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M4V to OPUS converter

Convert M4V to OPUS in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.

I want OPUS
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Other ways to convert M4V

Convert other formats to OPUS

Read more about the M4V format and the OPUS format, or see every video tool and all video conversions.

Should you convert M4V to OPUS?

Yes, when you only need the sound: a song from a music video, the audio of a lecture, or a voice recording to transcribe. The picture is left out and the soundtrack is saved as OPUS.

M4V is an MP4 video with Apple’s extension; OPUS is the most efficient audio codec in common use, especially for speech. Use Opus for speech and streaming where small size matters more than compatibility.

M4V and OPUS compared
Property M4V OPUS
What it is An MP4 video with Apple’s extension The most efficient audio codec in common use, especially for speech
Audio inside H.264 video with AAC audio 24–128 kbps
Plays on Apple apps and VLC; some Windows apps and upload forms reject the extension Browsers, Android and chat apps; many media players, editors and forms can’t open .opus files
Best for Apple TV and iTunes libraries Voice notes, calls and streaming at low bitrates

How to convert M4V to OPUS

  1. 01

    Add your M4V

    Drop your M4V video onto the box, or click to choose it. It is read from your disk and stays there.

  2. 02

    Check the settings

    The output is already set to OPUS. Change the bitrate if you want to; the defaults suit most files.

  3. 03

    Save the OPUS

    Press convert and save the OPUS. Several files come back together as a ZIP.

What changes when M4V becomes OPUS

From AAC to Opus

M4V soundtracks are usually AAC, so saving OPUS is one more lossy step. 192 kbps suits music, 128 kbps is plenty for speech, and going above the original bitrate only makes the file bigger.

Ideal for speech

Opus sounds clear at very low bitrates, which makes it the smallest option for lectures, meetings and interviews.

Video files without sound

Screen recordings and some exported clips have no audio track at all. The file is checked as soon as you add it, and you’ll be told before converting if there’s nothing to extract.

This page is put together from our notes on each format, choosing only what is true of M4V and OPUS, so every pairing states the same facts the same way. How these pages are made.

Why it doesn’t upload

Uploading a whole video to keep only its sound wastes time and data, and hands over the footage too. The audio track is read and saved right here, and the file never leaves your device.

How to check for yourself

Worth knowing

  • About the M4V. Films bought from the iTunes Store are copy-protected and can’t be converted by any tool; your own M4V exports convert in seconds.
  • About the OPUS. WhatsApp voice notes exported from a phone are Opus files, sometimes named .ogg, which many players and transcription services refuse.
  • AVI, WMV, FLV and other older formats use the FFmpeg engine, a one-time 31 MB download.

Questions

Does extracting OPUS from an M4V lose quality?

The soundtrack is compressed again as OPUS. At 192 kbps the difference from the original is inaudible for nearly everyone.

Can I get the audio from only part of the video?

Yes. Set a start and end time before converting, and only that section is saved as OPUS.

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