M4V to FLAC Converter

MPEG-4 Video (M4V) is a container video format used for itunes purchases, apple device playback and h.264 exports from phones. Files saved as M4V usually come from Apple / MPEG. Before converting, check that the source is the highest-quality copy you have, because every later step can only preserve what is already there.

The target is Free Lossless Audio Codec (FLAC), a lossless audio format chosen for archiving music without sacrificing cd-quality data. The video track is discarded and only the audio stream is decoded, re-encoded and packaged in the target container. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

FLAC stores the decoded samples losslessly, typically at 50–60% of the WAV size. It is the archival choice when the source is already lossless. Only the audio stream is decoded; video tracks, chapter markers and subtitles in the source are dropped from the output. Expect a smaller output file, which is usually the reason to pick FLAC.

This conversion runs locally in your browser tab through Canvas or FFmpeg.wasm. The file is read from your device, decoded, re-encoded and handed back as a download; it is not uploaded to a conversion server. That keeps private recordings, client material and unreleased artwork off shared infrastructure.

After the download, play or open the result before deleting the original. Check the first and last seconds, confirm that transparency, rotation metadata or sample rate survived, and compare file sizes. If something looks wrong, retry with a higher quality setting rather than converting the output again.