CAVS Converter

How to Convert CAVS to Any Format

1. Upload Your CAVS File: Drag and drop your .cavs clip or click "Add Files". CAVS is a raw Chinese AVS video stream, so it decodes server-side with FFmpeg even when your desktop player only plays the audio. Batch is supported — drop in several files and each one converts in parallel.
2. Pick an Output Format and Quality Preset: Open the Video File Extension dropdown and choose a target — MP4, MKV, MOV, WebM, AVI, MPEG, GIF, and 30+ more — or pick an audio format like MP3 to keep only the soundtrack. The default Quality Preset is "Very High (Recommended)"; switch to Specific file size to cap output at an exact MB target, or to Constant Bitrate, Variable Bitrate, Constant Quality, or Constraint Quality for finer control.
3. Resize, Trim, or Change Codec (Optional): Under Video resolution, keep original, pick a Preset Resolution (2160p / 1440p / 1080p / 720p / 480p), scale by Resolution Percentage, or enter a custom Width × Height. Under Trim, choose Time Range and set start + duration. Advanced users can override the Video Codec (H.264, H.265, VP9, AV1, MPEG-4) and Audio Codec.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Popular CAVS Conversions

• CAVS to MP4 — the universal target that plays on Windows, macOS, iOS, Android, and every modern browser
• CAVS to MKV — multi-track container for media-server libraries with subtitles and dubs
• CAVS to MOV — for Final Cut Pro and Apple device editing
• CAVS to WebM — smaller, royalty-free files for HTML5 web embeds
• CAVS to AVI — legacy Windows editors and players
• CAVS to MP3 — extract just the audio track
• CAVS to GIF — short silent loops for chat and docs

Why Convert a CAVS File?

CAVS holds video encoded with AVS (Audio Video Coding Standard of China), the codec developed by China's Audio Video Coding Standard Workgroup, founded in 2002 and headed by academician Gao Wen. The first-generation standard was adopted as Chinese national standard GB/T 20090.2-2006 in February 2006, and its compression efficiency is roughly comparable to H.264/MPEG-4 AVC. AVS is used inside China for IPTV and broadcast delivery, but the raw .cavs elementary stream is a niche, hard-to-play file almost everywhere else.

That mismatch is the whole reason this conversion exists. A .cavs file is not a container with neatly muxed audio and video — it is a bare AVS video bitstream, which is why most desktop players either refuse it or play sound with no picture. Re-encoding into a mainstream container fixes that:

• Playback anywhere (MP4 / MKV / MOV) — Converting to MP4 wraps the decoded frames in H.264 + AAC so the clip plays on practically any device. Choose MKV when you need multiple audio or subtitle tracks for a Plex or Jellyfin library, or MOV for Apple-centric editing in Final Cut Pro.
• Editing and the open web (MOV / WebM) — Editors want a standard container they can import; MOV is the safe choice on macOS. For an HTML5 <video> embed, WebM (VP9 or AV1) lands smaller at comparable quality, though Safari's AV1 support is recent and partial.
• Audio only (MP3) — Pulling the soundtrack out of a CAVS clip is a decode-then-encode: the converter drops the video and re-encodes the audio to MP3. See CAVS to MP3 for the audio-extraction flow.
• Sharing and previews (GIF) — A short clip becomes a silent looping GIF that embeds in Slack, a README, or a forum post. GIF has no audio and grows large past a few seconds, so it suits clips under ~10 seconds.

CAVS at a Glance vs. Common Conversion Targets

Frequently Asked Questions

What is a CAVS file and why won't it play on my computer?

A .cavs file stores video encoded with AVS, the Audio Video Coding Standard of China standardized as GB/T 20090.2-2006. It is usually a raw AVS video bitstream rather than a packaged container, so mainstream players like Windows Media Player or QuickTime either reject it or play the audio with a blank picture. FFmpeg-based tools can decode it, which is why converting to MP4 or MKV is the reliable way to actually watch the footage.

Which output format should I pick for the widest compatibility?

Convert CAVS to MP4. The MP4 container with H.264 video and AAC audio plays on Windows, macOS, iOS, Android, smart TVs, game consoles, and every modern browser, so it is the safest landing spot for a file that came from a Chinese AVS pipeline. If you need multiple audio or subtitle tracks for a Plex or Jellyfin library, choose MKV instead.

Will I lose quality converting from CAVS?

Some, because the AVS video has to be decoded and re-encoded into the target codec — there is no byte-for-byte remux path the way there is between closely related containers like MP4 and MOV. The loss is small if you keep the Quality Preset at "Very High" or set Constant Quality and leave the resolution unchanged. Re-encoding to an efficient codec such as H.265 or AV1 can hold near-identical perceptual quality at a smaller file size.

In your testing, how big is a converted CAVS file?

In our testing, a 30-second standard-definition CAVS clip re-encoded to MP4 (H.264, "Very High" preset) produced a file roughly comparable in size to the source, since AVS1 and H.264 sit in the same compression class. Choosing H.265 or AV1, or downscaling the resolution, brings that figure down further when you need a smaller file for sharing or email.

Can I extract just the audio from a CAVS file?

Yes. Pick an audio format such as MP3 as the output and the converter drops the video track and encodes the audio stream — handy when the video itself won't play but you still want the soundtrack. The dedicated CAVS to MP3 page covers the audio-extraction settings, including bitrate selection.

Is there a file-size limit for converting CAVS?

There's no fixed per-file cap. Conversion runs on our servers, so the practical limit is upload size and your connection speed rather than your device's memory. Batch jobs have no quantity limit either — you can queue several .cavs files and download them together. Files are uploaded over an encrypted connection and deleted automatically a few hours after conversion.

Can I convert CAVS to GIF or a still image?

Yes. Choose GIF to turn a short clip into a silent looping animation — best kept under about 10 seconds, since GIF has no audio and grows large quickly. You can also export single frames to image formats. For full video playback, though, CAVS to MP4 is the better target.