Convert AVCHD Video (.mts) to Free Lossless Audio Codec (.flac) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .mts 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.
AVCHD camcorders record audio as either AC3 (Dolby Digital) at 256-640 kbps or LPCM at 1536 kbps — both substantially higher quality than typical consumer audio recordings. FLAC (Free Lossless Audio Codec) compresses audio by 30-50% without losing a single sample. Converting MTS to FLAC extracts the camcorder's high-quality audio track into a compact lossless format suitable for archiving, editing, and cross-platform distribution.
Camcorder audio often contains irreplaceable recordings — wedding ceremonies, live performances, family milestones, nature soundscapes. FLAC provides the safest archival format because it is lossless (no degradation over any number of accesses), open-source (no vendor lock-in), and compressed (half the size of WAV/AIFF). Unlike AAC or MP3, FLAC guarantees that every future use of the audio starts from the best possible quality.
FLAC is also the preferred format for music archives, radio stations, and institutional sound collections. The format's built-in integrity checking (MD5 fingerprint) ensures that stored files have not been corrupted — an essential feature for long-term audio preservation.
FFmpeg discards video and encodes audio to FLAC: `-vn -c:a flac -compression_level 8 -ar 48000 -ac 2`. For 5.1 AC3 sources, FLAC supports up to 8 channels: `-ac 6` preserves all surround channels. FLAC compression levels (0-12) affect only encoding speed — decoded quality is identical at all levels. Level 8 provides good compression with reasonable encoding speed.
FLAC is mathematically lossless. If the MTS contains LPCM audio, the FLAC file is a bit-perfect compressed copy. If the source is AC3, the decoded AC3 audio is preserved exactly in FLAC without any further loss. File sizes are roughly 15-20 MB per minute for stereo 48 kHz content.
| Device | MTS | FLAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
MTS to FLAC conversion preserves camcorder audio in the best possible format for long-term archival — lossless, open-source, and compact enough for practical storage of large recording collections.
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| No |
ทุกเบราว์เซอร์ ทุกอุปกรณ์
| ฟีเจอร์ | MTS | FLAC |
|---|---|---|
| ชื่อเต็ม | AVCHD Video | Free Lossless Audio Codec |
| นามสกุล | .mts | .flac |
| เหมาะที่สุดสำหรับ | HD camcorders | Lossless compression |