Convert any video file to M4A format online for free. Fast, secure, and easy-to-use video to M4A converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your VOB file, or click to browse for it.
Choose M4A as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
Works directly in your web browser. No software download or installation required.
How the two formats differ on the things that change your result.
| Specification | VOB (source) | M4A (result) |
|---|---|---|
| Container | DVD-Video (MPEG-2 PS) | MPEG-4 Part 14 |
| Developed by | DVD Forum | Apple / MPEG |
| Introduced | 1996 | 2003 |
| Audio codecs | AC-3, DTS, LPCM, MP2 | AAC-LC, HE-AAC, ALAC |
| Compression | Depends on codec | Depends on codec |
| Approx. file size | 30–68 MB per minute | 0.72–1.92 MB per minute |
| Metadata / tags | Container tags | MPEG-4 iTunes-style atoms |
| Licensing | Patents expired | Patent-licensed |
| Plays natively on | Needs a player: macOS, Android, Windows | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs |
| Best for | DVD archives, home theatre, legacy archives | the Apple ecosystem, music libraries, audiobooks |
This extracts the audio and discards the video entirely. The soundtrack inside a VOB file is typically AC-3, and it is re-encoded to AAC-LC on the way out.
Expect a much smaller file. Video accounts for most of the bytes, so about 49 MB per minute becomes roughly 1.3 MB per minute of M4A.
Subtitles do not survive audio extraction, since an audio container has nowhere to store them.
When a video holds several audio tracks, the main one is extracted; alternate language tracks are not merged into the result.
Extracting M4A audio from a VOB video pulls the soundtrack out of the DVD-Video (MPEG-2 PS) container and writes it as a standalone MPEG-4 Part 14 file. The video stream, which holds most of the data, is discarded.
Developed by DVD Forum in 1996, VOB carries MPEG-2 video and AC-3, DTS, LPCM, or MP2 audio. That combination sets the upper bound on what any conversion can preserve.
M4A was introduced by Apple / MPEG in 2003. It holds audio in whichever codec it was encoded with (AAC-LC, HE-AAC, or ALAC) and plays natively on web browsers, Windows, macOS, iOS, Android, and smart TVs.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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