How did you increase the cutoff to above 20K in FDK AAC?

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fredd1230
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How did you increase the cutoff to above 20K in FDK AAC?

Post by fredd1230 » Thu May 30, 2024 1:38 am

FDK AAC only allows you to set the cutoff to 20khz when used with the CMD wrapper or FFmpeg. How did you manage to increase it to above 20khz in some of your presets, with some of them having no cutoff?
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poiko
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Re: How did you increase the cutoff to above 20K in FDK AAC?

Post by poiko » Thu May 30, 2024 7:43 am

FDK AAC used in EZ CD Audio Converter is a customized version. It contains xHE-AAC related decoder improvements and optimized AAC LC and HE AAC (v2) formats.
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Re: How did you increase the cutoff to above 20K in FDK AAC?

Post by fredd1230 » Thu May 30, 2024 7:03 pm

However on your page detailing the cutoff points for different bitrates you say that the FDK AAC source code is not modified, so how did you manage this?
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Re: How did you increase the cutoff to above 20K in FDK AAC?

Post by poiko » Thu May 30, 2024 9:22 pm

fredd1230 wrote: Thu May 30, 2024 7:03 pm However on your page detailing the cutoff points for different bitrates you say that the FDK AAC source code is not modified, so how did you manage this?
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Re: How did you increase the cutoff to above 20K in FDK AAC?

Post by fredd1230 » Thu May 30, 2024 10:01 pm

Thank you for your help.

So FDK AAC hasn't been modified, you're just interfacing with it in a way that offers more flexibility.
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Re: How did you increase the cutoff to above 20K in FDK AAC?

Post by poiko » Fri May 31, 2024 7:41 am

See

https://github.com/mstorsjo/fdk-aac/blo ... cenc_lib.h

AACENC_BANDWIDTH allows setting the bandwidth, -1 for full bandwidth fs/2
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