DivX to RM Converter
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Supports: DIVX
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DivX is MPEG-4 Part 2 (Advanced Simple Profile) video, normally sitting in an AVI-derived container with an MP3 soundtrack. RM is RealNetworks' RealMedia container, the streaming format of the RealPlayer era. This converter decodes your DivX and re-encodes it as RealVideo inside a .rm file so a legacy RealPlayer install or an old .rm-based archive can take it. Go in with clear eyes: RM is an obsolete delivery format, and this is a full re-encode, so there is one generation of loss. If your goal is a file that plays on anything modern, convert DivX to MP4 instead.
How to Convert DivX to RM
- Upload Your DivX File: Drag and drop your
.divxfile onto the page or click "Add Files." Several files can be queued and converted with the same settings. - Pick Video Codec and Audio Codec: Open Advanced Options. Video Codec offers RealVideo 1.0 (preselected) and RealVideo 2.0; Audio Codec offers AAC, AC3, and RealAudio 1.0 (the pick for strict legacy workflows).
- Choose a Compression Mode, Resolution, or Trim: Quality Preset opens on "Very High (Recommended)", with Specific file size, Constant Bitrate, Constant Quality, and Constraint Quality as alternatives. Video resolution stays on "Keep original" unless you choose a preset or type dimensions, and Trim → Time Range exports a section.
- Convert and Download: Click Convert and save the
.rmfile. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.
DivX vs RM at a Glance
| Property | DivX (source) | RM (output) |
|---|---|---|
| Origin | DivX codec family, popularised from the early 2000s | RealNetworks, from the late 1990s |
| Video compression | MPEG-4 Part 2 / ASP | RealVideo — RV10 or RV20 here |
| Typical audio | MP3, sometimes AC-3 | Selectable: AAC, AC-3, or RealAudio 1.0 |
| Container | AVI-derived file carrying the .divx extension |
RealMedia (.rm) |
| Designed for | Fitting a feature-length film into a small download | Low-bandwidth internet streaming |
| Plays in | VLC, DivX Player, most desktop players | RealPlayer; VLC and MPC-HC open many .rm files |
| Browser playback | None natively | None |
| Status | Legacy, still widely playable | Obsolete; superseded by MP4 and WebM |
What the RealVideo Encoder Actually Does
RealVideo is an old codec family with hard structural limits, and our pipeline enforces them for you rather than letting the job fail. Three behaviours are worth knowing before you compare the output against your source.
| Behaviour | What happens | Why |
|---|---|---|
| Frame size alignment | Output dimensions are adjusted to multiples of 16 | RV10/RV20 encode in 16-pixel macroblocks, so odd sizes are nudged to the nearest legal one |
| Bitrate ceiling | Very high bitrate requests are capped automatically | The RealMedia muxer takes a maximum of roughly 64 KB per packet, so a frame that would exceed it cannot be written |
| Rate control | VBV-style controls (max rate, buffer size) are dropped | The RV10 and RV20 encoders accept simple bitrate or quality targets only |
None of these is a failure mode — they are what makes the file a valid RealMedia stream. They do mean a high-bitrate HD source will be constrained on the way into a format that was designed for dial-up and early broadband.
When RM Is (and Isn't) the Right Target
- Choose RM when something specific requires it: a RealPlayer-only playback machine, an archive whose playlists reference
.rmfiles, or a legacy streaming server that expects RealMedia. - Choose RealVideo 1.0 for the widest compatibility with old players; RealVideo 2.0 compresses somewhat better and is still read by the same generation of software.
- Don't choose RM for sharing, editing, phones, TVs, or the web. Nothing in a modern chain reads it natively — MP4 is the right call, and DivX to WebM covers browser-native delivery.
- Don't expect RV40. The
.rmvbfiles people associate with later RealMedia releases use RealVideo 4, which no open encoder produces; see the FAQ below.
Frequently Asked Questions
What still plays a .rm file today?
RealPlayer is the reference implementation and handles RealMedia fully. VLC and MPC-HC open many .rm files through their own RealVideo and RealAudio decoders, though specific variants can trip them up. No mainstream browser plays .rm at all. That narrow support is exactly why RM only makes sense for legacy workflows — for anything else, DivX to MP4 is the safer target.
Which audio codec goes into the RM file?
The Audio Codec list offers AAC, AC3, and RealAudio 1.0. AAC is the modern, efficient choice and is what you want if the file is destined for a player with broad codec support. Pick RealAudio 1.0 when you are feeding genuinely old RealPlayer-era software that expects a RealAudio track, and AC3 when a downstream system specifically asks for Dolby Digital.
Why does xconvert offer RealVideo 1.0 and 2.0 but not RV40?
Because the FFmpeg engine behind the conversion ships encoders for RealVideo 1.0 and 2.0 only. FFmpeg's own format and codec table marks RealVideo 3.0 and RealVideo 4.0 as decode-only — it can read those streams but cannot create them. Since RV40 is what .rmvb files typically carry, no online transcoder built on FFmpeg can produce a true RV40 file.
Then what do I get if I ask for RMVB?
The same RealVideo 1.0 or 2.0 stream in a RealMedia container, because that is the only RealVideo our encoder can write. The DivX to RMVB route exists for workflows that require the .rmvb extension, but it is not the variable-bitrate RV40 encoding that the extension historically implied.
Why did the frame size change slightly?
RealVideo encodes in 16-pixel macroblocks, so our pipeline aligns the output dimensions to the nearest multiple of 16. A 1918×1078 source, for example, cannot be written as-is. The shift is at most a handful of pixels and the aspect ratio is preserved as closely as the alignment allows.
Why is my bitrate lower than the value I typed?
Because the RealMedia container limits how much data a single packet can carry — roughly 64 KB. A bitrate that would push a keyframe past that limit produces an unwritable file, so the encoder caps the request at the highest value that still muxes cleanly. If you need higher quality than that ceiling allows, RM is simply the wrong container for the material.
Will I lose quality converting DivX to RM?
Yes, one generation. DivX is already lossy, and RealVideo re-compresses the decoded frames with an older, less efficient codec — this is a transcode, never a rewrap. Keeping Quality Preset at "Very High (Recommended)" and the original resolution minimises it, but the RV10/RV20 encoders are a generation behind MPEG-4 ASP to begin with. Always keep the original .divx as your master.
What happens to my file during and after the conversion?
It is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public. If you also have old RealMedia files to modernise, RM to MP4 runs the conversion in the other direction.