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RM MKV
File conversion

Convert RM to MKV

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Verified by Adam B.· reviewed by FE Editorial ·updated Jul 24, 2026
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Is it possible to convert RM to MKV?
Yes - RM converts to MKV.

You can do it right here with our free converter - no sign-up, and your file is deleted right after.

Upload your .rm file to the converter above and download the .mkv - it is free and your file is deleted after conversion. If you prefer the command line, run ffmpeg -i input.rm -c:v libx264 -c:a aac output.mkv. The key caveat: video and audio must be re-encoded, so output quality is limited by the original source bitrate.

7 programs
Also to MKV: USM · TP · MPEG4

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Open the toolbox
RM → MKV converterFREE
Drop a .RM file here
or pick one - we convert it to .MKV and give you the file to download

Why convert RM to MKV?

RealMedia uses proprietary codecs that modern players and devices no longer support well. Converting to .MKV gives you an open container compatible with VLC, Plex, Kodi, and most TVs and phones. MKV also supports multiple subtitle tracks and audio streams, making it a solid archival format for older .rm and .rmvb files.

How to convert RM to MKV

Command line - FFmpeg CLI

Run ffmpeg -i input.rm -c:v libx264 -c:a aac output.mkv to re-encode the file to H.264/AAC inside an MKV container.

HandBrake FREE

Open your .rm file in HandBrake, set the format to MKV, choose a preset, and click Start Encode.

Freemake Video Converter FREE

Add your .rm file, choose MKV as the output format, and click Convert.

MediaCoder FREE

Import your .rm file, select MKV as the container, and start the encode.

Programs that convert RM

Free Studio
Freemake Video Converter
ImTOO DPG Converter
MediaCoder
Sothink Movie DVD Maker
SUPER
Xilisoft Video Converter

About these formats

.RM RealMedia File

An RM file is a RealMedia video or audio clip created by RealNetworks, common in internet video from the late 1990s and 2000s. VLC media player opens it for free on Windows, macOS, Linux,…

Open .RM details →
.MKV Matroska Video

An MKV file is a Matroska multimedia container that holds video, multiple audio tracks, subtitles and chapters in one file. Open it for free with VLC media player, or on Windows 11 with the…

Open .MKV details →

Quality & what to watch

  • Re-encoding is required - RealVideo (RV10-RV40) and RealAudio (cook, sipro) codecs are proprietary and rarely decode correctly inside MKV, so streams must be converted to H.264/AAC.
  • Quality is capped by the original source; re-encoding cannot recover detail lost when the .rm file was first compressed at low bitrate.
  • If your file is .rmvb with embedded text subtitles, FFmpeg may carry them into the MKV output - check the result in VLC or MKVToolNix.

Frequently asked questions

Can I convert `.rmvb` to MKV the same way?
Yes - FFmpeg and HandBrake handle .rmvb identically to .rm; just change the input filename.
Why does my converted MKV have no audio?
Some RM files use the cook or sipro RealAudio codec; make sure you are using a full FFmpeg build from ffmpeg.org, which includes all necessary decoders.
Is MKV better than MP4 for converted RM files?
MKV is the better choice if you want to preserve multiple subtitle or audio tracks; MP4 is more compatible with phones, TVs, and streaming services.
Will the converted MKV look better than the original RM?
No - re-encoding cannot recover detail lost during original compression, so the MKV will look the same as or very slightly softer than the source.