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WMA (Windows Media Audio) is Microsoft's proprietary audio codec, introduced in 1999 as a competitor to MP3 and RealAudio. WMA encodes audio at 32-320 kbps in the ASF (Advanced Systems Format) container, and was tightly integrated into Windows Media Player and the Windows ecosystem throughout the 2000s. RM (RealMedia) files contain audio encoded with RealNetworks' competing proprietary codecs — Cook (RA8) and ACELP variants — also from the late 1990s.
Converting RM to WMA moves audio between two proprietary codec ecosystems from the same era. While both are legacy formats, WMA retains one advantage: native Windows support. Windows Media Player can play WMA natively, whereas it has never supported RM. For users with Windows-centric media libraries, WMA may be the preferred target.
Windows Media Player handles WMA natively — no plugins, no codecs, no third-party software required. This matters in environments where Windows is the standard platform and installing additional software is restricted (enterprise desktops, kiosk systems, institutional computers). Converting RM audio to WMA enables playback on any Windows machine without configuration.
That said, WMA is itself a fading format. AAC and MP3 have far broader cross-platform support. WMA conversion is primarily relevant for Windows-only environments or legacy Windows media library management. For general-purpose audio, AAC or MP3 are better choices.
FFmpeg demuxes the RM container and decodes the RealAudio stream (Cook, ACELP, or other variants) to PCM. The audio is re-encoded using the WMA v2 encoder (wmav2) at 128 kbps in an ASF container with the .wma extension. Sample rate is preserved from the source. WMA v2 is chosen for maximum Windows compatibility — WMA Pro offers better quality but requires newer Windows Media Player versions.
WMA at 128 kbps preserves the full quality of the decoded RM audio without further degradation. Since RM audio was typically 32-96 kbps RealAudio, the WMA output bitrate comfortably exceeds the source quality. At 96 kbps WMA, quality is already transparent relative to the RM source for speech content. WMA and AAC produce comparable quality at equivalent bitrates — neither significantly outperforms the other.
| Device | RM | WMA |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| 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
RM to WMA conversion is a Windows-specific migration path for legacy RealAudio content. While WMA is itself a legacy format, its native Windows support makes it practical for enterprise and institutional environments where Windows Media Player is the standard playback tool.
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| Fitur | RM | WMA |
|---|---|---|
| Nama Lengkap | RealMedia | Windows Media Audio |
| Ekstensi | .rm | .wma |
| Terbaik Untuk | Streaming format | Windows native |