Audio Encoders

Format	Compressor
`mcac`	Advanced Audio Coding
`alac`	Apple Lossless Audio Codec
`ec3`	Dolby Digital
`dlbe`	Dolby E
`dtsh`	DTS HD
`dtsx`	DTS X
`flac`	Free Lossless Audio Codec (FLAC)
`lame`	LAME MP3
`mc2a`	MPEG Layer 1/2
`opus`	Opus
`vorb`	Vorbis
`wma`	Windows Media Audio

Advanced Audio Coding

The mcac encoder supports the following configuration properties:

Property	Type	Description
`BitRate`	integer	`6000`, `7000`, `8000`, `10000`, `12000`, `14000`, `16000`, `20000`, `24000`, `28000`, `32000`, `40000`, `48000`, `56000`, `64000`, `80000`, `96000`, `112000`, `128000`, `160000`, `192000`, `224000`, `256000`, `320000`, `384000`, `448000`, `512000`, `640000`, `768000`, `896000`, `1024000`
`Profile`	integer	`2` Low Complexity `5` High Efficiency V1 `29` High Efficiency V2 (Parametric Stereo)
`MpegVersion`	integer	`0` MPEG-2 `1` MPEG-4

Channel Configuration

The channel configuration is determined by the number of audio channels as folllows:

Channels	Channel Configuration
`1`	C
`2`	L R
`3`	C L R
`4`	C L R Cs
`5`	C L R Ls Rs
`6`	C L R Ls Rs LFE
`7`	C L R Ls Rs Cs LFE
`8`	C L R Lsd Rsd Ls Rs LFE

Allowable Bitrates

The High Efficiency V1 profile allows the following BitRate values:

Channels	SampleRate	HEv1 BitRate
`1`	`16000` - `24000` `32000` `44100` - `48000`	`10000` - `40000` `16000` - `56000` `16000` - `64000`
`2`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`16000` - `56000` `16000` - `64000` `24000` - `80000` `32000` - `96000`
`3`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`28000` - `80000` `28000` - `96000` `48000` - `128000` `56000` - `128000`
`4`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`40000` - `112000` `40000` - `128000` `64000` - `160000` `80000` - `192000`
`5`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`48000` - `128000` `48000` - `160000` `80000` - `192000` `96000` - `224000`
`6`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`48000` - `128000` `48000` - `160000` `80000` - `192000` `96000` - `224000`

The High Efficiency V2 profile allows the following BitRate values:

Channels	SampleRate	HEv2 BitRate
`2`	`16000` `22050` - `24000` `32000` `44100` - `48000`	`10000` - `40000` `10000` - `48000` `16000` - `56000` `16000` - `64000`

Dolby Digital

The Dolby Digital ec3 encoder supports the following configuration properties:

Property	Type	Description
OutputFormat	string	Four character code that specifies the output audio stream format: `ac-3` Dolby Digital `ec-3` Dolby Digital Plus
AnalogToDigitalConverterType	integer	`0` Standard `1` High Definition
`AudioCodingMode`	integer	`0` 1+1 `1` 1/0 C `2` 2/0 L R `3` 3/0 L C R `4` 2/1 L R Cs `5` 3/1 L C R Cs `6` 2/2 L R Ls Rs `7` 3/2 L C R Ls Rs `21` 3/4 L C R Ls Rs Lrs Rrs
`BitRate`	integer	`32000` `40000` `48000` `56000` `64000` `80000` `96000` `112000` `128000` `160000` `192000` `224000` `256000` `320000` `384000` `448000` `512000` `576000` `640000`
`BitstreamMode`	integer	`0` Complete Main `1` Music and Effects `2` Visually Impaired `3` Hearing Impaired `4` Dialogue `5` Commentary `6` Emergency `7` Voice Over
`CopyrightProtected`	boolean
`DialogNormalization`	integer	Value in the range `1` to `31` representing a dialog normalization level between -1 and -31 dBFS.
`DolbySurroundMode`	integer	`0` not indicated `1` disabled `2` enabled
`DrcLineModeProfile`	integer	`0` none `1` film standard compression `2` film light compression `3` music standard compression `4` music light compression `5` speech compression
`DrcRfModeProfile`	integer	`0` none `1` film standard compression `2` film light compression `3` music standard compression `4` music light compression `5` speech compression
`EnableLfeLowPassFilter`	boolean	Enables or disables the LFE low pass filter.
`EnableLowFrequencyEffects`	boolean	Enables the LFE channel.
`LoRoCenterMixLevel`	integer	Specifies the center channel level for a conventional (LoRo) stereo down mix: `0` 1.414 (+3.0 dB) `1` 1.189 (+1.5 dB) `2` 1.000 (0.0 dB) `3` 0.841 (-1.5 dB) `4` 0.707 (-3.0 dB) `5` 0.595 (-4.5 dB) `6` 0.500 (-6.0 dB) `7` 0.000 (-inf dB)
`LoRoSurroundMixLevel`	integer	Specifies the surround channel level for a conventional (LoRo) stereo down mix.
`LtRtCenterMixLevel`	integer	Specifies the center channel level for a matrix (LtRt) stereo down mix.
`LtRtSurroundMixLevel`	integer	Specifies the surround channel level for a matrix (LtRt) stereo down mix.
`MixingLevel`	integer	Audio production mixing level (80 - 111).
`NinetyDegreePhaseShift`	boolean
`OriginalBitstream`	boolean
`RoomType`	integer	`0` not indicated `1` large room `2` small room
`SuroundExMode`	integer	`0` not indicated `1` disabled `2` enabled
`ThreeDecibelAttenuation`	boolean

