Convert MPEG Audio Layer 1 (.mp1) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registration.
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Converting MP1 to AIFF decodes the compressed MPEG Audio Layer 1 bitstream and stores the resulting PCM audio in Apple's uncompressed AIFF format. This conversion is useful for editing MP1 audio in professional DAWs that work optimally with uncompressed formats, or for archiving decoded MP1 content in a lossless container.
MP1 was the first standardized perceptual audio codec (ISO 11172-3, 1993), using subband coding with 32 subbands. The decoded audio from MP1 contains compression artifacts from the original encoding — converting to AIFF preserves these artifacts as-is in an uncompressed container without adding any additional degradation.
DAWs like Logic Pro and Pro Tools work most efficiently with uncompressed AIFF for timeline editing, mixing, and processing. If you have MP1 audio from VCD archives or DAB recordings that needs professional editing, converting to AIFF provides an edit-friendly format.
AIFF also serves as a preservation format — once decoded to AIFF, the audio can be re-encoded to any other format without re-decoding MP1. This is useful when you need to create multiple output formats from a single MP1 source.
FFmpeg decodes the MP1 bitstream's 32-subband filter bank to reconstruct PCM samples, then writes the audio into an AIFF container with big-endian byte order. The output is typically 16-bit/44.1 kHz (matching CD quality). The decoded audio is limited to the quality of the MP1 source — no information is gained by expanding to uncompressed format. The AIFF file will be approximately 10-15x larger than the MP1 source at typical bitrates.
The AIFF output faithfully preserves whatever audio quality existed in the MP1 source — no quality is gained, but no additional quality is lost. MP1 at 384 kbps provides near-CD quality; MP1 at lower bitrates shows audible subband coding artifacts (pre-echo, bandwidth limiting). These artifacts are preserved as-is in the AIFF output.
| Device | MP1 | AIFF |
|---|---|---|
| Windows PC | Partial | Partial |
| 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
MP1 to AIFF extracts and preserves the decoded audio in an uncompressed editing format. The AIFF quality equals the MP1 source with no generation loss.
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| No |
| 特徴 | MP1 | AIFF |
|---|---|---|
| 正式名称 | MPEG Audio Layer 1 | Audio Interchange File Format |
| 拡張子 | .mp1 | .aiff |
| 最適な用途 | Early MPEG standard | Lossless quality |