AMR to M4A: Convert Audio from AMR(Adaptive Multi-Rate) to M4A(MPEG-4 Audio) with River Past Audio Converter, AMR2M4A converter, conversion

What is AMR?

Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1998 and is now widely used in GSM. It uses link adaptation to select from one of eight different bit rates based on link conditions.

To decode AMR audio, you need to have Apple QuickTime installed.

What is M4A?

Because of its exceptional performance and quality, Advanced Audio Coding (AAC) is at the core of the MPEG-4, 3GPP and 3GPP2 specifications and is the audio codec of choice for Internet, wireless and digital broadcast arenas. AAC provides audio encoding that compresses much more efficiently than older formats, such as MP3, yet delivers quality rivaling that of uncompressed CD audio.

To encode MPEG-4 audio, you need to have River Past MPEG-4 Booster Pack in addition to your audio software.

Additional Requirements 

To convert from AMR(Adaptive Multi-Rate) to M4A(MPEG-4 Audio) audio with River Past Audio Converter, you must have River Past MPEG-4 Booster Pack installed.

Launch River Past Audio Converter

Once River Past Audio Converter is installed properly, launch Audio Converter.

Add File

Click on the "Add File" button on the tool bar. The standard file open dialog appears. Select "AMR - Adaptive Multi-Rate" in its "Files of type" combo box.

Note: To convert from AMR files, you must have QuickTime installed.

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Select output format

Use the setting panel on the bottom of the window to control the output format. Click on the toggle to the left of the "Format" label to expand the panel. Select "M4A - MPEG-4 Audio" as the "Audio Type".

Troubleshoot

If you have MPEG-4 Booster Pack installed, but don't see M4A as an output option, you have a problem with QuickTime installation.

Please make sure you have the latest QuickTime installed. Occasionally, QuickTime may be corrupted due to conflict with some other software. In any case, reinstalling QuickTime should fix this problem.

You can change the sample rate, channel (stereo or mono) and bits/sample, and bitrate.

Note: To convert to MPEG-4 audio, you must have River Past MPEG-4 Booster Pack installed.

Select output directory

Expand the "Output Directory" panel. Use the "Browse" button to select an output directory.

Convert

Click the "Convert" button on the tool bar.

River Past Audio Converter