Convert AVI to FLAC — Free Online Converter

AVI's RIFF structure commonly wraps audio encoded as uncompressed PCM (16/24-bit), MPEG Layer 3 (MP3), or Dolby AC3. FLAC (Free Lossless Audio Codec) is the open-source standard for lossless audio compression, achieving 50–70% size reduction compared to raw PCM while guaranteeing bit-perfect reconstruction. Converting AVI to FLAC extracts the audio track and compresses it losslessly, producing a standalone audio file widely supported on Linux, Android, Windows, and most modern audio equipment.

FLAC is the preferred lossless format for audiophiles, music archivists, and open-source enthusiasts. When extracting audio from AVI files — live recordings, music videos, or film audio — FLAC preserves every detail while being roughly half the size of the equivalent WAV or AIFF. Unlike ALAC (Apple-only ecosystem), FLAC enjoys universal support across platforms, media servers (Plex, Jellyfin), and high-fidelity audio players (foobar2000, DeaDBeeF, Roon).

FFmpeg demuxes the AVI container, decodes the audio stream to PCM, and re-encodes to FLAC at the selected compression level (0–8, where 8 is maximum compression at the cost of encoding speed). FLAC compression is always lossless regardless of level — only encoding time and file size differ. The output preserves the original sample rate (44.1/48/96 kHz), bit depth (16/24-bit), and channel count. FLAC also supports embedded cover art, Vorbis comments, and cue sheet metadata.