Convert RealMedia Variable Bitrate (.rmvb) to Free Lossless Audio Codec (.flac) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .rmvb file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flac file when it's ready.
FLAC (Free Lossless Audio Codec) is the open-source standard for lossless audio compression, achieving 30-50% size reduction with perfect bit-for-bit reconstruction. RMVB audio tracks use RealAudio codecs at typically 64-128 kbps — already lossy. Extracting to FLAC preserves the decoded audio without any additional loss, creating a stable lossless master from which any future format can be derived.
FLAC provides a lossless audio extraction from RMVB — essential when the audio needs to pass through multiple processing stages (editing, effects, format conversion) without compounding lossy artifacts. FLAC is universally supported on Windows 10+, Linux, Android, and all professional audio software, making it the ideal intermediate format.
FFmpeg decodes the RealAudio stream (Cook/RA8, AAC/RA9, or HE-AAC/RA10) and passes raw PCM samples to the FLAC encoder. The encoder applies linear prediction analysis and Rice entropy coding to achieve lossless compression. Output preserves the source sample rate (typically 44.1 kHz) and bit depth (16-bit).
FLAC output is a perfect lossless copy of the decoded RealAudio. The quality ceiling is set by the original RMVB audio encoding, but no additional degradation occurs. Every PCM sample from the decoder is preserved exactly.
| Device | RMVB | FLAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| 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 FLAC extraction creates an archival-quality audio copy in an open, lossless format. While RMVB audio is already lossy, FLAC ensures that the decoded quality is preserved without any compounding loss.
安全传输
HTTPS 加密上传
隐私优先
文件处理后自动删除
无需注册
即刻开始转换
随处可用
任何浏览器，任何设备
| No |
| 特性 | RMVB | FLAC |
|---|---|---|
| 全称 | RealMedia Variable Bitrate | Free Lossless Audio Codec |
| 扩展名 | .rmvb | .flac |
| 最适合 | Variable bitrate | Lossless compression |