RMVB is RealMedia Variable Bitrate video, popular for compact legacy distribution.
What this converter actually supports
Convertr uses the deployed FFmpeg toolchain for published audio and video routes. A container such as MP4, MOV, MKV, AVI, or WebM can hold different codecs, so the file extension alone does not guarantee that a particular player will accept the contents.
Convert RMVB to MP4 for modern phones, browsers, televisions, and editors.
The public upload limit is 1 GB. Convertr does not reduce dimensions, duration, resolution, or output quality merely to manage worker load.
Quality and format limits
Keep the original dimensions and frame rate unless you intentionally need a smaller result. Remuxing compatible streams avoids re-encoding; changing codecs is lossy, so repeated conversions should be avoided.
Proprietary codec variants and variable timestamps can cause decode or sync problems.
Published RMVB inputs
These links come from the active conversion catalog, not from a generic list of possible formats.
No inbound route is currently published.
Published RMVB outputs
Choose one of these implemented routes; a listed extension is not a promise that every codec variant will decode.
Check that the file opens in its original application, is not encrypted or DRM-protected, and really matches its extension. A damaged header, unsupported internal codec, missing linked asset, or mislabeled file can fail even when RMVB is generally supported. Try a different published target only when it fits your goal; changing the extension by hand does not convert the file.