Free online RMVB to MTS converter

RMVB files often need conversion because modern video editors, televisions, and AVCHD-compatible hardware may not accept the older RealMedia container. MTS stores compatible transport-stream video and is commonly used by AVCHD camcorders and Blu-ray-related workflows.

What the RMVB format is

RMVB means RealMedia Variable Bitrate. It is a RealNetworks container designed to reduce file size by varying the bitrate across scenes, commonly carrying RealVideo and RealAudio streams.

You may encounter RMVB files created with RealProducer or distributed for playback in RealPlayer and other software with RealMedia codec support. Many current editors and hardware players lack native RMVB support, especially for files encoded with older RealVideo variants.

What the MTS format is

MTS is an MPEG-2 Transport Stream file, usually associated with AVCHD recordings from digital camcorders. It commonly contains H.264 video with AC-3 or LPCM audio and uses 1920×1080 or 1280×720 video in a 48 kHz production workflow.

MTS is useful for camera-compatible archives, Blu-ray-oriented authoring, and editors that expect an AVCHD transport stream. The .mts extension alone does not guarantee AVCHD compliance: a valid AVCHD recording also depends on codec profile, bitrate, audio format, and sometimes the original camera folder structure.

How to convert RMVB to MTS

FFmpeg is the most controllable desktop option. Install a current FFmpeg build, place the source file in an accessible folder, and inspect its streams with:

ffprobe "input.rmvb"

For a broadly compatible H.264 MTS file, run:

ffmpeg -i "input.rmvb" -map 0:v:0 -map 0:a:0? -c:v libx264 -preset medium -crf 20 -profile:v high -level 4.1 -pix_fmt yuv420p -c:a ac3 -b:a 192k -ar 48000 -f mpegts "output.mts"

This decodes the RMVB streams and re-encodes them as H.264 video and AC-3 audio inside an MPEG transport stream. Lower the CRF value for higher video quality and a larger file; values around 18–23 are typical. Use -c:a aac -b:a 192k instead of AC-3 if the receiving editor specifically requires AAC.

To convert without installing software, upload the file to the free converter on 101convert.com, choose MTS as the output format, start the conversion, and download the resulting file.

Quality and compatibility limits

RMVB-to-MTS conversion normally requires re-encoding because RealVideo is not a standard video codec for AVCHD transport streams. Re-encoding can reduce quality, and an MTS file cannot recover detail already lost in the RMVB source.

The command preserves the source dimensions unless you add a scaling filter. If the source has unusual dimensions, some devices may reject it; add a compatible filter such as -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2" when a 1280×720 output is required.

Some cameras and authoring applications require a complete AVCHD directory, not an isolated .mts file. In that case, use the application’s AVCHD authoring or import function after conversion and verify the required resolution, frame rate, H.264 profile, bitrate, and audio format.