Datasheet

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MPEG-1 Layer

The MPEG-1 Layer 3 algorithm development started in 1987 with a joint cooperation of Fraunhofer-

Gesellschaft IIS-A and the University of Erlangen. It was standardized by the ISO as MPEG Audio Layer 3

and soon became the de-facto standard for audio encoding due to the high compression rates (1/12 of the

original size, still retaining considerable quality), the high availability of decoders and the low CPU requirements

for playback (a 486 DX2-66 is enough for real-time decoding). It supports sampling frequencies from 32

kHz to 48 kHz.

Use this setting together with the audio bit rate value of 96 - 320 kbps if you plan to playback the output

video file on a DVD player with DivX/Xvid support, portable DVD player with DivX/Xvid support,

personal computer, BlackBerry 81xx Series (Pearl), Creative Zen Vision player, Archos DVR or

portable media player.

WMA

Windows Media Audio, an audio data compression technology developed by Microsoft. The name can be

used to refer to its audio file format or its audio codecs. It is a proprietary technology which forms part of the

Windows Media framework. WMA consists of four distinct codecs. The original WMA codec, known simply as

WMA, was conceived as a competitor to the popular MP3 and RealAudio codecs. It is the second most popular

audio codec after MP3, based on the number of supported devices researched by Jupiter Research. WMA Pro, a

newer and more advanced codec, supports multichannel and high resolution audio. A lossless codec, WMA

Lossless, compresses audio data without loss of audio fidelity. And WMA Voice, targeted at voice content,

applies compression using a range of low bit rates.

Use this setting together with the audio bit rate value of 96 - 320 kbps if you plan to playback the output

video file on a Microsoft Zune, Pocket PC and Smartphones that work under Windows Mobile OS.

Format setting can be chosen from the preset list only and cannot be altered.

Bit rate - the number of data points used to approximate the true wave form. The higher the bit rate the better the quality of the

resulting audio but the output file size also gets larger at higher bit rate values. Different types of devices require different bit rate

values and might not playback the output file if the bit rate is not appropriate. The value can be chosen from the given presets.

Bit rate Details

96 - 320 kbps

Use this setting together with the MPEG-1 Layer 3 audio format if you plan to playback the output video

file on a DVD player with DivX/Xvid support, portable DVD player with DivX/Xvid support,

personal computer, Creative Zen Vision player, Archos DVR, Epson P-2000/P-4000 Multimedia

Storage Viewers or portable media player.

64 - 256 kbps

Use this setting together with the MPEG-4 AAC (LC) audio format if you plan to playback the output video

file on Sony PSP handheld device or Apple iPod.

4.75 - 12.2

kbps

Use this setting together with the AMR ACELP Narrowband audio format if you plan to playback the

output video file on a mobile GSM or CDMA phone.

Bit rate setting can be chosen from the preset list only and cannot be altered.

Frequency - sampling frequency specified in hertz. The highest possible pitch in the sound is equal to one-half that of the set

sampling frequency.

Frequency Details

48000 Hz

Use this setting if the input video file sampling frequency is 48000 hertz and if you plan to playback the output

video file on a device that supports the sound with such sampling frequency. The highest possible pitch in the

sound of the file will be 24000 hertz, above the top of human hearing range. The movie can be played on a

DVD player with DivX/Xvid support, portable DVD player with DivX/Xvid support, Apple TV, Sony

PlayStation 3, Microsoft Xbox 360, personal computer, Sony PSP handheld device (together with

H.264 output video format), Creative Zen Vision player, Archos DVR or portable media player.

AVS4YOU Programs Help - AVS Video to GO

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