RMVB to DVMS Converter

Extract DVMS voice messaging from RealMedia RMVB video

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Specialized Format

DVMS serves voicemail systems — extract compatible audio directly from RealMedia RMVB video.

Cloud Processing

No specialized software needed. Extract DVMS from RMVB entirely through your browser.

Secure Handling

RMVB uploads are deleted after extraction. DVMS files are removed within 24 hours.

How to convert RMVB 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

RMVB (RealMedia Variable Bitrate) is an enhanced version of the RealMedia container format developed by RealNetworks, introduced around 2003. While the original RM format used constant bit rate encoding, RMVB employs variable bit rate compression that dynamically allocates more data to complex scenes with high motion and detail, and fewer bits to simpler passages like static shots or fade transitions. This approach yields significantly better visual quality at equivalent average file sizes compared to the constant bit rate predecessor. RMVB gained particular popularity in East and Southeast Asian markets during the mid-2000s, becoming a widely used format for distributing full-length movies and television content in regions where bandwidth was limited but viewers still demanded reasonable picture quality. The format typically uses RealVideo 9 or RealVideo 10 codecs, which drew on technologies comparable to H.264 in their compression approach. RMVB files support embedded subtitle streams and multiple audio tracks, making them practical for multilingual content distribution. The container retains the streaming-friendly architecture of RealMedia while delivering the quality improvements that variable bit rate encoding provides. Although RMVB has been superseded by MP4 with H.264 and other modern formats for most purposes, it retains a user base in Asian markets and can still be found in online media archives and personal video collections from the mid-2000s era.
Developer: RealNetworks
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 extract DVMS from RMVB?

DVMS is used for voicemail systems. Extracting from RMVB provides audio in this specialized format.

What software handles DVMS?

SOX and specialized audio tools support DVMS for processing, playback, and conversion.

Is DVMS widely used?

DVMS serves specific voicemail systems needs — a niche but important format for its target applications.

Will audio quality transfer?

Audio from your RMVB video is accurately converted into DVMS format during extraction.

Can I batch extract?

Upload multiple RMVB files and extract DVMS audio from each simultaneously.