RM to DivX Converter
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Supports: RM
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Need help?Convert RM to DivX
DivX is an MPEG-4 Part 2 Advanced Simple Profile video codec — the commercial counterpart to the open-source Xvid — and for a stretch of the 2000s it was the format that standalone DVD players, media boxes and set-top players advertised on the front panel. Converting a RealMedia clip to DivX is a legacy-hardware move: RealMedia was never supported by any of that equipment, and DivX was.
What you download is a .divx file, and it is worth being precise about that. DivX is a codec, not a container, so the video has to be wrapped in something — we wrap it in AVI. Open the file in a hex viewer and the first twelve bytes read RIFF, a length, then AVI . Renaming it to .avi changes nothing about the bytes and makes most players, editors and file managers behave normally, so it is usually the first thing to do after downloading.
How to Convert RM to DivX
- Upload Your RM File: Drag the
.rmonto the page or click "Add Files" to browse. Several clips can be queued and converted with one set of settings. - Choose an Audio Codec: Video Codec is fixed to DivX here, but Audio Codec defaults to MP3 — the pairing DivX-era hardware expects — with AC3, AAC, EAC3, DTS, FLAC, MP2, Vorbis, Speex, WMA v1/v2 and four PCM variants also listed. Read the compatibility note below before straying from MP3.
- Set Quality, Resolution or Trim (Optional): File Compression opens on Quality Preset. Constant Quality and Constraint Quality give you a direct quality number, and Specific file size, Constant Bitrate and Variable Bitrate are also available. Video resolution keeps the original by default; Trim exports a start time and duration.
- Convert and Download: Click Convert and save the file, then rename it to
.aviif your player is fussy. Files are uploaded over an encrypted connection, processed on our servers and deleted automatically after a few hours. No sign-up, no watermark.
What the Output File Actually Is
| Property | Value |
|---|---|
| Downloaded extension | .divx |
| Actual container | AVI — the file begins RIFF … AVI |
| Video coding standard | MPEG-4 Part 2, Advanced Simple Profile |
| Encoder | libavcodec's native MPEG-4 encoder, the same one behind our MPEG-4 target |
| Stream FourCC written | FMP4, the generic MPEG-4 tag, not DIVX or DX50 |
| Default audio | MP3 |
| Dimension rounding | Each dimension is rounded down to an even number |
| Safe rename | .avi |
The FourCC row is the one that occasionally matters. Software players — VLC, mpv, MPC, any modern editor — identify the codec from the stream itself and play the file regardless of the tag. Some hardware DivX-certified players from the 2000s were stricter and looked for DIVX or DX50 specifically. If a set-top box rejects the file, that tag is the likely reason, and a FourCC-rewriting utility fixes it without re-encoding.
Picking a Quality Mode
| Mode | What you name | Notes |
|---|---|---|
| Quality Preset | A quality band | The opening mode. On a real video source it derives a bitrate target from the source's own bitrate, so the encoder runs in bitrate mode |
| Constant Quality | A single quality number | The slider is labelled CRF but runs 1–31, which is this encoder's quantiser scale, not H.264's 16–51. Lower is better: 2–5 is high quality, 31 is the worst the encoder will do |
| Constraint Quality | A quality number plus a maximum bitrate | The most predictable choice on this codec — a quality target with a ceiling so the bitrate cannot spike |
| Constant Bitrate / Variable Bitrate | An explicit rate in bps, Kbps or Mbps | Use when a specific device expects a known rate |
| Specific file size | A target size, with an Auto Scale option | Use when you have a hard size budget |
One practical warning about the bitrate-based modes. This encoder refuses bitrate targets it cannot physically reach at your frame size, and reports bitrate too low for this video with these parameters rather than producing a smaller file. If a conversion comes back with an error along those lines, raise the Quality Preset a step, or switch to Constant Quality or Constraint Quality — neither of those asks the encoder to hit a fixed bitrate, so neither can trip that condition.
Frequently Asked Questions
Why is my download called .divx, and will anything open it?
Because you asked for DivX, and DivX is a codec rather than a file format, so the extension names the codec while the bytes are an AVI. VLC, mpv, MPC-HC and most desktop players open .divx directly. If something refuses it, rename the file to .avi — that is not a conversion, just a label change, and it resolves nearly every "unknown file type" complaint.
Is DivX the same thing as Xvid?
They implement the same standard — MPEG-4 Part 2 Advanced Simple Profile — so a player that handles one almost always handles the other. The historical difference is licensing: DivX was a proprietary commercial codec while Xvid is open source under the GPL. On our side the difference is the encoder each target uses, which changes how the rate-control options behave. If your player specifically lists Xvid, use RM to Xvid; if it lists DivX, stay here.
What audio codec should I actually pick?
Leave it on MP3 unless you have a reason not to. The Audio Codec list on this page is the generic one and offers more codecs than an AVI file — or a DivX-era player — reliably handles. MP3, AC3 and 16-bit PCM are the combinations AVI is genuinely built for. FLAC, Vorbis, Speex, DTS and the WMA variants can be muxed but are outside what DivX hardware was ever tested against, and a set-top box that rejects the audio will usually reject the whole file.
My conversion failed with a bitrate error — what should I change?
Switch File Compression to Constant Quality and set the slider somewhere in the 4–10 band, or use Constraint Quality if you also need a bitrate ceiling. The bitrate-based modes ask this encoder to hit a specific rate, and it will refuse a target it cannot reach at your resolution instead of quietly overshooting. Quality-based modes let it spend whatever it needs, which sidesteps the problem entirely. Raising the Quality Preset a step has the same effect.
Does the Constant Quality slider really run 1 to 31?
Yes, and that is a genuine difference from the H.264 pages, where the same control runs 0–51. This encoder uses ffmpeg's quantiser scale, which is capped at 31 by the MPEG-4 Part 2 specification itself. Lower is better on both scales, but the numbers are not interchangeable — a value of 23, perfectly ordinary on H.264, is close to the worst quality this encoder offers. Stay in the low single digits for good output.
Will converting RM to DivX improve the picture?
No. RealMedia clips were compressed hard for narrowband streaming, and MPEG-4 Part 2 is a less efficient codec than anything modern, so the second encode can only preserve or degrade what is there. A high Quality Preset or a low Constant Quality number keeps the additional loss small. There is no deinterlacing in this pipeline either, so an interlaced source keeps its combing.
Should I convert to DivX at all, or go straight to MP4?
Go to MP4 unless a specific piece of hardware requires DivX. H.264 in an MP4 container is smaller at the same quality, plays natively in every current browser and phone, and does not need renaming to be recognised — RM to MP4 is the conversion most people arriving here actually want. DivX is worth it when you are feeding a 2000s DVD player, a legacy media box, or an editing workflow already built around AVI.
Can I convert only part of the clip?
Yes. Set Trim to Time Range and give a start time and a duration in seconds or HH:MM:SS.sss, and only that section is encoded. That is also the quickest way to test a quality setting on a long file before committing to the whole thing. If you would rather cut the source visually first, video-cutter accepts RealMedia files directly.
How are my files handled during the conversion?
Your RM file is uploaded over an encrypted connection, processed on our servers and deleted automatically after a few hours. Files are never shared or made public, there is no sign-up and no watermark. RealMedia clips are small by modern standards, so upload time is rarely the bottleneck here.