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MIDI (Musical Instrument Digital Interface) is a format that records musical performance instructions, widely used in electronic music production, arrangement, and music education. MIDI files do not contain audio data but are converted to actual audio using soundfont libraries (e.g., FluidSynth). Supports multi-format conversion via FFmpeg. Audio-to-MIDI requires pitch detection tools for music production and arrangement. MIDI files are small in size, easy to edit, and suitable for music creation and real-time performance.

• 开发团队： MIDI Manufacturers Association
• 首发时间： 1983
• 相关链接：
https://www.midi.org/specifications https://github.com/FluidSynth/fluidsynth https://ffmpeg.org/ffmpeg-filters.html#midi https://www.celemony.com/en/melodyne/what-is-melodyne

AAC (Advanced Audio Codec) is a more efficient audio compression format than MP3, offering better sound quality while taking up less storage. It is widely used in streaming, Apple devices, and mobile platforms. AAC supports multiple profiles, making it suitable for various applications, including low-bitrate audio transmission and high-fidelity audio playback.

• 开发团队： Fraunhofer IIS, Dolby, Sony, Nokia
• 首发时间： 1997
• 相关链接：
https://en.wikipedia.org/wiki/Advanced_Audio_Codec https://www.videolan.org/vlc/index.html https://ffmpeg.org/