Convert RMVB to M2TS — Free Online Tool
Convert RMVB files to M2TS (Blu-ray BDAV) format by re-encoding the RealMedia video stream into H.264 and packaging it into an MPEG-2 Transport Stream container — making legacy RealNetworks content compatible with Blu-ray players, AVCHD workflows, and broadcast pipelines. The conversion runs entirely in your browser with no file uploads required.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your RMVB file here
or click to browse
Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
RMVB files use RealNetworks' proprietary RealVideo codec, which is not natively supported by the M2TS container. This means the video stream cannot simply be remuxed — it must be fully re-encoded from RealVideo into H.264 (libx264), which is the standard video codec for Blu-ray and AVCHD. Similarly, the audio (typically RealAudio) is transcoded into AAC, which is broadly compatible with the M2TS/BDAV specification. The output is wrapped in an MPEG-2 Transport Stream, a packetized container designed for reliable playback from optical disc and broadcast environments. Because both the video and audio streams are fully re-encoded, processing time depends on the length and resolution of the source RMVB file.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program — the open-source multimedia processing engine that handles reading the RMVB container, decoding RealVideo and RealAudio streams, re-encoding them, and writing the M2TS output. |
-i input.rmvb
|
Specifies the input file in RMVB format. FFmpeg reads the RealMedia Variable Bitrate container and demuxes the proprietary RealVideo and RealAudio streams for decoding before re-encoding begins. |
-c:v libx264
|
Re-encodes the video stream using the libx264 H.264 encoder. This is required because RealVideo — the native codec in RMVB — is not a valid codec for the M2TS container, so a full decode-and-reencode is performed. |
-c:a aac
|
Transcodes the audio stream into AAC using FFmpeg's built-in encoder. RealAudio from the RMVB source is not compatible with M2TS, and AAC is the default audio codec for BDAV/M2TS workflows with broad device support. |
-crf 23
|
Sets the Constant Rate Factor for the libx264 encoder to 23, the default balance between quality and file size. Lower values (e.g., 18) yield higher quality H.264 output from the RealVideo source at the cost of a larger M2TS file. |
-b:a 128k
|
Sets the AAC audio output bitrate to 128 kilobits per second. This is a standard quality level for stereo audio; for RMVB sources with higher-quality or multichannel audio, increasing this to 192k or 256k is recommended. |
output.m2ts
|
Defines the output filename and tells FFmpeg to write an MPEG-2 Transport Stream file using the BDAV (.m2ts) container, which packages the re-encoded H.264 video and AAC audio into 188-byte TS packets compatible with Blu-ray and AVCHD systems. |
Common Use Cases
- Archiving old RMVB anime or film downloads into a Blu-ray-compatible format for playback on a standalone Blu-ray player or PlayStation console
- Importing RMVB-sourced content into AVCHD-based video editing workflows that require an MPEG-2 Transport Stream container
- Converting a library of RMVB TV recordings into M2TS for use with media server software that indexes Blu-ray disc structures
- Preparing RealMedia video content for broadcast or digital signage systems that mandate MPEG-TS delivery
- Migrating legacy RealNetworks video content to a long-term archival format with widely supported H.264 video and AAC audio
- Getting an FFmpeg command to batch-process a large collection of RMVB files on a desktop machine for files exceeding the 1GB browser limit
Frequently Asked Questions
Yes — this conversion is lossy because the source RealVideo codec must be fully re-encoded into H.264, and RealAudio is re-encoded into AAC. Any transcoding between lossy codecs introduces some generation loss. The default CRF value of 23 for libx264 produces visually good results for most content, but if your source RMVB was already heavily compressed, artifacts may become more apparent. Lowering the CRF value (e.g., to 18) will improve quality at the cost of a larger output file.
RMVB (Real Media Variable Bitrate) was specifically designed for efficient compression at very low bitrates, making it popular for distributing video over slow connections. H.264 in an M2TS container is optimized for quality and compatibility rather than minimum file size, so even at the same perceived quality level the output will typically be larger. The MPEG-2 Transport Stream container itself also adds packetization overhead compared to the compact RealMedia container.
M2TS using H.264 video and AAC audio is compatible with most Blu-ray players and the PlayStation 3/4, but standalone players vary in which audio codecs they support — some require Dolby or DTS audio rather than AAC for disc-based playback. For guaranteed disc compatibility, you may need to further author the M2TS into a proper BDMV folder structure. For software players like VLC or Kodi, the output should play back without issue.
The M2TS container does support subtitle tracks, but because RMVB does not carry subtitle streams in a format FFmpeg can extract during this conversion, no subtitles will be present in the output. If you have a separate subtitle file (such as an SRT or ASS file) for your RMVB content, you can add it to the FFmpeg command manually using the '-i subtitle.srt' and '-c:s copy' flags before the output filename.
To improve video quality, lower the '-crf' value — for example, '-crf 18' produces near-visually-lossless H.264 output but increases file size significantly. To reduce quality and save space, raise it toward '-crf 28'. For audio, replace '-b:a 128k' with a higher bitrate like '-b:a 192k' or '-b:a 256k' for better AAC fidelity. These changes can be made directly in the FFmpeg command displayed on this page before copying it for local use.
The browser tool processes one file at a time, but the displayed FFmpeg command is easy to adapt for batch processing on your desktop. On Linux or macOS you can run: 'for f in *.rmvb; do ffmpeg -i "$f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "${f%.rmvb}.m2ts"; done'. On Windows using PowerShell: 'Get-ChildItem *.rmvb | ForEach-Object { ffmpeg -i $_.Name -c:v libx264 -c:a aac -crf 23 -b:a 128k ($_.BaseName + ".m2ts") }'. This is especially useful for large collections or files over 1GB.
Technical Notes
RMVB files rely on RealNetworks' proprietary RealVideo 8, 9, or 10 codec, none of which are supported natively within M2TS. This makes a full transcode unavoidable — unlike MKV-to-M2TS conversions where H.264 streams can sometimes be remuxed. The libx264 encoder used here produces a High Profile H.264 stream by default, which is broadly compatible with Blu-ray hardware and software players. AAC audio at 128k is sufficient for stereo content but may be underwhelming for surround-sound RMVB sources encoded with multichannel RealAudio — in those cases, raising the audio bitrate to 192k or 256k is advisable. Note that M2TS supports multiple audio tracks, but since RMVB does not, only a single audio track will appear in the output. Metadata such as title tags embedded in the RealMedia container is generally not transferred to M2TS during this conversion. The MPEG-2 Transport Stream container adds fixed-size 188-byte packet overhead, which contributes to the output file being larger than a comparable MP4 or MKV at the same codec settings.