什么是 MPGA 文件？
MPEG 音频流，与 MP3 相似
MPGA files, also known as MPEG-1 Layer 3 Audio files, are the audio tracks usually found embedded in MPEG-based videos and streaming files. Most MPGA files are encoded with the same compression algorithm as MP3 files. Thus, any media player that can handle MP3 files can also decode MPGA files. MPGA files are compressed audio filesand takes up less space when compared to WAV files. MPGA files are also commonly used in police investigations or for recording interviews. Since MPGA files are compressed, it is more difficult to tamper with the underlying audio because a user would have to decode the MPGA file to a more editable format and then re-encode the file, which would also inadvertently overwrite most of the file’s meta data. MPGA files are a widely accessible file format.
MPGA 文件的常见用途
- 视频文件中的音频
- 采访录音
- 证据保存
- 视频解复用
- 录音设备
- 法律/调查录音
谁会使用 MPGA 文件？
视频编辑和后期制作团队在从 MPEG 视频项目中分离音轨时会遇到 MPGA 文件，处理旧广播素材的数字档案管理员也常以这种格式管理音频。处理旧现场录音的记者和研究人员，也可能从硬件录音机和媒体转换工具收到带 .mpga 扩展名的文件。
MPGA 与 MP3：应该选择哪一个？
MPGA 和 MP3 文件通常包含相同的 MPEG-1 Audio Layer III 数据；区别主要在于文件扩展名的约定，而非编码本身。.mpga 扩展名最常用于标记从 MPEG 视频中解复用出来的音频流，而 .mp3 是独立音频文件的标准扩展名，享有近乎通用的播放器和设备支持。广泛分享文件时请选择 MP3，因为有些软件尽管能解码音频，却不识别 .mpga 扩展名。
将 MP3 转换为文字