Bitrate: When used with variable bitrate encoding (VBR), this specifies the minimum bitrate to be used. For more information, see -b switch in LAME Switch Reference.
Mode: This option defines the LAME -m switch.
Output directory: This is the directory where resulting files of the files that are encoded/decoded will end up. You may choose to put them in the same directory or a directory that you specify. Press the Browse Button to change the output directory.
Optimisation: There are three available options here:
None: No optimisation method will be implied
Speed: This option forces the encoder to use a faster encoding mode, but with a lower quality. This option implies the LAME -f switch
Quality: Use some quality improvements. Encoding will be slower, but the result will be of higher quality. This option implies the LAME -h switch
Include CRC-Checksums: This option will add a cyclic redundancy check (CRC) code in each frame. This option implies the LAME -p switch.
Copy: Mark the encoded file as being a copy. This option implies the LAME -o switch.
Copyright: Mark the encoded file as being copyrighted. This option implies the LAME -c switch.
Delete source file after processing: Check this box to delete the input file after it has been encoded/decoded. The input file will only be deleted if the output file is of a finite file size.
Enabled Variable Bitrate (VBR): This option implies the LAME -V switch unless the Use ABR instead of VBR CheckBox is checked in which case the --abr switch is implied.
Maximum VBR bitrate: Specifies the maximum allowed bitrate when using VBR. For more information, see -B switch in LAME Switch Reference.
Quality: Specifies the value of VBR quality. 0 = highest quality. This option defines the LAME -V switch.
Disable writing of the VBR tag: This tag is embedded in frame 0 of the MP3 file. It lets players correctly seek and compute playing times of VBR files. This option implies the LAME -t switch.
Strictly enforce minimum bitrate: This is mainly for use with hardware players that do not support low bitrate MP3. This option implies the LAME -F switch.
Use ABR instead of VBR: Turns on encoding with the specified targeted average bitrate (Target bitrate for ABR), allowing to use frames of different sizes. For more information, see -abr switch in LAME Switch Reference.
Allow block types to differ between channels: Allows the left and right channels to use different block size types. This option implies the LAME -d switch.
Disable all filtering: Tells the encoder to use full bandwidth and to disable all filters. This option implies the LAME -k switch.
Disable bit reservoir: Disable the bit reservoir. Each frame will then become independent from previous ones, but the quality will be lower. This option implies the LAME --nores switch.
Disable short blocks: Encode all frames using long blocks only. This option implies the LAME --noshort switch.
Comply as much as possible to ISO MPEG specification: With this option, the 7680 bit limitation on total frame size will be enforced to ensure strict ISO compatibility. This option implies the LAME --strictly-enforce-ISO switch.
ATH control: There are four available options here:
Default: This implies none of the ATH control LAME switches.
Only: This option causes the encoder to ignore the output of the psy-model and only use masking from the ATH. This option implies the LAME --athonly switch
Disabled: Disable any use of the ATH (absolute threshold of hearing) for masking. This option implies the LAME --noath switch
Only for short blocks: Ignore psychoacoustic model for short blocks, use ATH only. This option implies the LAME --athshort switch
Algorithm quality: Change choice of algorithms to determine the best scalefactors and huffman encoding:
0: slowest but best
2: recommended
9: poor quality
Custom options: Specify here any other switches you wish to use with LAME. Options available are in the LAME Switch Reference.
Only use custom options: Check this box to ignore all other settings in Encoder Decoder Options that imply LAME switches and just use the custom options specified.
Output sampling frequency: This option defines the LAME --resample switch. By default, the encoder will automatically resample the input when using high compression ratios.
High pass filtering frequency: Sets a high pass filtering frequency. Frequencies below the specified one will be cut off. This option defines the LAME --highpass switch.
Width of high pass filter: Set the width of the high pass filter. The default value is 15% of high pass frequency. This option defines the LAME --highpass-width switch.
Low pass filtering frequency: Sets a low pass filtering frequency. Frequencies above the specified one will be cut off. This option defines the LAME --lowpass switch.
Width of low pass filter: Set the width of the low pass filter. The default value is 15% of low pass frequency. This option defines the LAME --lowpass-width switch.