DivX to VOX Converter

Extract DivX video audio as Dialogic VOX ADPCM online

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Video to Phone Audio

Extract voice content from DivX and encode as VOX — the standard format for Dialogic IVR systems and telephony voice prompts.

Highly Compressed

VOX ADPCM keeps audio files tiny at 4 bits per sample. Ideal for telephony systems where storage per prompt must stay minimal.

Server-Based Encoding

All audio extraction and VOX encoding runs on our servers. Upload your DivX, download VOX — zero local tools required.

How to convert DIVX to VOX

1

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

2

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

3

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

About formats

DivX is a family of video codecs and a media container format developed by DivX, LLC. The project traces its roots to a hacked version of the Microsoft MPEG-4 v3 codec that circulated in the late 1990s, but the legitimate DivX codec launched in January 2001 as an open-source project called OpenDivX before transitioning to a proprietary commercial product. The codec is based on MPEG-4 Part 2 (ASP) compression and later versions incorporated H.264/AVC and HEVC support. DivX gained enormous popularity in the early 2000s for its ability to compress a full-length movie into a file small enough to fit on a single CD-ROM while maintaining watchable visual quality. This compression efficiency made DivX a defining format of the early internet era, when bandwidth and storage were scarce resources. The DivX Media Format (.divx) container adds features like interactive menus, chapters, subtitles, and alternate audio tracks, bringing DVD-like functionality to digital files. DivX certification became a common label on consumer electronics, with thousands of DVD players and other devices supporting DivX playback natively. The codec also pioneered quality-based variable bit rate encoding that allocates more data to complex scenes and less to static ones, resulting in consistent visual quality throughout a video.
Developer: DivX, LLC
Initial release: January 15, 2001
VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus), vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983

Frequently Asked Questions

Why convert DivX to VOX?

VOX is the go-to format for Dialogic telephony hardware and IVR systems. Converting DivX audio to VOX builds phone system prompts from video.

How small are VOX files?

VOX packs audio into 4-bit ADPCM, achieving roughly 4:1 compression versus raw PCM. This makes telephony storage very space-efficient.

Does VOX have a file header?

No — VOX is a headerless raw ADPCM format. Playback systems need to know the sample rate (usually 8kHz) when loading VOX files.

Is VOX suitable for music?

VOX is optimized for speech in telephony settings. Music quality is noticeably degraded — use MP3 or FLAC for music preservation.

Can I batch-convert many DivX files?

Yes — upload multiple DivX videos and convert them to VOX simultaneously. Efficient for creating libraries of telephony voice prompts.