use CAF files cross-platform. Convert to M4A (Apple devices + modern systems) or MP3 (absolute universal compatibility). CAF is Apple-ecosystem format - treat it as such and convert for broader use.
我如何将 CAF 转换为 M4A 或 MP3？
FFmpeg (best method): `ffmpeg -i input.caf -codec:a aac -b:a 256k output.m4a` converts CAF to AAC M4A. For MP3: `ffmpeg -i input.caf -codec:a libmp3lame -q:a 2 output.mp3`. If CAF already contains AAC, use `-codec:a copy` to avoid re-encoding.
macOS native: Open CAF in QuickTime Player, File > Export As, choose format. Or use Finder's 'Encode Selected Audio Files' service (right-click, Services menu). macOS has built-in CAF handling since it's Apple format.
Online converters: Our converter and others support CAF. Upload, choose output format (M4A for quality, MP3 for compatibility), download. Easy for occasional conversions. For batch processing Mac recordings, FFmpeg scripting is most efficient.
Why did Apple create CAF instead of using existing formats?
WAV/AIFF 限制：两者都达到 4GB 文件大小限制（32 位大小字段）。对于专业音频（长录音、高采样率、多个通道），4GB 不够。CAF 使用 64 位字段 - 实际上没有文件大小限制。解决了真正的专业音频问题。
Flexibility: CAF supports any sample rate (including unusual ones), any bit depth, unlimited channels, any codec, extensible metadata, and packet-based streaming. It's designed to be 'future-proof' - whatever audio technology emerges, CAF can wrap it. Very Apple engineering philosophy.
Core Audio integration: CAF is native format for macOS/iOS Core Audio framework. Tight OS integration means efficient processing, system-level support, and seamless use in Apple professional audio apps. However, this Apple-centricity limited adoption elsewhere - classic Apple ecosystem lock-in.
CAF 的技术规格是什么？
核心音频格式规格：
文件大小
支持高达 16 Exabytes（64 位大小字段）。实际上没有限制。解决了 WAV/AIFF 的 4GB 限制。
采样率
任何采样率从 1Hz 到超过 4GHz。包括非标准采样率。适合研究/专业音频。
位深度
8、16、24、32 位整数。32、64 位浮点。支持任何位深度。专业灵活性。
通道
无限通道。从单声道到大型环绕声系统。包含通道布局元数据。
编解码器
支持任何编解码器 - AAC、ALAC、PCM、MP3、Opus、FLAC 等。与编解码器无关的容器。
CAF is technically sophisticated - Apple's answer to 'perfect' audio container. Features exceed most users' needs.
CAF 在质量上是否优于 M4A？
不！容器不决定质量 - 编解码器决定。CAF 和 M4A 都可以在相同比特率下包含相同质量的 AAC 编解码器。CAF 可以容纳未压缩的 PCM，而 M4A 通常不这样做（在实践中），但这并不是“更好的质量” - 只是不同的使用案例。
CAF 的优势在于技术：更大的文件支持、灵活的规格、无限通道。这些对专业音频制作很重要，而不是音乐欣赏。对于消费者音乐，AAC 256kbps 的 M4A 听起来与来自 CAF 或始终为 M4A 的文件相同。
Choose based on use: CAF for professional Apple audio work (Logic Pro, large files, unusual specs). M4A for music libraries, portable devices, compatibility. Quality is codec-dependent, not container-dependent. Don't fall for format quality myths.
CAF 文件可以包含元数据和艺术作品吗？
CAF 元数据支持：
丰富的元数据
CAF 支持广泛的元数据 - 艺术家、专辑、标题、流派、年份、作曲家、键/值对。灵活的系统。
专辑封面
可以在CAF文件中嵌入封面艺术。然而，软件支持不一致 - 许多播放器无法显示CAF艺术作品。
技术信息
采样率、位深、通道布局、编解码器信息存储在文件中。用于制作工作流程的专业元数据。
有限的软件
很少有音乐库管理器能够很好地支持CAF标签。M4A/MP3的标签生态系统更好。实际限制。
iTunes集成
iTunes/Music应用程序处理CAF元数据。但CAF在iTunes库中并不常见 - M4A占主导地位。
转换保留
FFmpeg and quality converters transfer CAF metadata to M4A/MP3 during conversion. Tags migrate properly.
