AAC to M4A: Convert Audio from AAC(Advanced Audio Coding) to M4A(MPEG-4 Audio) with River Past Audio Converter, AAC2M4A converter, conversion
Audio Coding, is a technique for compressing digital audio files. Officially
part of the MPEG-4 standard,
it is most widely used to create small digital audio files.
AAC is conceptually similar to the ubiquitous MP3 format. AAC is a lossy
algorithm, meaning the original digital audio cannot be recreated from the compressed
bits alone. In terms of audio fidelity, however, there is no loss of data if
the compressed audio is properly encoded. AAC claims an advantage over MP3 in
this regard: while MP3 requires a bit rate of approximately 256 kilobits per
second (kbps) to achieve transparency, AAC can achieve the same quality at 128
kbps. This allows AAC files to be roughly half the size of MP3 files of the
same quality, and one-tenth the size of CD digital data.
AAC provides several other advantages over MP3. It is capable of handling
much higher and lower frequencies of sound, provides up to 48 channels of audio,
and allows the creation of low-latency audio necessary for two-way communication.
There are two types of AAC files. The most common one is embedded in MPEG-4
container. Its file extension is usually m4a. The popular iTunes encode
AAC audio in this format. You only need to have Apple QuickTime
installed to decode these files.
A less common one is the plain AAC file, usually with .aac file extension.
To convert from this type, you need to have DC-Bass
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.
To convert from AAC(Advanced Audio Coding) 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.
Click on the "Add File" button on the tool bar. The standard file open dialog appears. Select "AAC - Advaned Audio Coding" in its "Files of type" combo box.
Note: To convert from AAC files, you must have DC-Bass Decoder installed.
River Past Audio Converter
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".
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.
Click the "Convert" button on the tool bar.
River Past Audio Converter