AV1 to RMVB Converter

Convert AV1 to RMVB Online

This tool re-encodes an AV1 video into a RealMedia Variable Bitrate (.rmvb) file for playback in RealPlayer and other legacy RealMedia players. Be aware this is a step backward in codec technology: AV1 is a modern, royalty-free codec from the Alliance for Open Media (spec finalized 2018), while RMVB is a RealNetworks container from 2003. If your goal is broad, future-proof compatibility rather than feeding a specific RealMedia player, convert to MP4 instead.

How to Convert AV1 to RMVB

1. Upload Your AV1 File: Drag and drop your .av1 file onto the page or click "+ Add Files". You can queue several files and convert them with the same settings.
2. Pick the Video Codec: Under Advanced Options, the Video Codec defaults to RealVideo 1.0 (RV10); RealVideo 2.0 (RV20) is also available. FFmpeg has no encoder for the newer RV40, so this output uses the older RealVideo codecs — fine for legacy players, not a modern .rmvb.
3. Set Quality or Target Size: Use the Quality Preset (default "Very High") or switch to "Specific file size", "Constant Bitrate", or "Constant Quality" under File Compression. You can also resize via Preset Resolutions or trim with the Time Range control.
4. Convert and Download: Click "Convert" and download your RMVB file. No sign-up, no watermark.

AV1 vs RMVB at a Glance

Frequently Asked Questions

Why would I convert AV1 to RMVB?

Almost always for one reason: a specific device or player that only accepts RealMedia files, or to match an existing RMVB library (RMVB was widely used for distributing East and Southeast Asian TV and film in the 2000s). For any general-purpose use, AV1, MP4, or WebM will play on far more devices than RMVB.

Will I lose quality converting AV1 to RMVB?

Yes. This is a lossy re-encode from an efficient modern codec to an older one, so some detail loss is unavoidable. It's compounded here because the output uses RealVideo 1.0/2.0 rather than the newer RV40 that modern .rmvb files use — FFmpeg has no RV40 encoder. Start from the highest-quality AV1 source you have and use a high Quality Preset to limit the damage.

Does my AV1 file keep its audio in the RMVB output?

A raw .av1 file is a video-only elementary stream with no audio track, so there is nothing to carry over. If your source has sound, it isn't a bare .av1 OBU stream — and when an audio track is present, this tool pairs the RealVideo codec with RealAudio (REAL_144) for RealMedia compatibility.

Is the output a real modern RMVB file?

It's a valid RealMedia Variable Bitrate container that legacy RealMedia players will open, but it is encoded with RealVideo 1.0 or 2.0, not the RV40 codec used by most .rmvb files circulating today. In our testing, RV10/RV20 output plays in VLC and RealPlayer; if a target app rejects it, it likely expects RV40, which no open-source encoder can produce.

What plays RMVB files in 2026?

RealPlayer is the original and most reliable option. VLC plays RMVB across Windows, macOS, Linux, Android, and iOS without extra codecs, and Media Player Classic handles it on Windows. If you'd rather not install a legacy player, convert the file the other way — RMVB to MP4 — and play it anywhere.

Are my uploaded files private?

Yes. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There's no sign-up, no watermark, and files are never shared or made public.