Channel Configuration

If not specified the channel configuration is determined by the number of audio channels as follows:

Channels	AudioCodingMode	EnableLowFrequencyEffects
`1`	`1` 1/0 C	`false`
`2`	`2` 2/0 L R	`false`
`3`	`3` 3/0 L C R	`false`
`4`	`6` 2/2 L R Ls Rs	`false`
`5`	`7` 3/2 L C R Ls Rs	`false`
`6`	`7` 3/2 L C R Ls Rs	`true`
`7`	`21` 3/4 L C R Ls Rs Lrs Rrs	`false`
`8`	`21` 3/4 L C R Ls Rs Lrs Rrs	`true`

Allowable Bitrates

The following BitRate values are supported:

AudioCodingMode	Minimum BitRate	Default BitRate
`0` 1+1	`96000`	`192000`
`1` 1/0 C	`56000`	`96000`
`2` 2/0 L R	`96000`	`192000`
`3` 3/0 L C R	`160000`	`256000`
`4` 2/1 L R Cs	`160000`	`256000`
`5` 3/1 L C R Cs	`192000`	`320000`
`6` 2/2 L R Ls Rs	`192000`	`320000`
`7` 3/2 L C R Ls Rs	`224000`	`384000`
`21` 3/4 L C R Ls Rs Lrs Rrs	`256000`	`448000`

Dolby E

The dlbe encoder supports the following configuration properties:

Property	Type	Description
`OutputFormat`	string	`sowt` 16 Bit Little Endian `42ni` 24 Bit Little Endian `23ni` 32 Bit Little Endian
`FrameRate`	integer	Specifies the video frame rate: `0` Not specified `1` 23.976 `2` 24 `3` 25 `4` 29.97 `5` 30 `6` 50 `7` 59.94 `8` 60
`ProgramConfiguration`	integer	Specifies the program configuration.
`BitDepth`	integer	Specifies the output bit depth, either 16 or 20 bits. Note that for 16 precision the program configuration is limited to a total of 6 channels.
`KeyPresent`	boolean	Indicates whether bitstream keys are present.
`Timecode`	string	Starting time code.
`EncoderDelay`	integer
`Program`	array	Dolby digital metadata for each program. See program metadata.

Program Configurations

Value	Programs	Channels
0	5.1 + 2	`L1 C1 Ls1 L2 R1 LFE1 Rs1 R2`
1	5.1 + 1 + 1	`L1 C1 Ls1 C2 R1 LFE1 Rs1 C3`
2	4 + 4	`L1 C1 L2 C2 R1 Cs1 R2 Cs2`
3	4 + 2 + 2	`L1 C1 L2 L3 R1 Cs1 R2 R2`
4	4 + 2 + 1 + 1	`L1 C1 L2 C3 R1 Cs1 R2 C4`
5	4 + 1 + 1 + 1 + 1	`L1 C1 C2 C4 R1 Cs1 C3 C5`
6	2 + 2 + 2 + 2	`L1 L2 L3 L4 R1 R2 R3 R4`
7	2 + 2 + 2 + 1 + 1	`L1 L2 L3 C4 R1 R2 R3 C5`
8	2 + 2 + 1 + 1 + 1 + 1	`L1 L2 C3 C5 R1 R2 C4 C6`
9	2 + 1 + 1 + 1 + 1 + 1 + 1	`L1 C2 C4 C6 R1 C3 C5 C7`
10	1 + 1 + 1 + 1 + 1 + 1 + 1 + 1	`C1 C3 C5 C7 C2 C4 C6 C8`
11	5.1	`L1 C1 Ls1 R1 LFE1 Rs1`
12	4 + 2	`L1 C1 L2 R1 Cs1 R2`
13	4 + 1 + 1	`L1 C1 C2 R1 Cs1 C3`
14	2 + 2 + 2	`L1 L2 L3 R1 R2 R3`
15	2 + 2 + 1 + 1	`L1 L2 C3 R1 R2 C3`
16	2 + 1 + 1 + 1 + 1	`L1 C2 C4 R1 C3 C5`
17	1 + 1 + 1 + 1 + 1 + 1	`C1 C3 C5 C2 C4 C6`
18	4	`L1 C1 R1 Cs1`
19	2 + 2	`L1 L2 R1 R2`
20	2 + 1 + 1	`L1 C2 R1 C3`
21	1 + 1 + 1 + 1	`C1 C3 C2 C4`
22	7.1	`L1 C1 Ls1 Lrs1 R1 LFE1 Rs1 Rrs1`
23	7.1 Screen	`L1 C1 Ls1 Lc1 R1 LFE1 Rs1 Rc1`

