XMedia Recode

FDK AAC - Codec settings: Tips and Techniques


Specifies whether the audio track is encoded or copied.



Specifies which audio codec is used for encoding.


Sets the language that the player displays when playing.


Sets the stream delay.

Sample rate

Specifies the sample rate.

The higher the sample rate, the richer the sound. The values are between 8000 and 96000 Hz.


  • Mono
  • Stereo
  • 5.0
  • 5.1

Rate control mode

  • ABR
  • Qualität ( 1 bis 5)


Sets the bitrate. A higher bit rate improves the sound quality but also increases the size of the file. Values are between 32 and 1152 kbps.


  • MPEG-4 AAC LC (Low Complexity)
  • MPEG-4 AAC HE (High Efficiency)
  • MPEG-4 AAC HE V2 (High Efficiency)
  • MPEG-4 AAC Low Delay (LD)
  • MPEG-4 AAC Enhanced Low-Delay


Sets the low pass filter with the specified cutoff frequency in Hertz.
If "0" is entered, a low-pass filter is automatically set.



This parameter controls the use of the afterburner feature. The afterburner is a type of analysis by synthesis algorithm which increases the audio quality but also the required processing power. It is recommended to always activate this if additional memory consumption and processing power consumption is not a problem. If increased MHz and memory consumption are an issue then the MHz and memory cost of this optional module need to be evaluated against the improvement in audio quality on a case by case basis.

SBR (Spectral band replication) for ELB

Spectral band replication (SBR) is a technology to enhance audio or speech codecs, especially at low bit rates and is based on harmonic redundancy in the frequency domain.