RMVB to MKV Converter
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Supports: RMVB
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Convert RMVB to MKV
- Upload Your RMVB File — Click "Choose Files" or drag and drop your RMVB (RealMedia Variable Bitrate) video file. Only .rmvb files are accepted.
- Choose Video Codec — Under Video Codec, the default for MKV output is H.264. Available codecs include H.264, H.265/HEVC, AV1, VP8, VP9, MPEG-4, Theora, and others.
- Set Video Quality — Under File Compression, choose from: Quality Preset (Highest through Lowest), Target File Size % (1-100% slider), Specific File Size (MB/KB), Constant Bitrate, Variable Bitrate, Constant Quality (CRF), or Constraint Quality.
- Set Audio Codec — Under Audio Codec, the default for MKV is AAC. MKV supports virtually every audio codec: AAC, AC3, MP3, FLAC, Opus, Vorbis, DTS, and more.
- Adjust Resolution (Optional) — Under Video Resolution, keep the original or choose presets (1080p, 720p, 480p, etc.) or custom dimensions.
- Trim (Optional) — Under Trim, set a Start Time and Duration to extract a specific segment.
- Convert & Download — Click "Convert" and download your MKV file.
Why Convert RMVB to MKV?
RMVB (RealMedia Variable Bitrate) is a legacy video format from RealNetworks that was popular in the 2000s, especially in Asian markets for sharing movies and TV shows. RMVB files require RealPlayer or VLC to play and are not supported by most modern devices, editors, or streaming platforms. MKV (Matroska) is an open-source container that supports every modern codec and plays on VLC, Plex, Kodi, and most media players. Converting RMVB to MKV modernizes your video library with universal playback support, enables editing in DaVinci Resolve, Kdenlive, and other editors, allows streaming through Plex, Jellyfin, or Emby media servers, and preserves video quality while upgrading to a modern container.
RMVB vs MKV Comparison
| Feature | RMVB | MKV |
|---|---|---|
| Developer | RealNetworks | Matroska.org (open-source) |
| Video codec | RealVideo (RV10, RV20) | Any (H.264, H.265, AV1, VP9, etc.) |
| Audio codec | RealAudio | Any (AAC, FLAC, AC3, DTS, Opus, etc.) |
| Subtitles | Limited | Multiple tracks, multiple formats |
| Player support | VLC, RealPlayer only | VLC, Plex, Kodi, mpv, MPC-HC |
| Modern device support | Very limited | Broad |
| File size | Small (aggressive VBR) | Depends on codec choice |
Which video codec should I choose?
H.264 (the default) offers the best compatibility. H.265/HEVC produces ~40% smaller files. For Plex or Kodi media servers, both H.264 and H.265 work well. AV1 offers the best compression but is slower to encode.
Will converting RMVB to MKV improve quality?
Converting cannot add detail that wasn't in the original RMVB. However, re-encoding with H.264 at a high quality setting produces a clean, modern file. Use "Highest" Quality Preset or Constant Quality (CRF) with a low value for the best results.
Can I add subtitles to the MKV?
This tool converts the video and audio tracks. MKV natively supports multiple subtitle tracks — after conversion, you can add subtitles using MKVToolNix or a video editor.
Can I trim the video during conversion?
Yes. Under Trim, select "Time Range" and enter a Start Time and Duration in seconds or HH:MM:SS.sss format.
Is RMVB still used?
RMVB is largely obsolete but still found in personal media libraries, especially in China, Japan, and Southeast Asia. Converting to MKV or MP4 future-proofs these files before they become unplayable.