Depending on the output format the other settings differ. First we
will discuss MP3 settings
Bit rate. The higher the bit rate, the higher the
quality of the MP3 and the file size is bigger. We recommend the
rate of 256 kbps. At this rate the quality is similar to a studio
record and the compression is about ten times.
Maximal bit rate - used when a variable bit rate
conversion is selected. The upper setting acts as the minimal bit
rate. For maximal bit rate we recommend you 320 kbps.
Channel mode. Here you can choose from Mono, Stereo,
Joint Stereo, MsStereo and Dual channel. If you choose Joint
Stereo the encoder will use the correlation between two channels
to reduce the size of the output file. Dual channel files are made
of two independent mono channel. Each one uses exactly half of the
file bit rate. For example if two different languages are carried
in the same bitstream, an appropriate decoder will decode only the
chosen language. We recommend the use of the Stereo channel mode
Emphasis. Re-equalizes the sound after a Dolby-like
noise suppression. This is not used very often and will probably
never be. The following noise suppression models are used: none,
50/15ms, and CCITT j.17. We recommend you to choose 'none'.
Variable bit rate (VBR) quality. This parameter is used
when a variable bit rate is selected. The higher the VBR, the
higher the quality of the output MP3 and the files size is bigger.
We recommend you to use an average value of 5(min is 0 and max is
Use of variable bit rate (VBR). This setting lets the
encoder code every frame (piece) of the MP3 file by a different
bit rate. It estimates the bit rate in such a way that the given
quality (the previous parameter) is achieved for every single
frame of the Mp3 file using a minimal bit rate. Thus the file size
gets smaller in comparison to the constant bit rate encoding. So
we recommend you to use a VBR.
Use of low pass filter. This filter attenuates the high
frequencies in the output. So we recommend you to use it only when
you have selected 128 kbps or lower bit rate output(which means a
low quality output).
Use psycho-acoustics analysis. This setting lets the
encoder to dynamically choose which frequencies to suppress or
amplify in order to produce a more pleasant sound for the human
ear according to the scientific researches of the human perception
of sound. We recommend you to use this feature.