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The meaning of Profile field in AliyunAudioCodec of MPS

Last Updated: Apr 19, 2018

The audio coding and decoding configuration of MPS supports the following five profiles:

  • MPEG-4 AAC LC (default)

  • MPEG-4 HE-AAC (SBR)

  • MPEG-4 HE-AAC v2 (SBR+PS)

  • MPEG-4 AAC LD

  • MPEG-4 AAC ELD

Compatibility: LC-AAC > HE-AAC > HE-AAC v2

Compression rate: HE-AAC v2 > HE-AAC > LC-AAC

LD and ELD are mainly applicable to rapid coding scenarios such as radio broadcast.

2

SBR: Spectral Band Replication. SBR segments the frequency spectrum, and the low-frequency band is coded independently to save the main audio content, and the high-frequency band is amplified and coded independently to save the soundquality.

PS: Parametric Stereo. PS saves all the information of a sound track, and uses only a few bytes to describe its difference in parameters from another sound track.

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