Convert RealMedia Variable Bitrate (.rmvb) to MPEG-4 Part 14 (.mp4) online for free. Fast, secure video conversion with no watermarks or registration.
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MP4 (MPEG-4 Part 14) is the universal video format — supported by every web browser, smartphone, smart TV, social media platform, and media player on every operating system. RMVB was once hugely popular in China and Southeast Asia for distributing movies at 400-700 MB with variable bitrate encoding that allocated more bits to action scenes and fewer to static shots. Converting RMVB to MP4 is arguably the single most important migration for the millions of RMVB files still circulating in Asian media archives.
RMVB requires RealPlayer or specialized decoders that are increasingly unavailable. RealNetworks effectively abandoned the format, and no modern platform supports it natively. MP4 with H.264 plays everywhere — literally every device manufactured since 2010. This conversion rescues RMVB content from obsolescence and makes it permanently accessible.
FFmpeg decodes the RealVideo 8/9/10 stream and RealAudio track, then re-encodes to H.264 High Profile with AAC-LC audio. CRF 22 with the 'slow' preset maximizes compression efficiency. The MP4 container uses 'isom' brand for universal compatibility with moov atom at the file start. Variable bitrate encoding naturally preserves RMVB's efficient approach to bit allocation.
H.264 at CRF 22 produces significantly better quality than the original RMVB encoding at similar file sizes. RealVideo 9/10, while impressive for its era, is roughly half as efficient as H.264. The MP4 output typically looks cleaner with sharper detail, especially in motion sequences that challenged RealVideo's encoder.
| Device | RMVB | MP4 |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
RMVB to MP4 is the definitive migration for the RealMedia era's vast content library. The output is universally playable, typically better quality than the original, and future-proof for decades to come. Every RMVB file should eventually make this journey.
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| Native |
| 特徴 | RMVB | MP4 |
|---|---|---|
| 正式名称 | RealMedia Variable Bitrate | MPEG-4 Part 14 |
| 拡張子 | .rmvb | .mp4 |
| 最適な用途 | Variable bitrate | Universal compatibility |