Program Metadata

The following Dolby Digital metadata properties can be provided for each program:

Property	Type	Description
`Description`	string	Program description, maximum 32 characters.
AnalogToDigitalConverterType	integer	`0` Standard `1` High Definition
`AudioCodingMode`	integer	`1` 1/0 C `2` 2/0 L R `3` 3/0 L C R `4` 2/1 L R Cs `5` 3/1 L C R Cs `6` 2/2 L R Ls Rs `7` 3/2 L C R Ls Rs
`BitstreamMode`	integer	`0` Complete Main `1` Music and Effects `2` Visually Impaired `3` Hearing Impaired `4` Dialogue `5` Commentary `6` Emergency `7` Voice Over
`CopyrightProtected`	boolean
`DialogNormalization`	integer	Value in the range `1` to `31` representing a dialog normalization level between -1 and -31 dBFS.
`DolbySurroundMode`	integer	`0` not indicated `1` disabled `2` enabled
`DrcLineModeProfile`	integer	`0` none `1` film standard compression `2` film light compression `3` music standard compression `4` music light compression `5` speech compression
`DrcRfModeProfile`	integer	`0` none `1` film standard compression `2` film light compression `3` music standard compression `4` music light compression `5` speech compression
`EnableHighPassFilter`	boolean	Enables or disables the DC high pass filter.
`EnableLfeLowPassFilter`	boolean	Enables or disables the LFE low pass filter.
`EnableLowFrequencyEffects`	boolean	Enables or disables the LFE channel.
`EnableLowPassFilter`	boolean	Enables or disables the bandwidth limiting low pass filter.
`LoRoCenterMixLevel`	integer	Specifies the center channel level for a conventional (LoRo) stereo down mix: `0` 1.414 (+3.0 dB) `1` 1.189 (+1.5 dB) `2` 1.000 (0.0 dB) `3` 0.841 (-1.5 dB) `4` 0.707 (-3.0 dB) `5` 0.595 (-4.5 dB) `6` 0.500 (-6.0 dB) `7` 0.000 (-inf dB)
`LoRoSurroundMixLevel`	integer	Specifies the surround channel level for a conventional (LoRo) stereo down mix.
`LtRtCenterMixLevel`	integer	Specifies the center channel level for a matrix (LtRt) stereo down mix.
`LtRtSurroundMixLevel`	integer	Specifies the surround channel level for a matrix (LtRt) stereo down mix.
`MixingLevel`	integer	Audio production mixing level (80 - 111).
`NinetyDegreePhaseShift`	boolean	Enables or disables the surround channel 90 degree phase shift filter.
`OriginalBitstream`	boolean
`PreferredDownmixMode`	integer	`0` not indicated `1` Lt/Rt downmix `2` Lo/Ro downmix
`RoomType`	integer	Audio production room type: `0` not indicated `1` large room `2` small room
`SuroundExMode`	integer	`0` not indicated `1` disabled `2` enabled
`ThreeDecibelAttenuation`	boolean	Enables or disables the surround channel 3dB attenuator.

MPEG Layer 1/2

The mc2a encoder supports the following configuration properties:

Property	Type	Description
`BitRate`	integer	`32000` `48000` `56000` `64000` `80000` `96000` `112000` `128000` `160000` `192000` `224000` `256000` `288000` `320000` `352000` `384000` `416000` `448000`
`Layer`	integer	`3` Layer 1 `2` Layer 2
`Version`	integer	`1` MPEG-1 `0` MPEG-2

Allowable Bitrates

The following BitRate values are supported:

Channels	Layer 1 BitRate	Layer 2 BitRate
1	`32000` `96000`	`32000` `48000` `56000` `80000`
2		`224000` `256000` `320000` `384000`
Any	`64000` `128000` `160000` `192000` `224000` `256000` `288000` `320000` `352000` `384000` `416000` `448000`	`64000` `96000` `112000` `128000` `160000` `192000`