RMVB to MTS Converter

RMVB to MTS — and Whether MTS Is the Right Target

RMVB is the variable-bitrate flavour of RealMedia that an entire era of fansubbed shows, film rips and downloaded archives shipped in. If you are pulling one of those .rmvb files into a camcorder-style editing workflow, this converts it to MTS by re-encoding RealVideo to H.264 inside an MPEG transport stream. Be honest about the goal first, though: MTS only earns its place inside an AVCHD or NLE pipeline that expects .mts files. If you just want the video to play, RMVB to MP4 is the better target; if you only want the soundtrack, RMVB to MP3 pulls it out directly. The comparison below shows why.

RMVB vs MTS at a Glance

What ".mts" From This Converter Actually Is

Worth being precise, because the .mts / .m2ts distinction confuses a lot of people and most converters gloss over it. What you get here is a plain MPEG transport stream: 188-byte packets, each beginning with the standard 0x47 sync byte, carrying H.264 video and — unless you change it — AAC audio. That is the same framing a camcorder writes to the .mts files inside an AVCHD card, and it is what an editor that recognises the extension expects.

What it is not is a disc structure. A camcorder card carries a whole BDMV/STREAM folder tree, and one loose file cannot reproduce that. Nor is our default audio AVCHD-legal: the AVCHD specification calls for Dolby AC-3 or LPCM, so if you are feeding a pipeline that validates against the spec rather than just reading the file, switch Audio Codec to AC3 before converting.

When MTS Is the Right Choice

• Your editor or camcorder-import tool auto-detects .mts as AVCHD footage and treats it as native HD source rather than prompting for a transcode.
• Your pipeline specifically wants H.264 video with AC-3 audio — set Audio Codec to AC3 to match the AVCHD specification.
• You are matching the container of existing camcorder clips so everything sits on one timeline without per-clip conversion prompts.
• You need a transport stream rather than a file-based container — TS is designed to survive being cut and concatenated at packet boundaries.

When You Want MP4 or MP3 Instead

• You just want it to play. MP4 with H.264 and AAC opens on essentially every phone, browser, smart TV and editor; a loose .mts does not. RMVB to MP4 is the right call for most people converting an old Real archive.
• You only need the audio — a song, a lecture, a dub track. RMVB to MP3 extracts it without carrying the video.
• You are archiving rather than editing. MP4 carries the same H.264 video with less container overhead and far better long-term tool support.

How to Convert RMVB to MTS

1. Upload Your RMVB File: Drag and drop your .rmvb file or click "+ Add Files". Batch upload works — queue several clips and they convert under the same settings, over an encrypted connection.
2. Confirm the Video and Audio Codec: Video Codec opens on H.264 and Audio Codec on AAC. Leave H.264 alone for editor compatibility; switch Audio Codec to AC3 if your pipeline wants true AVCHD audio.
3. Set Compression and Resolution (Optional): File Compression opens on Quality Preset at "Very High (Recommended)"; with H.264 selected, Constant Quality and Constraint Quality expose a CRF slider on the 16–51 scale that opens at 23. Leave Video resolution on "Keep original" for SD Real sources, and use Trim for a single time range.
4. Convert and Download: Click "Convert" and download your .mts file. No sign-up, no watermark.

Frequently Asked Questions

Should I convert my RMVB to MTS or to MP4?

For most people, MP4. MTS earns its place only inside an editing or camcorder-import workflow where a tool keys off the .mts extension and treats the file as native HD footage — a narrow reason. For general playback, sharing or archiving, RMVB to MP4 gives you a file that opens on virtually any device, carries the same H.264 video, and has less container overhead. Pick MTS only when a specific pipeline asks for it.

What is the difference between MTS and M2TS, and which do I need?

Framing, and we checked it at the byte level on both outputs. Both carry the same H.264 video, but .mts comes out as a plain transport stream — 188-byte packets with the 0x47 sync byte at the very start of the file — while .m2ts uses BDAV framing, prefixing each 188-byte packet with a 4-byte arrival timestamp for 192-byte packets, which pushes the first sync byte to offset 4. Camcorders write .mts on the card and Blu-ray-style structures use .m2ts. If your tool expects Blu-ray/BDAV input, use RMVB to M2TS instead; if it expects camcorder footage, stay here.

Is the .mts file this creates a real AVCHD file?

Partly. The video framing matches — a plain 188-byte MPEG transport stream carrying H.264 — which is what most editors actually check. Two things fall short of the full specification: a single file is not the BDMV/STREAM folder structure an AVCHD card carries, and the default AAC audio is not what AVCHD calls for, since the specification uses Dolby AC-3 or LPCM. Switching Audio Codec to AC3 closes the audio gap. If a device flatly rejects the file, it is almost always validating the folder structure rather than the stream.

Will converting RMVB to MTS improve the video quality?

No. RealVideo inside an RMVB is lossy and those losses are permanent — re-encoding to H.264 cannot rebuild detail the original discarded, and the H.264 pass adds its own second, smaller round of loss. A clip distributed at a low variable bitrate will look just as soft in MTS. What you gain is an editable modern H.264 stream, not a sharper picture; use a high Quality Preset, or a CRF around 18–20, so the re-encode stays close to the source.

My RMVB is only 320×240-ish — should I upscale it to 1080p?

No. RMVB existed to keep movies and TV episodes small enough to download over slow connections, so most archives sit at SD resolutions. Upscaling to 1080 interpolates pixels and bloats the file without adding real detail, and resizing has a second cost: any scale normalises the pixel aspect to square, so an anamorphic source can come out geometrically wrong. Leave Video resolution on "Keep original" and let the editor scale on the timeline if it needs to.

Does the RealAudio soundtrack carry over cleanly to MTS?

Not as-is — it is re-encoded, as everything here is. RMVB carries RealAudio, usually the Cook codec, which no transport-stream pipeline uses, so the audio is converted to AAC by default or AC3 if you select it. Because RealAudio is already lossy, that is a second lossy pass; pick a high quality setting to keep it transparent. If the audio is all you want, RMVB to MP3 extracts it directly without the video round-trip.

Which audio codec should I pick for MTS — AAC, AC3, or one of the others?

AC3 if the file is going into an AVCHD-conformant pipeline, AAC otherwise. The page also offers EAC3, DTS, MP2 and MP3: MP2 is the legacy broadcast choice for transport streams, DTS and EAC3 only make sense if a receiver downstream specifically wants them, and MP3 in a transport stream is widely supported but has no advantage over AAC here. Since the source is a lossy RealAudio track, none of the exotic options will sound better than a well-set AAC or AC3 encode.

Why does my RMVB refuse to convert at all?

The most common cause is DRM. Many paid 2000s RealMedia downloads were encrypted, and no server-side converter can decode a protected stream — that needs the original DRM-licensed player. A corrupted or partially downloaded archive is the other common cause; open it in VLC first, and if VLC stops at the same point, the source is the blocker. Plain, unprotected RMVB — the kind most fansub-era archives use — converts without trouble. It is worth migrating these files now: RealVideo and RealAudio decoding survives today mainly through open-source projects such as FFmpeg, whose decoder table covers RealVideo 1.0 through 6.0 and the whole RealAudio family, rather than through RealNetworks' own software. Your upload is encrypted in transit, processed on our servers, and deleted automatically after a few hours. If you need the reverse direction, MTS to RMVB re-encodes camcorder footage back into the RealMedia container.