Convert M4V to FLAC — Free Online Converter

M4V files from Apple's ecosystem contain H.264 video with AAC audio, typically from iTunes purchases or Apple TV recordings. FLAC (Free Lossless Audio Codec) is an open-source lossless audio compression format that achieves 50-70% compression while guaranteeing bit-perfect audio reconstruction. Converting M4V to FLAC extracts the audio and encodes it losslessly, producing files that are significantly smaller than WAV or AIFF while preserving every sample of the decoded audio.

FLAC is the universal standard for lossless audio archiving, supported by virtually every platform except Apple's default apps (though Apple added FLAC playback in iOS 11 and macOS High Sierra). If you need to extract audio from M4V files for archiving, editing, or high-fidelity playback on non-Apple systems, FLAC provides the best combination of lossless quality, compression efficiency, and cross-platform support.

FFmpeg decodes the AAC audio from the M4V container into raw PCM samples, then encodes them with the FLAC encoder at a configurable compression level (0-12, where higher numbers mean smaller files but slower encoding). The output is a standalone FLAC file with Vorbis comment metadata support. FLAC typically achieves 50-70% of the original PCM size — so a 100 MB WAV equivalent becomes 30-50 MB in FLAC with zero quality loss.