Convert M4V to AAC — Free Online Converter

M4V files from Apple's ecosystem store H.264 video alongside AAC audio tracks, often from iTunes purchases or Apple TV content. Converting M4V to AAC extracts just the audio layer, discarding the video entirely. Since M4V already uses AAC for its audio codec, this process can often perform a direct stream copy — pulling the AAC data out of the MPEG-4 container without re-encoding, preserving the exact original audio quality at zero computational cost.

Extracting AAC audio from M4V is ideal when you only need the soundtrack, dialogue, or music from a video file. AAC is universally supported across all Apple devices, Android, web browsers, and most media players. Since M4V already contains AAC audio natively, the extraction is lossless when using stream copy — you get the exact audio quality that was mastered into the original video.

FFmpeg reads the M4V container and isolates the AAC audio stream using -vn (no video) and -acodec copy for lossless extraction. This is a remux operation, not a transcode — the AAC bitstream is copied byte-for-byte into a standalone .aac or .m4a container. If re-encoding is requested (e.g., to change the bitrate), FFmpeg decodes the AAC and re-encodes it at the target bitrate using the native AAC encoder or libfdk_aac.