CAVS to PVF Converter

Extract audio from CAVS and save as PVF online for free

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

No Software Needed

Extract PVF audio from CAVS video entirely in your browser. Works on any device — phone, tablet, laptop, or desktop.

Private and Secure

Uploaded files are deleted right after processing, and converted results are removed within 24 hours. Your content stays protected.

Any Device Works

Desktop, laptop, tablet, or smartphone — the converter adapts to your screen and works in any modern web browser.

How to convert CAVS to PVF

1

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

2

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

3

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

About formats

CAVS (Chinese Audio Video Standard) is a video compression standard developed by the Audio Video Coding Standard Workgroup of China and adopted as a national standard (GB/T 20090.2) in February 2006. The project began in 2002 with the aim of creating an independent compression technology that could serve the massive broadcasting and multimedia infrastructure in China without relying on foreign-licensed codecs. CAVS, also referred to as AVS1, achieves compression efficiency comparable to H.264/AVC while utilizing a simpler patent framework with significantly lower licensing costs. The standard supports video resolutions from standard definition up to high definition, making it suitable for both terrestrial digital television broadcasting and broadband streaming. Key technical features include 8x8 block transforms, multiple prediction modes, and a loop filter designed to reduce blocking artifacts at low bit rates. The Chinese government endorsed CAVS as the mandatory compression standard for the national digital TV broadcasting system, ensuring broad deployment across set-top boxes and television receivers in the country. While CAVS has limited international adoption compared to H.264 or HEVC, its significance lies in serving one of the largest media markets in the world and demonstrating a viable national alternative to globally dominant video coding standards.
Initial release: February 2006
PVF (Portable Voice Format) is a simple audio file format designed for voice message storage in Linux-based telephony systems, most notably ISDN4Linux and its vbox voicemail application. The format emerged from the European ISDN ecosystem of the late 1990s, when Linux servers increasingly handled PBX and answering machine duties over digital phone lines. PVF files store raw signed 16-bit PCM samples at 8000 Hz mono, preceded by a minimal plain-text header specifying data format and byte ordering. This deliberate simplicity is one of the format's primary strengths — with no compression and a human-readable header, PVF files are trivially easy to parse, pipe, and manipulate using standard Unix tools. The 8 kHz rate matches the Nyquist requirement for telephone-bandwidth speech (300-3400 Hz), making PVF a natural intermediate format for voice processing pipelines. Another advantage is cross-architecture portability: the explicit byte-order declaration means PVF files move between big-endian and little-endian systems without ambiguity. The SoX audio toolkit provides native PVF read/write support, enabling straightforward conversion to modern formats.
Developer: ISDN4Linux Project
Initial release: 1997

Frequently Asked Questions

Why should I convert CAVS to PVF?

If you only need the audio from a CAVS recording, converting to PVF strips the video and produces a lightweight audio file.

What program opens PVF files?

Specialized telephony and voice processing tools can work with Portable Voice Format files.

Do I need to install anything?

Not at all. The converter runs in your web browser — no downloads, plugins, or desktop applications are required for the conversion.

Does it work on phones and tablets?

Yes. The converter runs in any modern mobile browser on iOS and Android devices, with the same functionality as desktop.

What happens to my uploaded files?

Uploaded CAVS files are deleted from our servers immediately after processing. Converted PVF files are auto-removed within 24 hours.

Can I convert several files at once?

Yes. Upload multiple CAVS files and extract PVF audio from each one in a single batch operation — fast and convenient.