Understanding actual bit rate

[MadMat71]

I have this track that is a flac file 16bit, 44khz,  914kbs declared that FTF detects instead at 96kbs as actual bitrate.
If you see the spectrum it's actually above so I don't understand where 96kbs come from.
Thanks for clairification

[Fake No Funk]

From the spectrum view, I really doubt that it is a true flac. Around 15 kHz you can see that there are kind of "leaks" in the spectrum, it's easier to see when the "bitrate information overlay" is turned on.

Therefore, I'd also guess that it is upscaled from a mp3 file.
Those "glitches" that FTF uses to identify upscaled files are really small, but it's a strong indicator.

However, this is just what the spectrum says. Maybe this is intentionally

[MadMat71]

So the track is coming from this cd single.
https://www.discogs.com/release/4538431-Melissa-Etheridge-Im-The-Only-One
The files have been tested against AccurateRip and so we are sure they're coming from that source that shoud have the official master.
Probably it's the type of song that tricks the analysis. It's an acoustic song that starts with a guitar only that beats the tempo (so with some small silence between the beats)
Matteo

[Fake No Funk]

Then this was done within the mastering process...
Maybe they used some filters? I don't know...

The file is rather old - before loudness-war began.
FTF is trained for the "modern"  mixes, therefore it is very strict on such anomalies.

[MadMat71]

I have 2 more cases.
Same song / version. One is assigned with a 128kbs actual bit rate (the one with 16381 freq) and the other one 320kbs with a freq of 19786.
Ironically the first one appears to have an higher spectrum than the second and both are actually ripped from a good source with no compression.
See images

[Fake No Funk]

The spectrum shows "increased" frequencies at 11 kHz and 7.5 kHz, example 1 shows random noises above 16 kHz in addition, which is not normal for hires audio files and a strong indicator that the file was processed.. Even if the source is 100% original - modern files do not show these anomalies, that's why FTF marks them as "fake".