MKV to RMVB Converter

Convert MKV to RMVB (RealMedia Variable Bitrate)

This tool re-encodes a Matroska .mkv video into a RealMedia .rmvb file on xconvert's servers, writing a RealVideo video track and a RealAudio audio track. Be clear-eyed about the direction first: in 2026 almost nobody should be converting into RMVB. No mainstream browser plays .rmvb, the RealVideo codecs this tool writes date to the late-1990s/early-2000s, and RMVB carries no subtitle or chapter tracks — so a modern MKV loses both picture quality and its extras. RMVB earned its niche as the East Asian TV-serial and fansub archive format, prized in the mid-2000s for fitting a 45-minute drama episode into a small download. The only honest reasons to still target it: you're matching an existing .rmvb library so a collection stays uniform, or you're feeding 2005-2012-era Chinese-market hardware or a media server that specifically lists RMVB. If you just want a smaller, playable file, use MKV to MP4 instead. If you landed here trying to open old .rmvb files, the rescue direction is RMVB to MP4.

MKV (Matroska) Format at a Glance

RMVB (RealMedia Variable Bitrate) Format at a Glance

RMVB is the variable-bitrate sibling of .rm: where the standard RealMedia container holds constant-bitrate (CBR) streams built for predictable streaming, RMVB spends bits unevenly so a fixed average size looks better on busy scenes. That made it the de-facto format for distributing Asian content — especially Chinese television episodes and movies — through the mid-2000s. One important nuance: this tool writes the older RealVideo codecs (RV10/RV20, built on ITU-T H.263), not the later H.264-rivalling RV40 that some RMVB encoders used. Mainstream RealVideo development largely wound down after RealNetworks sold its next-generation codec patents and software to Intel in 2012 (a $120 million deal announced in January and completed that April). So treat RMVB here as a compatibility and archival target, not a way to gain quality.

How to Convert MKV to RMVB

1. Upload Your MKV File: Drag and drop or click "+ Add Files" to add one or more .mkv files. Batch upload is supported — queue several clips to convert with the same settings in one pass.
2. Pick Quality Preset and Video Codec: Under File Compression, choose a Quality Preset (Very High is the recommended default). The Video Codec defaults to RealVideo 1.0 (RV10), the most broadly compatible RealMedia codec; switch to RealVideo 2.0 (RV20) only if your target player supports it. To lean into RMVB's variable-bitrate strength, you can instead pick Variable Bitrate, or target a fixed output with Specific file size.
3. Set Resolution and Trim (Optional): Use Preset Resolutions or Width (Keep aspect ratio) to scale down, and Trim → Time Range to clip out a segment.
4. Convert and Download: Click Convert. The file processes on our servers and downloads as .rmvb. No sign-up, no watermark.

Frequently Asked Questions

Why would anyone convert MKV to RMVB in 2026?

Two honest cases. One: you already keep a library of .rmvb episodes or films — typically archived Asian TV dramas or fansubbed releases — and want new clips in the same container and codec so players like VLC and RealPlayer treat the collection uniformly. Two: you're feeding 2005-2012-era Chinese-market hardware, a kiosk, or a media server that lists RMVB as a supported format and chokes on modern containers. For anything public-facing or future-proof, use MKV to MP4 instead — it plays natively in every browser and on every modern device.

What is the difference between RMVB and RM?

RM (RealMedia) holds a constant-bitrate stream, which is what RealNetworks designed for predictable streaming over fixed-bandwidth links. RMVB (RealMedia Variable Bitrate) instead spends more bits on complex, fast-moving frames and fewer on simple ones, so at the same average file size it generally looks better — at the cost of being harder to stream live. That tradeoff is exactly why RMVB became the local-storage and download format of choice for TV-serial archives, while plain .rm stayed in streaming.

Why does my RMVB file look worse than the source MKV?

Because you're re-encoding modern video with an early-2000s codec. The RealVideo codecs this tool writes — RV10 and RV20 — are both built on ITU-T H.263 and are far less detail-preserving than the H.264, HEVC, VP9, or AV1 video your MKV likely contains. Variable bitrate helps spend bits where they matter, but no preset closes the generational gap; "Very High" only reduces how much you lose. If visual quality matters, RMVB is the wrong target — convert with MKV to MP4 instead, which keeps far more detail at the same size.

Will my MKV's subtitles, chapters, and extra audio tracks survive?

No. MKV is a rich multi-track container — it can carry several audio languages, soft subtitles (SRT/ASS/PGS), chapter markers, and metadata. The RealMedia container this tool writes keeps one video track and one audio track; subtitles and chapters are dropped. This matters more for RMVB than for most targets, because RMVB releases historically came from a hard-sub culture — subtitles were burned into the picture, not stored as a separate track. If you need selectable subtitles, hard-burn them before converting or stay in a format like MP4 that at least supports a subtitle track.

Should I pick RealVideo 1.0 (RV10) or RealVideo 2.0 (RV20)?

RV10 (the default) is RealVideo 1.0 and plays in essentially every player and device that has ever supported RealMedia, including old set-top boxes. RV20 corresponds to RealVideo G2 and is marginally more efficient, but some legacy hardware rejects it. If your target is a software player like VLC or RealPlayer, either is fine; if you're feeding 2005-2012-era media hardware, stay on RV10. Note this tool does not write the later H.264-class RV40, so don't expect modern-codec efficiency from either choice.

Are RMVB files actually smaller than the source MKV?

Often, but not because RMVB is more efficient — it is the opposite. RMVB files look small mainly because the originals were encoded at low resolutions and bitrates for the bandwidth of their era, and because variable bitrate avoids wasting bits on flat scenes. If you take a 1080p H.265 MKV and re-encode it to RMVB at a similar size, you will simply get a blurrier picture, not a free win. To genuinely shrink a modern MKV while keeping it playable, use MKV to MP4 and target a specific file size there.

What happens to my uploaded MKV file after the conversion?

It is uploaded over an encrypted connection, the encode runs on xconvert's converter nodes, and the source file is deleted automatically a few hours after conversion. In our testing the encoder writes a standard RealMedia file with an RV10 (or RV20) video track and a RealAudio 1.0 audio track. There is no account, no watermark, and nothing is stored permanently or made public.