Convert MPEG Audio Layer 1 (.mp1) to Free Lossless Audio Codec (.flac) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .mp1 file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flac file when it's ready.
Converting MP1 to FLAC decodes the lossy MPEG Audio Layer 1 bitstream and stores the resulting PCM in a losslessly compressed container. FLAC preserves every sample of the decoded audio without adding any further degradation, while compressing the file to approximately 40-60% of uncompressed size.
This conversion is primarily archival — it captures the maximum quality recoverable from MP1 sources in an efficient lossless format. From FLAC, the audio can later be transcoded to any other format without re-decoding the original MP1 file.
When archiving MP1 content from VCD or DAB sources, FLAC provides the most space-efficient way to store the decoded audio without any additional quality loss. Unlike converting MP1 to another lossy format (MP3, AAC), FLAC to FLAC conversion guarantees that no further generation loss occurs.
FLAC's rich Vorbis comment metadata system also allows proper cataloging of the archived content — something MP1's minimal header does not support. Adding artist, title, source, and date tags during conversion creates a well-organized archive.
FFmpeg decodes the MP1 subband audio (32-subband filter bank) to PCM at the original sample rate (typically 44.1 kHz for VCD sources), then encodes the PCM to FLAC using linear prediction and residual coding. FLAC compression level 5 (default) provides good compression speed. The decoded-then-compressed file is typically 3-5x larger than the MP1 source because FLAC losslessly stores the full decoded PCM bandwidth.
FLAC output is lossless relative to the MP1 decoded audio — every decoded PCM sample is preserved without modification. The audio quality is limited by the original MP1 encoding, not by the FLAC container. This is the maximum quality extractable from an MP1 source, stored in the most space-efficient lossless format.
| Device | MP1 | FLAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| 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 FLAC provides optimal archival of decoded legacy audio. FLAC preserves the maximum quality recoverable from MP1 with efficient lossless compression.
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| No |
| Jellemzo | MP1 | FLAC |
|---|---|---|
| Teljes nev | MPEG Audio Layer 1 | Free Lossless Audio Codec |
| Kiterjesztes | .mp1 | .flac |
| Leginkabb ajanlott | Early MPEG standard | Lossless compression |