Extended Bitstream Information


The extended bitstream options are part of the Alternate Bit Stream Syntax as specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts. If any one parameter in a group is specified, all values in that group will be written to the bitstream. Default values are used for those that are written but have not been specified. If the mixing levels are written, the decoder will use these values instead of the ones specified in the center_mixlev and surround_mixlev options if it supports the Alternate Bit Stream Syntax.

'-dmix_mode mode'

Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt (Dolby Surround) or Lo/Ro (normal stereo) as the preferred stereo downmix mode.

'0'
'notindicated'

Not Indicated (default)

'1'
'ltrt'

Lt/Rt Downmix Preferred

'2'
'loro'

Lo/Ro Downmix Preferred

'-ltrt_cmixlev level'

Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lt/Rt mode.

'1.414'

Apply +3dB gain

'1.189'

Apply +1.5dB gain

'1.000'

Apply 0dB gain

'0.841'

Apply -1.5dB gain

'0.707'

Apply -3.0dB gain

'0.595'

Apply -4.5dB gain (default)

'0.500'

Apply -6.0dB gain

'0.000'

Silence Center Channel

'-ltrt_surmixlev level'

Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lt/Rt mode.

'0.841'

Apply -1.5dB gain

'0.707'

Apply -3.0dB gain

'0.595'

Apply -4.5dB gain

'0.500'

Apply -6.0dB gain (default)

'0.000'

Silence Surround Channel(s)

'-loro_cmixlev level'

Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lo/Ro mode.

'1.414'

Apply +3dB gain

'1.189'

Apply +1.5dB gain

'1.000'

Apply 0dB gain

'0.841'

Apply -1.5dB gain

'0.707'

Apply -3.0dB gain

'0.595'

Apply -4.5dB gain (default)

'0.500'

Apply -6.0dB gain

'0.000'

Silence Center Channel

'-loro_surmixlev level'

Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lo/Ro mode.

'0.841'

Apply -1.5dB gain

'0.707'

Apply -3.0dB gain

'0.595'

Apply -4.5dB gain

'0.500'

Apply -6.0dB gain (default)

'0.000'

Silence Surround Channel(s)

'-dsurex_mode mode'

Dolby Surround EX Mode. Indicates whether the stream uses Dolby Surround EX (7.1 matrixed to 5.1). Using this option does NOT mean the encoder will actually apply Dolby Surround EX processing.

'0'
'notindicated'

Not Indicated (default)

'1'
'on'

Dolby Surround EX Off

'2'
'off'

Dolby Surround EX On

'-dheadphone_mode mode'

Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone encoding (multi-channel matrixed to 2.0 for use with headphones). Using this option does NOT mean the encoder will actually apply Dolby Headphone processing.

'0'
'notindicated'

Not Indicated (default)

'1'
'on'

Dolby Headphone Off

'2'
'off'

Dolby Headphone On

'-ad_conv_type type'

A/D Converter Type. Indicates whether the audio has passed through HDCD A/D conversion.

'0'
'standard'

Standard A/D Converter (default)

'1'
'hdcd'

HDCD A/D Converter