Audio Formats

Transform supports the following audio Format identifiers:

Format

Description

aac

Advanced Audio Coding (AAC)

ac3

Dolby Digital (AC-3)

eac3

Dolby Digital Plus (EAC-3)

atmos

Dolby Atmos (DD+JOC)

mpga

MPEG Layer 1/2

pcm_16int_little

PCM 16bit Little Endian

pcm_20int_little

PCM 20bit Little Endian

pcm_24int_little

PCM 24bit Little Endian

Advanced Audio Coding

The AAC format supports the following encoder 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

enum

lc Low Complexity
hev1 High Efficiency V1
hev2 High Efficiency V2 (Parametric Stereo)

MpegVersion

integer

0 MPEG-2
1 MPEG-4

Dolby Digital

The AC-3 and EAC-3 formats supports the following encoder configuration properties:

Property

Type

Description

AudioCodingMode

enum

See the Channel Configuration table blow.

EnableLowFrequencyEffects

boolean

See the Channel Configuration table blow.

BitRate

integer

32000 40000 48000 56000 64000 80000 96000 112000 128000 160000 192000 224000
256000 32000 384000
448000 512000 576000 640000

DialogNormalization

integer

Value in the range 1 to 31 representing a dialog normalization level between -1 and -31 dBFS.

See Audio Encoders for additional properties.

Channel Configuration

The following channel configurations are supported:

Channel Configuration

AudioCodingMode

EnableLowFrequencyEffects

1+1

0

false

1/0 C

1

false

2/0 L R

2

false

3/0 L C R

3

false

3/0 L C R LFE

3

true

2/1 L R Cs

4

false

2/1 L R Cs LFE

4

true

3/1 L C R Cs

5

false

3/1 L C R Cs LFE

5

true

2/2 L R Ls Rs

6

false

2/2 L R Ls Rs LFE

6

true

3/2 L C R Ls Rs

7

false

3/2 L C R Ls Rs LFE

7

true

3/4 L C R Ls Rs Lrs Rrs

21

false

3/4 L C R Ls Rs Lrs Rrs LFE

21

true

MPEG Audio

The MPEG audio format supports the following encoder 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


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