MPA to M4A: Convert Audio from MPA(MPEG Audio) to M4A(MPEG-4 Audio) with River Past Audio Converter, MPA2M4A converter, conversion
What is
MPA?
There are three "layers" in the MPEG-1
Audio specification.
In MPEG Audio Layer-1, a simple 32-subband audio compressor using a floating
point representation for subband samples. Resolution and scale factor are stored
for groups of 12 subsamples. MP1 is only used for Philips DCC Digital Compact
cassette with data rates of 384 kbps.
Both MPEG-1 and MPEG-2 files use MPEG-1
Audio Layer-2.
MPEG-1 Audio Layer-3 becomes
the widely popular MP3.
MPEG.ORG is an excellent source for additional
information on MPEG format and usage.
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 MPA(MPEG Audio) 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 "MPA - MPEG Audio" in its "Files of type" combo box.
Select the file you want to convert and click "Open". The file will be added to the conversion file list.
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".
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
