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Enhanced AAC+, how to compare quality between original file and decode
happysaisai
post Sep 19 2012, 16:33
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Hello,I'm doing with Enhanced aac+ codec, i met a problem ,is there someone knows which tool can be used to calculate the quality between original .wav file and the decoder output .wav file ?
I tried PEAQ, but the ODG value seems very low even though i did not add any error to the stream file.3gp.
Because the decoder output file is delayed, and the length between two files is different, so i shift the decoder output file and made the two files have same length, but still doesn't work, does someone know how to modify PEAQ or the two files?
Thanks.
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C.R.Helmrich
post Sep 19 2012, 23:08
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Regarding PEAQ:

  • Make sure both input (reference) and decoded (test) file are sampled at 48 kHz, since IIRC that's required by the PEAQ algorithm. Resample if necessary. You can encode from and to 44.1 kHz, though.
  • PEAQ mainly compares waveforms, so it doesn't give you any meaningful information on HE-AAC with its parametric stereo and bandwidth Extension (the ODGs are too low). See greynol's links.


Chris


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