专业焦点
CAF元数据旨在用于制作（录音细节、处理历史）。较少关注消费者音乐标签。
推荐
对于音乐库，使用M4A - 更好的标签支持，更好的播放器集成。CAF仅用于制作。
Extensible System
CAF元数据是可扩展的 - 可以添加自定义字段。适用于专业应用。
实际情况
CAF在技术上支持元数据，但生态系统支持较差。M4A/FLAC更适合有组织的库。
为什么CAF不更受欢迎？
Apple-only: CAF works best on macOS/iOS. Other platforms have poor support. M4A (also Apple-developed) achieved cross-platform success because it's based on ISO standard (MPEG-4). CAF is Apple-proprietary without industry standardization.
M4A已经足够好：对于大多数用户而言，M4A与AAC能够满足他们的所有需求 - 良好的质量、合理的文件大小、广泛的兼容性。CAF的优势（巨大的文件、无限的通道、特殊的规格）仅对专业音频工程师重要。消费者市场不需要CAF。
网络效应：每个人都使用M4A/MP3，因此工具支持它们。CAF仍然是小众，因此软件支持是事后考虑。没有临界质量，格式无论技术上多么优秀都会失败。CAF在技术上优于许多替代品，但在社会上被拒绝。
我如何批量转换CAF文件？
FFmpeg batch - macOS/Linux: `for f in *.caf; do ffmpeg -i "$f" -codec:a aac -b:a 256k "${f%.caf}.m4a"; done`. Converts all CAF in folder to AAC M4A. Adjust bitrate and codec as needed.
Windows PowerShell: `Get-ChildItem -Filter *.caf | ForEach-Object { ffmpeg -i $_.Name -codec:a libmp3lame -q:a 2 "$($_.BaseName).mp3" }`. Batch converts CAF to MP3. Change codec/settings for M4A output.
macOS Automator：创建带有“编码媒体”操作的工作流。拖动CAF文件，选择输出格式，处理批量。无需命令行的原生macOS解决方案。适合对终端不熟悉的用户。
我什么时候应该实际使用CAF格式？
专业音频制作：在Logic Pro中录音/编辑，处理大型多轨项目，归档无压缩高分辨率音频，或使用不寻常的采样率。CAF满足标准格式难以处理的专业要求。
大文件录音：录制音乐会、全天活动或连续监控，文件超过4GB。CAF没有WAV/AIFF的大小限制。然而，RF64（扩展WAV）也解决了这个问题，并且具有更好的跨平台支持。
何时不使用：音乐库（使用M4A/FLAC）、便携设备（使用M4A/MP3）、共享文件（使用M4A/MP3）、网页播放（使用M4A/MP3）。CAF是专业制作格式，而不是消费者分发格式。制作工作完成后导出为标准格式。
我可以将CAF用于音乐库吗？
Technically yes, practically no. CAF works in iTunes/Music app on macOS/iOS. However: most music players outside Apple ecosystem don't support CAF, tagging software has poor CAF support, sharing libraries with others creates compatibility issues, cloud services don't recognize CAF, car stereos/smart speakers won't play CAF.
M4A is better choice for music libraries: Universal support (Apple devices + Windows + Android + web), excellent tagging ecosystem (Mp3tag, MusicBee work great), cloud-friendly (Google/Amazon/Spotify recognize M4A), portable device compatibility, and same AAC quality if using same bitrate.
将CAF用于制作，导出为M4A/FLAC以供库使用。如有需要，可在CAF中录音/编辑，但最终归档格式应为具有广泛兼容性和长期支持保证的格式。CAF是过渡格式，而不是归档格式。
CAF与M4A与WAV - 我该使用哪个？
Use CAF for: Professional audio production on Apple platforms (Logic Pro, large projects), recordings exceeding 4GB, unusual sample rates or channel configurations, or projects requiring maximum flexibility. CAF is professional tool for specialized needs.
使用M4A用于：音乐库、便携设备、共享文件、流媒体、云存储。M4A容器中的AAC在合理大小下提供出色的质量，具有通用兼容性。最适合消费者音乐收听和移动设备。
Use WAV for: Quick recording/editing, maximum compatibility (even better than M4A), archival of short recordings, or when you need absolutely universal format. WAV is uncompressed (large files) but works everywhere. For large files (>4GB), use RF64 (extended WAV), not WAV or CAF. Choose practically - CAF for Apple production, M4A for listening, WAV for compatibility.