VOB to M4A converter
Convert VOB to M4A in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.
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Related conversions
Convert other formats to M4A
Read more about the VOB format and the M4A format, or see every video tool and all video conversions.
Should you convert VOB to M4A?
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 M4A.
VOB is the MPEG-2 video files inside a DVD’s VIDEO_TS folder; M4A is AAC audio in an MP4 container, Apple’s everyday audio format. Use M4A for music and recordings on Apple devices, or anywhere AAC is accepted and size matters.
| Property | VOB | M4A |
|---|---|---|
| What it is | The MPEG-2 video files inside a DVD’s VIDEO_TS folder | AAC audio in an MP4 container, Apple’s everyday audio format |
| Audio inside | MPEG-2 video with AC-3 or MP2 audio | 128–256 kbps AAC |
| Plays on | DVD players and VLC; phones, browsers and editors mostly can’t | Apple devices, Android, browsers and most players; some older car stereos, Windows apps and forms refuse it |
| Best for | Playing a DVD structure as it was authored | Good-sounding audio at small sizes |
How to convert VOB to M4A
- 01
Add your VOB
Drop your VOB video onto the box, or click to choose it. It is read from your disk and stays there.
- 02
Check the settings
The output is already set to M4A. Change the bitrate if you want to; the defaults suit most files.
- 03
Save the M4A
Press convert and save the M4A. Several files come back together as a ZIP.
What changes when VOB becomes M4A
From AC-3 or MP2 to AAC
VOB soundtracks are usually AC-3 or MP2, so saving M4A 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.
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 VOB and M4A, 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 yourselfWorth knowing
- About the VOB. A film is spread across VTS_01_1.VOB, VTS_01_2.VOB and so on; converting one gives you one chunk of it. Commercial discs are usually copy-protected too.
- About the M4A. An .m4a can also hold lossless ALAC audio, several times larger; the extension alone doesn’t tell you which.
- AVI, WMV, FLV and other older formats use the FFmpeg engine, a one-time 31 MB download.
Questions
Does extracting M4A from a VOB lose quality?
The soundtrack is compressed again as M4A. 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 M4A.
Read more about this
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- Trim Video Cut the start and end off a clip without re-encoding it.