RMVB to MP4 (H.264) - Online Video Converter
Convert RMVB to MP4 (H.264) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About RMVB to MP4 (H.264)
Convert RMVB to MP4. RMVB adds variable bitrate to the RealMedia container for smaller downloads. MP4 pairs H.264 video with AAC audio in the ISO base media container. H.264 has no alpha channel, so transparency is dropped..
Why convert RMVB to MP4 (H.264)?
- Smaller files with MP4 lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
RMVB vs MP4 (H.264)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | No |
| Compression | lossy | lossy |
| Typical use | RMVB adds variable bitrate to the RealMedia container for smaller downloads. | MP4 pairs H.264 video with AAC audio in the ISO base media container. |
When not to convert RMVB to MP4 (H.264)
- Skip MP4 for archival masters: lossy compression discards detail, so keep the RMVB original.
- Keep a master copy: repeated exports stack small losses, so archive RMVB before batch MP4 shares.
Limits
Starting point: RMVB - RMVB adds variable bitrate to the RealMedia container for smaller downloads. Variable-bitrate seeking can drift; verify sync after conversion. H.264 has no alpha channel, so transparency is dropped. Encode MP4 (H.264 / AAC) from RMVB at a bitrate near the source, and confirm the audio track before converting.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.