MP4 to DVMS Converter

Extract DVMS voice audio from MP4 video files online

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Voicemail Format

DVMS serves telephony voicemail systems. Converting MP4 audio to DVMS creates files compatible with these specialized platforms.

Compact Voice Files

DVMS encoding produces small voice recordings from your MP4 — suited for voicemail storage and telephony delivery.

Secure Processing

Your uploaded MP4 is deleted right after conversion. DVMS results are removed from our servers within 24 hours.

How to convert MP4 to DVMS

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose dvms or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your dvms file right afterwards

About formats

MP4 (MPEG-4 Part 14) is the most widely used multimedia container format in the world, standardized by the Moving Picture Experts Group as part of the MPEG-4 specification in 2003. Built on the ISO base media file format (MPEG-4 Part 12), which itself drew from the Apple QuickTime container, MP4 uses a hierarchical atom/box structure that can encapsulate virtually any type of media data. The container most commonly packages H.264 or H.265 video with AAC audio, though it also supports a wide range of alternative codecs including AV1, VP9, MPEG-4 Visual, AC-3, and ALAC. The design supports advanced features such as streaming hints for progressive download and adaptive streaming, chapter markers, multiple audio and subtitle tracks, metadata tags, and embedded thumbnail images. A standardized structure and broad codec support have made MP4 the default choice for online video platforms, mobile devices, digital cameras, and operating system media libraries. HTML5 video with H.264 in MP4 is supported by every major web browser, establishing the combination as the universal baseline for web video delivery. Efficient packaging overhead, combined with the compression capabilities of modern codecs it carries, enables high-quality video distribution at practical file sizes across bandwidth-constrained networks and storage-limited devices.
Initial release: 2003
DVMS (Dutch Voice Messaging System) is a telephony-grade audio encoding born from the Netherlands' early push toward digital voicemail infrastructure. Deployed through KPN (formerly PTT Telecom) in the mid-1980s, the format stores mono voice data at a narrow 8 kHz sample rate, prioritizing compact message size over sonic breadth. Audio is compressed with a proprietary variant of logarithmic companding similar to European A-law encoding, squeezing recordings to roughly 8 kbit/s while keeping speech intelligible. Each file carries a small header identifying sample rate, compression type, and message metadata, which made automated routing across early PBX and voicemail systems straightforward. Although DVMS never gained traction outside Dutch telecom circles, it influenced how European carriers designed later voice messaging protocols. Tools like SoX and several legacy telephony libraries still read and write DVMS files, allowing archival playback of decades-old messages. Among its practical advantages: extremely small file sizes (a one-minute message occupies roughly 60 KB), reliable speech clarity despite aggressive compression, and a simple container layout that is easy to parse programmatically.
Developer: Dutch PTT Telecom
Initial release: 1984

Frequently Asked Questions

Why convert MP4 to DVMS?

DVMS is a voice messaging format used in specific telephony and voicemail systems. Converting provides audio compatible with these specialized platforms.

What opens DVMS files?

SoX and specialized voicemail system software handle DVMS files. The format is designed for telephony infrastructure rather than consumer playback.

Is DVMS for voice only?

Yes — DVMS is tailored for voice messaging systems. It is not intended for music or general-purpose audio playback.

Can I convert several files?

Upload multiple MP4 videos at once. Each audio track is extracted to a separate DVMS file in parallel.

How compact are DVMS files?

DVMS produces small voice files suited to the storage constraints of telephony hardware and voicemail systems.

Does it remove the video?

Yes — only the audio is extracted from your MP4 video. The result is a pure DVMS voice audio file.

MP4 to DVMS Quality Rating

4.9 (14 votes)
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