ALAC to MPA: Convert Audio from ALAC(Apple Lossless) to MPA(MPEG Audio) with River Past Audio Converter, ALAC2MPA converter, conversion
What is
ALAC?
Apple Lossless (also known as Apple Lossless Encoder, ALE, or Apple Lossless Audio Codec, ALAC) is an audio codec developed by Apple Inc. for lossless data compression of digital music.
Apple Lossless data is stored within an MP4 container with the filename extension .m4a. While Apple Lossless has the same file extension as AAC, it is not a variant of AAC, but uses linear prediction similar to other lossless codecs such as FLAC and Shorten.[1] iPods with a dock connector (not the Shuffle) and recent firmware can play Apple Lossless-encoded files. It does not utilize any digital rights management (DRM) scheme, but by the nature of the container, it is thought that DRM can be applied to ALAC much the same way it can with other files in QuickTime containers.
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.
To encode MPEG Audio, you will need River
Past MPEG-2 Booster Pack in addition to your audio software.
Additional Requirements
To convert from ALAC(Apple Lossless) to MPA(MPEG Audio) audio with River Past Audio Converter, you must have River Past MPEG-2 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 "ALAC - Apple Lossless (*.alac)" 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.
If you cannot add the ALAC file, you may need to install QuickTime. We use QuickTime to decode compressed AIFC files.
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 "MPA - MPEG Layer-2" as the "Audio Type".
You can change the sample rate, channel (stereo or mono) and bits/sample, and bitrate.
Note: The MPEG-2 Booster Pack must be installed for the "MPA - MPEG Layer-2" output option to show.
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
