RM to AMR - Convert audio online
Conversion Results:
| # | Output File | Source File | Action |
|---|
How to convert RM to AMR:
1. Click the "Choose Files" button to select multiple files on your computer or click the "URL" button to choose an online file from URL, Google Drive or Dropbox. The source file can also be video format. Video and audio file size can be up to 200M. You can use file analyzer to get source audio's detailed information such as track name, genre, bitrate and sampling rate.
2. Set target audio format, bitrate and sample rate. The target audio format can be WAV, WMA, MP3, OGG, AAC, AU, FLAC, M4A, MKA, AIFF, OPUS or RA.
3. Click the "Convert Now!" button to start batch conversion. It will automatically retry conversion on another server if one fails, please be patient while converting. The output files will be listed in the "Conversion Results" section. Click icon to show file QR code or save file to cloud storage services such as Google Drive or Dropbox.
RM vs AMR:
| Name | RM | AMR |
| Full name | RealMedia | Adaptive Multi-Rate |
| File extension | .rm, .rmvb | .amr, .3ga |
| MIME | application/vnd.rn-realmedia | audio/amr |
| Developed by | RealNetworks | 3GPP |
| Type of format | Multimedia container format | Audio compression format |
| Introduction | RealMedia is a proprietary multimedia container format created by RealNetworks. Its extension is ".rm". It is typically used in conjunction with RealVideo and RealAudio and is used for streaming content over the Internet. Typically these streams are in CBR, but a container for VBR streams, named RMVB, has been developed. | The Adaptive Multi-Rate (AMR or AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1999 and is now widely used in GSM and UMTS. |
| Technical details | Support of RealMedia is available in a few multimedia players for different architectures/platforms, including RealPlayer, the Real Alternative codec pack and the open source DAP firmware Rockbox. | AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200-3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s. Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to 200-3400 Hz. |
| Associated programs | RealPlayer | Audacity, FFmpeg, MPlayer, QuickTime, VLC media player |
| Sample file | sample.rm | sample.amr |
| Wikipedia | RM on Wikipedia | AMR on Wikipedia |