M4V to OPUS Converter

Extract Opus Audio from M4V Online

M4V is Apple's MPEG-4 video container — the format iTunes movies, TV episodes, and personal exports use — and inside it sits an AAC audio track next to the H.264 video. This tool pulls the audio out of that file and re-encodes it as Opus, the open IETF codec (RFC 6716) behind Discord, WhatsApp, and WebRTC voice. The video is discarded, so you get sound only — and because Opus stays clear at low bitrates, a clip of dialogue or a soundtrack lands at a fraction of the size an MP3 would take. One honest caveat up front: if your M4V is a movie or show purchased or rented from the iTunes Store, it is almost certainly wrapped in Apple's FairPlay copy protection and cannot be converted — only DRM-free M4V works (see the FAQ).

How to Convert M4V to Opus

1. Upload Your M4V File: Drag and drop your .m4v (or .mp4) file onto the page or click "+ Add Files" to browse. Several files queue and convert with the same settings.
2. Set the Quality Preset: Open the options and pick a Quality Preset (the default is "Highest"), or switch to a Constant, Variable, or Custom Bitrate to name an exact kbps target — 24–48 kbps is plenty for voice, 96–128 kbps is transparent for music.
3. Adjust Audio Channel, Sample Rate, or Trim (optional): Leave Audio Channel and Audio Sample Rate on the original values, downmix to Mono to halve a voice file, or use Trim to keep only the segment you need.
4. Convert and Download: Click "Convert" and download your .opus file. No sign-up, no watermark.

Opus Bitrate Guide for Extracted M4V Audio

Frequently Asked Questions

Can I convert a DRM-protected iTunes M4V to Opus?

No. Movies and TV shows purchased or rented from the iTunes Store are usually wrapped in Apple's FairPlay copy protection, which restricts playback to devices authorized with the purchasing Apple account. A FairPlay-protected M4V cannot be decoded by a converter, so the extraction will fail. Only DRM-free M4V files — your own screen recordings, exports, camera footage, or downloads that were never encrypted — can be converted to Opus. This is a limitation of the protection on the file, not of the tool.

Does converting M4V to Opus keep the video?

No. Opus is an audio-only codec, so the H.264 video in your M4V is dropped and only the soundtrack is saved as a .opus file. That is the purpose of this tool — lifting a song, dialogue, a lecture, or ambient sound off a video. If you want to keep the picture and only change the container, convert to a video format with M4V to MP4 instead.

Will extracting Opus from an M4V lose audio quality?

Yes, a little — this is a re-encode, not a copy. The audio inside an M4V is AAC, which is already lossy, and Opus is also lossy, so the track is decoded from AAC and re-compressed as Opus. Each lossy pass discards a little more detail, and the second pass cannot rebuild what the first one removed. Opus is efficient enough that at 96–128 kbps the result is transparent to almost everyone; the loss only matters if you re-edit and re-export many times. To keep loss small, match or exceed the source bitrate rather than going lower. In our testing, a 60-second stereo AAC track from an M4V extracted at 96 kbps Opus came out near 0.7 MB.

Will my Opus file play everywhere?

Not quite. Opus plays natively in Chrome, Firefox, Edge, and Opera, on Android, in apps like VLC and Discord, and in Safari on recent Apple systems. The weak spots are older car stereos, legacy portable players, the iTunes/Music app on Apple platforms (no native Opus support), and Windows versions before 10 (which need a decoder such as LAV Filters). If you need maximum playback compatibility, convert M4V to MP3 instead, or — since the M4V audio is already AAC — extract to M4A for a lighter same-family re-encode that plays cleanly on Apple devices.

How are my files handled, and is there a size limit?

Your M4V is uploaded over an encrypted connection, processed on our servers, and the files are deleted automatically a few hours after the conversion — no sign-up, no watermark, never shared or made public. The main practical limit is upload size and time: M4V files carry full video, so a long clip may take a while to upload even though the .opus you get back is small. To keep just a section, set a Trim start and duration, or run the result through the Audio Cutter afterward.