MPEG 4 Video Files to VOX conversion is the process of extracting or encoding audio data from an MP4 video container into the VOX format, a low-bitrate ADPCM-based voice file typically used for telephony and embedded systems. This conversion transforms the multimedia MP4 (which may contain H.264 video and AAC/MP3 audio) into a compact, mono VOX audio file suitable for voice prompts, IVR systems, and other low-bandwidth voice applications.
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Drag your .MP4 file from your computer or use the browse function.
Confirm .vox as the selected destination format.
Click "Convert" and download your converted .VOX file once ready.
MP4 files use the MIME type video/mp4 and commonly employ codecs like H.264 for video and AAC for audio. VOX files use the audio/vox MIME type and typically store audio in Dialogic ADPCM format. MP4 is widely used for streaming and playback, whereas VOX is mostly used in telephony and voice messaging systems.
The VOX (.VOX) format is commonly used for video. Understanding its characteristics can be helpful when converting to or from other formats like MPEG 4 Video Files.
While specific technical details aren't available here, VOX files generally serve the purpose of storing video effectively within their domain.
Our Online MP4 to VOX Converter allows you to seamlessly convert MPEG 4 Video Files (MP4) into VOX audio format without any software installation. Designed for ease of use and speed, this tool ensures your MP4 files are converted with excellent quality directly in your browser.
MPEG 4 Video Files (MP4) are multimedia containers that store video, audio, and subtitles, commonly used for playback on modern devices. VOX files are audio-only, typically used for voice data in telephony with smaller file sizes and limited audio quality. While MP4 supports rich media content, VOX is optimized for simple, compressed voice recordings.
Keep source MP4 audio mono or convert stereo to mono before conversion to preserve compatibility with VOX’s mono-only format and reduce artifacts.
For best intelligibility, use 8 kHz sample rate and ADPCM (IMA/DVI) encoding — higher sample rates are rarely supported by VOX players.
Optimal file size: aim for short clips (under 1–2 MB after VOX conversion for typical voice prompts); long recordings can balloon when using higher bit-depths.
Batch convert by ensuring consistent audio properties (sample rate, channels) across files; normalize levels first to avoid clipping after ADPCM compression.
The online MP4 to VOX converter saved me time and preserved audio quality.
James L.
Developer
Quick and reliable conversion from video to voice format, exactly what I needed.
Emma R.
Audio Engineer
Perfect tool to prepare voice files compatible with our telephony system.
Carlos M.
Call Center Manager
Start your free MP4 to VOX conversion now.
Drag your file here to to upload.
Up to 250MB
Format limitation: VOX is designed for low-fidelity voice; you will lose stereo, high-frequency detail, and music fidelity when converting from MP4.