Convert Standard MIDI (.mid) to Audio Video Interleave (.avi) online for free. Fast, secure audio conversion with no watermarks or registration.
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MID (Standard MIDI File) stores musical performance as structured data — note events, velocity, timing, and instrument assignments — without any audio waveforms. Developed by the MIDI Manufacturers Association in 1983, MIDI is the universal protocol for electronic music. Files are minuscule (10-100 KB) because they contain instructions, not sound.
AVI (Audio Video Interleave) is Microsoft's legacy multimedia container supporting interleaved audio and video streams. Converting MID to AVI renders the MIDI performance through a software synthesizer and packages the resulting audio into an AVI container. Since MIDI has no visual component, the output is an audio-only AVI file — an uncommon format typically used for compatibility with legacy Windows applications that require AVI input.
Some legacy Windows multimedia applications, video editors, and presentation tools only accept AVI files as input. If you need to include rendered MIDI music in these workflows, converting to AVI provides a compatible container. The AVI format also supports embedding audio alongside video, so the rendered MIDI can serve as a soundtrack placeholder in video editing timelines.
AVI is also useful for archival compatibility with older Windows systems that lack modern codec support. Wrapping MIDI-rendered audio in an AVI container with PCM or MP3 audio ensures playback on virtually any Windows machine from the past 25 years.
FFmpeg decodes the MIDI file using its built-in MIDI decoder and software synthesizer, rendering all MIDI channels to a stereo PCM audio stream. Since MIDI has no visual data, a dummy video stream is not generated — the AVI container holds audio only. The audio is encoded as PCM (uncompressed), MP3, or another codec supported by AVI. The RIFF-based AVI container wraps the audio stream with proper interleave headers and index chunks for seekability.
Quality depends primarily on the SoundFont used for synthesis, not the AVI container. AVI supports uncompressed PCM audio, so the container itself introduces no degradation when PCM is chosen. If MP3 encoding is used within AVI, standard lossy compression applies. The SoundFont quality determines the musical realism — a large multi-sampled bank produces natural timbres, while the default GM bank sounds mechanical.
| Device | MID | AVI |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
MID to AVI renders MIDI instructions into a legacy Windows multimedia container. The format is niche but necessary for specific legacy software compatibility requirements.
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| No |
| Tính năng | MID | AVI |
|---|---|---|
| Tên đầy đủ | Standard MIDI File | Audio Video Interleave |
| Phần mở rộng | .mid | .avi |
| Phù hợp nhất cho | Musical performance data | Windows native |