spectral analyzer. not sure if you need cli or batch function, but the frequency will be cut off regardless of the purported bitrate even if it was "upscaled" since those frequencies were chopped previously. you can see a sample screenshot in the upper left showing the frequency. re-encode a 320kbps to 128kbps and you can see the frequency range diminished on the 128kbps.
spectral analyzer. not sure if you need cli or batch function, but the frequency will be cut off regardless of the purported bitrate even if it was "upscaled" since those frequencies were chopped previously. you can see a sample screenshot in the upper left showing the frequency. re-encode a 320kbps to 128kbps and you can see the frequency range diminished on the 128kbps.