Datasheet

Output Audio Parameters

[Format] [Bit rate] [Frequency] [Channels]

Format - format of the audio component used in the output video file.

Format Details

MPEG-4 AAC

(LC)

MPEG-4 Advanced Audio Coding (Low Complexity) audio codec used for coding audio signal with low and

normal bit rates (64 - 256 kbps) and is the most used object type in AAC encoders and decoders nowadays

because of its low system requirements, i.e. CPU and memory resources. So available hardware decoders in

portable devices usually only play MPEG-4 AAC (LC) files and nothing else. As long as the bit rates do not

usually drop below 80-96 kbps/stereo for music content it is efficient enough to maintain good sound quality at

these settings. When used for purely speech coding, AAC (LC) can be used with much lower bit rates (down to

8-12 kbps/mono), because there's only one channel, and the sample rate in the input file or bit stream usually

is 8 kHz (cutoff at 4 kHz or lower).

Use this setting together with the audio bit rate value of 64 - 256 kbps if you plan to playback the output

video file on Sony PSP handheld device, Apple TV, Sony PlayStation 3, Microsoft Xbox 360, Epson

P-2000/P-4000 Multimedia Storage Viewers or Apple iPod.

AMR ACELP

Narrowband

Adaptive Multi-Rate Code-Excited Linear Prediction speech codec is part of the 3GPP standard for mobile

phones and is used for coding audio signal with very low bit rates (4.75 - 12.2 kbps). It is very useful when

compressing media files for watching them on the mobile GSM or CDMA phones and for transferring them

over the mobile networks because it allows to minimize the output file size and still have acceptable results.

Use this setting together with the audio bit rate value of 4.75 - 12.2 kbps if you plan to playback the output

video file on a mobile GSM or CDMA phone.

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