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AVI to MP3: Extract Audio from AVI(Audio Video Interleaved) Video to MP3(MPEG Layer-3) with River Past Audio Converter, AVI2MP3 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 MP3?

MP3 is a digital audio compression algorithm that acheives a compression factor of about twelve while preserving sound quality. It does this by optimising the compression according to the range of sound that people can actually hear. MP3 is currently (July 1999) the most powerful algorithm in a series of audio encoding standards developed under the sponsorship of the Moving Picture Experts Group (MPEG) and formalised by the International Organization for Standardization (ISO).

MP3 is very different from Layer 2, using an additional MDCT layer to increase frequency resolution. Its scale factor groups are more optimised for the human ear, and it uses nonlinear sample quantisation and Huffman coding. MP3 files (filename extension ".mp3") can be downloaded from many World-Wide Web sites and can be played using software available for most operating systems (also downloadable), e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for Unix. MP3 files are usually downloaded completely before playing but streaming MP3 is also possible. A program called a "ripper" can be used to copy a selection from a music CD onto your hard disk and another program called an encoder can convert it to an MP3 file.

Windows ships with limited MP3 encoding support. The output sample rate is limited to 24khz and the bitrate is limited 56kbps. However, many add-on packages from open source community make it possible to encode at higher sample rate and bitrate.

A commonly used open source codec is LAME. LAME comes in different forms, including a ACM (Audio compression manager) codec and a DLL (lame_enc.dll). Caution: LAME ACM does not work well on many computers, regardless which software is loading it. It is best to avoid installing LAME ACM and use lame_enc.dll instead.

MPEG.ORG is an excellent source for additional information on MPEG format and usage.

When you encode MP3 audio, we recommend you to install lame_enc.dll.



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 "MP3 - MPEG Layer-3" as the "Audio Type".


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

Note: The standard MPEG Layer-3 audio compressor is limited to maximum 24khz and 56kbps. Please install Lame_enc.dll for higher sample rate and bitrate.


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


   AVI to 3G2
   AVI to 3GP
   AVI to AIF
   AVI to AVI
   AVI to DIVX
   AVI to DV
   AVI to GIF
   AVI to JPEG
   AVI to M4A
   AVI to MKV
   AVI to MOV
   AVI to MP3
   AVI to MP4/M4V
   AVI to MPA
   AVI to MPEG-1
   AVI to MPEG-2
   AVI to OGG
   AVI to OGM
   AVI to RA
   AVI to RM
   AVI to VOB
   AVI to WAV
   AVI to WMA
   AVI to WMV
   AVI to XVID
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