AV1 to RMVB Converter

AV1 vs RMVB — Which One Should Your File Be?

If you are here you almost certainly have one specific target that only accepts .rmvb: a RealPlayer install, an old media box, or an existing RealMedia library you want the clip to sit next to. In every other respect this conversion moves backwards — AV1 is the Alliance for Open Media's royalty-free codec whose 1.0.0 bitstream spec was published in 2018, while RMVB is RealNetworks' variable-bitrate flavour of RealMedia from the early 2000s. Convert to RMVB when a legacy RealMedia target demands it, and stay on AV1 (or move to MP4) for anything you actually plan to watch, edit, or share.

Side-by-side Comparison

Browser support figures come from caniuse's AV1 table, which puts combined AV1 playback around 94% of tracked traffic; RMVB has never had a browser implementation.

When to Pick RMVB

• A player, kiosk, or set-top box in front of you rejects everything except RealMedia files.
• You are rebuilding or completing an archive of .rm/.rmvb material and want one consistent container.
• The clip is destined for software written against RealNetworks' SDK, where the container is part of the contract.
• You need the file to open on a Windows XP or early-Vista era machine that still has RealPlayer but no modern codec pack.

When to Stay on AV1

• You want the file to play in a browser, on a phone, or on a smart TV — RMVB does none of those natively.
• File size matters: RealVideo 1.0/2.0 needs far more bitrate than AV1 to reach the same visual quality.
• The file is a master you will edit or re-encode later; each pass through RealVideo throws away detail you cannot get back.
• You simply want it to play everywhere, in which case AV1 to MP4 is the sane target and AV1 to MKV keeps the stream in a flexible container.

What the RealVideo Encoders Here Can and Cannot Do

How to Convert AV1 to RMVB

1. Upload Your AV1 File: Drag and drop the file onto the page or click "+ Add Files". Several files can be queued and converted with the same settings.
2. Choose the Video Codec: Open Advanced Options and then "Show All Options" to reach Video Codec. RealVideo 1.0 is preselected; RealVideo 2.0 sits beside it. Audio Codec, in the same panel, offers AAC, AC3, and RealAudio 1.0.
3. Set Quality or Target Size: Under File Compression, keep Quality Preset on "Very High (Recommended)", or switch to Specific file size, Constant Bitrate, Constant Quality, or Constraint Quality. Video resolution and Trim are on the same panel if you want to downscale or export a Time Range.
4. Convert and Download: Click Convert and download the .rmvb. No sign-up, no watermark.

Frequently Asked Questions

Why would anyone convert AV1 to RMVB in the first place?

Compatibility with something old and fixed. RMVB was widely used for distributing East and Southeast Asian TV and film in the 2000s, so people still hold libraries, media boxes, and RealPlayer installs built around it. If the goal is general playback rather than matching that ecosystem, AV1, MP4, or WebM will open on far more devices.

Will I lose quality converting AV1 to RMVB?

Yes, and more than a typical transcode. This is a lossy re-encode from a 2018-generation codec into RealVideo 1.0 or 2.0, which are roughly two decades older and need several times the bitrate for the same picture. Start from the best AV1 source you have, keep Quality Preset high, and avoid converting an already-converted file.

Does this produce a modern RMVB with RV40 video?

No, and no open tool can. We checked FFmpeg's encoder list while writing this page: it ships rv10 and rv20 encoders, while RV30 and RV40 appear only as decoders. The output is a valid RealMedia Variable Bitrate file carrying RealVideo 1.0 or 2.0 — legacy players open it, but an app that specifically expects RV40 may not.

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

If the source has an audio track, yes — it is decoded and re-encoded into the RMVB with the codec chosen under Audio Codec. Files named .av1 are usually AV1 video inside a Matroska wrapper (that is exactly what xconvert's own AV1 converter writes, complete with an AAC track), so audio normally survives. A bare AV1 elementary stream, by contrast, codes video only and has no sound to carry over.

Which audio codec should I choose for an old RealPlayer?

Try AAC first; RealAudio 10 used AAC, so most later RealPlayer builds handle it. If the picture plays but the sound is missing on a genuinely old install, switch Audio Codec to RealAudio 1.0, which every RealMedia-era decoder understands. Be aware of the trade: that encoder is limited to 8 kHz mono, so speech stays intelligible while music turns muddy.

Is an RMVB file smaller than the AV1 it came from?

Usually the opposite. RMVB's "variable bitrate" was a genuine advance over fixed-rate RealMedia in its day, but AV1 compresses far harder, so hitting comparable quality with RealVideo takes noticeably more data. If size is the objective, use Specific file size or Constant Bitrate under File Compression and accept the softer picture that comes with it.

What still plays RMVB files today?

RealPlayer remains the reference implementation. VLC opens .rmvb on Windows, macOS, Linux, Android, and iOS without extra codecs, and Media Player Classic handles it on Windows. If you would rather not keep a legacy player installed, run the file the other way with RMVB to MP4 and be done with it.

Can RMVB do anything MP4 cannot?

Nothing technical. RMVB's advantage is purely historical: it is what a particular generation of players, downloads, and devices expects. MP4 with H.264 or AV1 beats it on efficiency, tooling, browser support, and hardware decoding, which is why almost every RMVB question ends with someone converting away from the format rather than into it.

How are my uploaded files handled?

Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically a few hours after conversion. There is no sign-up and no watermark, and nothing is shared or made public.