RM to AVCHD Converter

Convert RM to AVCHD

RM is RealNetworks' RealMedia container — RealVideo and RealAudio, sized for the bandwidth of the early 2000s. AVCHD is the camcorder format Sony and Panasonic introduced in 2006: H.264 video and Dolby AC-3 audio carried in an MPEG-2 transport stream. This page decodes the RealMedia streams and re-encodes them into that combination.

It is worth being precise about what "converting to AVCHD" can and cannot mean, because AVCHD is a recording specification rather than just a file type. A converter produces the stream an AVCHD device would record; it cannot produce the folder structure a camcorder writes onto its card. What that means in practice is set out below, along with the one rename that makes the file more useful.

How to Convert RM to AVCHD

1. Upload Your RM File: Drag the .rm file onto the page or click "Add Files". Multiple clips can be queued and convert with the same settings. Uploads travel over an encrypted connection and are processed on our servers.
2. Review the Codecs — There Is Nothing to Change: Video Codec lists H.264 and nothing else. Audio Codec lists AC3 and nothing else. That is unusual on this site and it is deliberate: those are the two codecs the AVCHD specification actually permits, so the page does not offer you a way to produce a file that contradicts its own extension.
3. Set File Compression and Video Resolution: Compression opens on Quality Preset at Very High (Recommended), with Specific file size, Constant Bitrate, Variable Bitrate, Constant Quality and Constraint Quality beside it. Video resolution opens on Keep original; use Preset Resolutions or Width x Height if a device expects 1440×1080 or 1920×1080.
4. Convert and Download: Click Convert and save the .avchd file. No sign-up, no watermark; uploads and outputs are deleted automatically after a few hours.

One Codec Each, and Both Are the Spec-Legal Ones

Most video pages here give you six or seven video codecs and as many audio codecs. This one gives you one of each, and the reason is that AVCHD is narrow by design:

That last row is the honest limit of any converter. AVCHD on a camcorder card is a directory structure with index and playlist files around the video; what you get here is the video stream itself. Editors that import AVCHD by stream file will take it happily; software that expects to mount a card structure will not.

We ran a RealMedia clip through the same H.264-plus-AC-3 transport-stream path this page uses and probed the result: one h264 video stream at the source frame size and one ac3 audio stream, inside an mpegts container. That is the shape of every file this page produces.

What the File Is at Byte Level — and the Rename That Helps

.avchd is not an extension FFmpeg recognises on its own, so the pipeline forces the MPEG transport-stream muxer explicitly. We verified what comes out by reading the first bytes of the file, and by encoding the identical source to the neighbouring extensions for comparison:

The practical consequence: renaming your .avchd file to .mts is completely safe, because the bytes are identical, and many editors recognise .mts when they do not recognise .avchd. Renaming it to .m2ts is not equivalent — that framing is genuinely different, and the four-byte prefixes are not in your file. If BDAV framing is what a tool needs, use the RM to M2TS page, which writes it properly.

Frequently Asked Questions

Can I copy this file onto a camcorder's memory card and have the camera play it?

Almost certainly not. Camcorders read their own card structure — a BDMV directory with index, playlist and clip-information files that the camera itself wrote — and they validate what they find fairly strictly. Dropping a stream file into that structure does not create the accompanying index entries. Feed the file to an editor instead; that is where an AVCHD stream is genuinely useful.

Why can I not choose AAC or H.265 here?

Because they are not AVCHD. The specification names H.264 for video and AC-3 or linear PCM for audio, and a file that carried AAC or HEVC would be an ordinary transport stream wearing an AVCHD label. Other pages on this site give you the full codec range — RM to TS writes a transport stream with a wide choice of codecs, and RM to MP4 is the general-purpose target. This page stays narrow on purpose.

My editor will not import the .avchd file. What should I try?

Rename it to .mts first — the bytes are the same and that extension is far more widely recognised by editing software, because it is what camcorders write on card. If the editor still refuses, it is probably expecting a full AVCHD folder structure rather than a bare stream, in which case convert to MP4 or MOV instead. Neither costs you anything: the H.264 video is the same, only the wrapper changes.

Will the picture look better after converting an old RealMedia file to AVCHD?

No. Re-encoding cannot add detail that the RealVideo encoder discarded years ago, and it adds a second generation of loss on top. The default Very High preset keeps that second generation small — it targets a tight constant-quality value, and tighter still on small frames — which is also why the output is usually larger than the RealMedia source. Upscaling to 1080p makes this worse rather than better: it interpolates the existing pixels across more of them.

What resolution should I set?

Leave Video resolution on Keep original unless a downstream tool insists on a specific size. AVCHD material is normally 1440×1080 or 1920×1080, so an editor may be happier with one of those, in which case use Width x Height rather than a percentage. Be aware that resizing flattens the pixel aspect ratio to square pixels in this pipeline, so if the RealMedia source is anamorphic, enter the display dimensions you actually want.

Does converting to AVCHD deinterlace or clean up my old footage?

No. There is no deinterlacing anywhere in this pipeline, so an interlaced source keeps its comb artifacts and they are re-encoded into the H.264 stream. There is no noise reduction or restoration either. The conversion changes the codec and the container; it does not repair the picture.

What happens to the RealAudio track?

It is decoded and re-encoded as AC-3. RealMedia files carry RealAudio in several forms — the original 1.0 and 2.0 codecs, Cook, Sipro, ATRAC3 — and whichever is present gets decoded before the AC-3 encoder sees it. Because the source was a lossy low-bitrate stream, this is a lossy-to-lossy step; a high AC-3 bitrate cannot recover anything the original discarded, so there is no benefit in pushing it.

How are my files handled while they are on your servers?

The .rm file is uploaded over an encrypted connection, converted on our servers, and both the upload and the finished .avchd file are deleted automatically after a few hours. There is no account to create, no watermark, and files are never shared or made public. The practical limit on a long recording is upload size and time — the Video Cutter accepts .rm directly if you only need a section.