String containing custom OPUS options to send to the OpusEnc encoder.
For advanced users, this string allows applying all of the possible OPUS encoding options available with OpusEnc. See Appendix E - OpusEnc command line for the complete set of available options.
This property is used only if the EncodeFormats.FormatToUse property is set to ENCODING_FORMAT_OPUS and the EncodeFormats.OPUS.EncodeMode property is set to OPUS_ENCODE_CUSTOM.
IMPORTANT NOTE: As you may know, the OpusEnc command line is as follows:
Usage: opusenc [options] input_file output_file.opus
Contents of the CustomString property are related to the [options] field only so you must omit entering the word opusenc and omit to specify the input_file. You should also omit the --raw option and any other options related to the raw input format which are already applied internally .
For further details about encoding in OPUS format refer to the OPUS object section.
For further information about available encoding formats see the EncodeFormats object.