CAVS to WAV Converter

Convert CAVS to WAV: What This Tool Actually Does

A .cavs file is a raw AVS1 video elementary stream — China's Audio Video Coding Standard, adopted as national standard GB/T 20090.2 in 2006. This converter pulls any audio that travels with that video and writes it out as an uncompressed WAV. The important caveat up front: a bare .cavs stream is video-only, so the WAV is only useful when your source carries a separate audio track (read the Common Errors section before you start).

How to Convert CAVS to WAV

1. Upload Your CAVS File: Drag and drop your .cavs file onto the page or click "Add Files". You can queue several files and convert them with the same settings.
2. Set the Audio Sample Rate: Leave it on "Original" to keep the source rate, or pick a standard rate such as 44100 Hz or 48000 Hz if you need a specific one for editing.
3. Set Audio Channel and Trim (Optional): Choose Mono or Stereo under Audio Channel, and use Trim to export only a start-and-duration slice instead of the whole file.
4. Convert and Download: Click "Convert" to get your WAV. No sign-up, no watermark.

Walk-through: Choosing WAV Settings

WAV stores raw, uncompressed linear PCM, so there is no quality knob to tune — what comes off the source track is what lands in the file, sample for sample. The settings that matter are the ones that change the PCM stream itself:

• Keep it faithful: leave Audio Sample Rate on "Original" and Audio Channel on "Original" — the output then mirrors the source track exactly with no resampling.
• Match an editing project: if your DAW or NLE session runs at 48000 Hz, set the sample rate to 48000 Hz so you avoid an in-app resample later.
• Shrink a stereo file you only need in mono: set Audio Channel to Mono to roughly halve the byte count of the WAV.
• Export a clip, not the whole thing: use Trim with a start time and a duration to write only the segment you want.

Because WAV is uncompressed, expect a large file — stereo 44.1 kHz/16-bit PCM is about 10 MB per minute. WAV's header uses a 32-bit size field, so a single file is capped near 4 GiB; very long recordings can hit that ceiling.

Common Errors and How to Fix Them

• "My WAV is silent / empty" — The most common cause: your .cavs was a pure video elementary stream with no audio in it. AVS1 keeps video (Part 2) and audio (Part 3) as separate parts of the standard, so a raw .cavs carries no sound to extract. There is nothing to recover from a video-only stream.
• "I actually wanted to keep the video" — WAV is audio only and discards the picture entirely. If you want the footage in a playable form, convert to a video container instead with CAVS to MP4.
• "The WAV file is enormous" — That is expected; WAV is uncompressed PCM (~10 MB/min for CD-quality stereo). For a smaller file, either set Audio Channel to Mono, or compress the result with WAV to MP3.
• "Conversion failed or the file won't load" — Confirm the file is genuinely an AVS1 .cavs stream and not a misnamed .avs AviSynth script — those are plain-text frame-server scripts, not video, and cannot be converted here.

When This Doesn't Work

This tool can only output sound that already exists in your file. A .cavs saved straight from an AVS1 encoder is video-only and will produce a silent WAV. You will only get real audio when the upload is a multiplexed stream — for example an AVS-in-MPEG-PS file that muxes a separate audio track alongside the video — or a container that wraps both. If your goal is the compressed audio rather than an uncompressed master, CAVS to MP3 produces a far smaller file from the same source.

Frequently Asked Questions

Why is my WAV silent after converting from CAVS?

Because a raw .cavs file is an AVS1 video elementary stream and carries no audio of its own. In the AVS standard, video is Part 2 and audio is a separate Part 3 (GB/T 20090.10), so unless your source actually multiplexed an audio track alongside the video, there is no sound to extract and the WAV comes out empty.

Does converting CAVS to WAV lose any audio quality?

No. WAV stores uncompressed linear PCM, so if your source carries an audio track, the conversion copies those samples without a lossy re-encode. In our testing, leaving both Audio Sample Rate and Audio Channel on "Original" produced a WAV whose PCM data matched the source track bit-for-bit, with no resampling.

Why is the WAV file so much larger than the original?

WAV is uncompressed. Stereo 44.1 kHz/16-bit PCM runs about 10 MB per minute regardless of how compressed the audio was inside the source. If size matters, set Audio Channel to Mono, or convert to a compressed format like MP3 afterward.

Is there a size limit on the WAV I get back?

The WAV format itself caps a single file near 4 GiB because its header records size in a 32-bit field. In practice you are far more likely to be limited by how large a file you can upload than by the WAV ceiling — only multi-hour exports approach 4 GiB.

What is the difference between .cavs and .avs files?

They are unrelated despite the similar names. A .cavs file is encoded video from China's AVS1 standard. A .avs file is usually an AviSynth script — a plain-text frame-server program, not media — so do not upload .avs scripts here expecting audio.

How are my files handled during conversion?

Your file is uploaded over an encrypted connection, processed on our servers, and then deleted automatically a few hours after the conversion finishes. There is no sign-up, no watermark, and files are never shared or made public.