AVI to MPA: Extract Audio from AVI(Audio Video Interleaved) Video to MPA(MPEG Audio) with River Past Audio Converter, AVI2MPA converter, conversion

What is AVI?

Defined by Microsoft, AVI stands for Audio Video Interleave. It is a special case of the RIFF (Resource Interchange File Format). AVI is the most common format for audio/video data on the PC.

AVI is Microsoft's response to Apple's QuickTime technology. Early AVI files were limited on choice of video and audio codecs, quality, and resolution. However, with the introduction of DirectShow, AVI became a very flexible and powerful architecture. Some newer codecs including DivX and XviD enable AVI files to have similar or even better quality than DVD.

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 extract audio from AVI(Audio Video Interleaved) video to MPA(MPEG 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 "AVI - Audio Video Interleave" 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.

AVI is a file container format. It may use standard Windows codecs, or any of the third party codecs. If it uses a third party audio codec, you need to have the codec installed on your system for River Past Audio Converter to decode the file.

If you get an error when adding an AVI file, please open it in Windows Media Player and see if you can play it with audio. If not, you must find out what audio compression is used in the file and download the codec.

If you cannot add the AVI file, it may contain video and audio which use codecs not installed on your system. You can verify that by playing the AVI in Windows Media Player.

If WMP cannot play the file, the codecs absent. You will need to find out which codecs are used to encode the AVI and install them.

Usually, you can install ffdShow, which is compatible with many video compression, including DivX and Xvid. For audio, you may need to install AC-3 Decoder Filter or CoreAAC.

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.