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Topic: Best Audiochecker program? (Read 6860 times) previous topic - next topic
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Re: Best Audiochecker program?

Reply #25
Are there really any known algorithmic giveaways available to give a good conclusion, except comparing to the encoders' known lowpasses?

(One should also be careful about selected counterexamples, as you cannot really surely tell that it isn't part of what the artist deliberately sent off. But we knew that, eh?)
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Re: Best Audiochecker program?

Reply #26
M4A file, Bitrate 61 kbps. Cut-off at 20.5 kHz.

Code: [Select]
Writing application : fhgaac v03.02.16;VBR=2
How are you setting up the cutoff frequency ? With Winamp ? Because I can't find such an option in any fhgaacenc version.

Re: Best Audiochecker program?

Reply #27
How are you setting up the cutoff frequency ? With Winamp ? Because I can't find such an option in any fhgaacenc version.
I used the foobar front end with auto settings. When the preset quality is low enough it will switch to SBR mode and render beautiful spectrograms, provided the source audio files have enough high frequency content.

Re: Best Audiochecker program?

Reply #28
(One should also be careful about selected counterexamples, as you cannot really surely tell that it isn't part of what the artist deliberately sent off. But we knew that, eh?)
Yeah, for example some "noise reduction" plugins in DAWs, when used with sources like noisy analog tapes. Depends on user settings and how the plugins are designed, it is possible to create gradual lowpass with spectral discontinuity, not only they can fool checking software, the resulting files can even look similar to some lossy codecs in spectrograms.

Some vintage synthesizers like the Roland SC/JV series used 32kHz synth engines and they will also result in obvious lowpass in spectrograms.

Re: Best Audiochecker program?

Reply #29
I used the foobar front end with auto settings. When the preset quality is low enough it will switch to SBR mode and render beautiful spectrograms, provided the source audio files have enough high frequency content.
Thanks for the information, I'll do some testing :)

Re: Best Audiochecker program?

Reply #30
Since I'm using foobar portable, do you know by any chance where I should copy the fhgaacenc folder ? Or should I just drop all of the needed files in the Encoders folder ?
I am using portable version too. Just copy the highlighted files to the encoder folder.
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Re: Best Audiochecker program?

Reply #31
Yep, I've figured it out, the reason why I've removed this question from my post.
Thanks for the answer, it might help someone else one day ;)


 

Re: Best Audiochecker program?

Reply #33
(One should also be careful about selected counterexamples, as you cannot really surely tell that it isn't part of what the artist deliberately sent off. But we knew that, eh?)
Yeah, for example some "noise reduction" plugins in DAWs, when used with sources like noisy analog tapes. Depends on user settings and how the plugins are designed, it is possible to create gradual lowpass with spectral discontinuity, not only they can fool checking software, the resulting files can even look similar to some lossy codecs in spectrograms.

Some vintage synthesizers like the Roland SC/JV series used 32kHz synth engines and they will also result in obvious lowpass in spectrograms.
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