At 5/29/24 06:02 PM, ADR3-N wrote:At 5/29/24 05:21 PM, wolfatthedoor wrote:At 5/29/24 04:05 AM, Questtrek wrote:Anyone have any insight to pitch in?
they could be reencoding the ai tracks into something that isnt 192kbps
This is possible. But even if so the waveform will still LOOK like 192 kbps. You can download it and see. The quality if reencoded will ALSO be 192 kbps.
Unless they are also upscaling it. Which in a lot of cases will STILL sound like crap, and I don't even know of an upscaler. It is possible there are other AI "music" sites which have bitrates higher than 192 as well.
Okay, I analyzed 7eunnn’s music and put it through a spectrogram. You can look at the max kHz the song reaches to determine its original bitrate, even if someone just threw it in Audacity first and uploaded it as a 320kbps track.
An MP3 file with a bitrate of 192kbps should rarely exceed 19kHz. I’ve uploaded an example spectrogram of a Suno AI generation I downloaded a couple days ago. As you can see, there’s a very clear cutoff at 19kHz. However, I’ve noticed that many Suno AI songs will have a lower peak kHz than 19. I can upload more examples if necessary, but just as a rule of thumb, Suno AI songs shouldn’t exceed 19kHz as a peak frequency.
For comparison, I also ran Creo’s “Sky and Soul” (downloaded as a 320kbps MP3 from Newgrounds), and its cutoff is at 20kHz, nearly perfectly. This is the max kHz of an MP3 encoded at 320kbps, which matches the metadata of the file. (This is included in the google drive link below, I can only put two images in a post.)
Now let's take a look at the spectrogram of “Electric Shock” by 7eunnn. It’s suspicious to say the least. There’s a few random peaks (more like fuzz) jumping up to 20khz, but most of the track follows along the line of 19kHz, which is usually indicative of an MP3 encoded at 192kbps. I’m not sure what causes this “fuzz”, but it could be from upscaling or just an artifact of how it was encoded. Or it could just be how it was mixed. I don't know. Regardless, most of the song's max frequency sits squarely at 19kHz.
The other songs are a mixed bag. Some are more questionable than others. “Pulse” has an extremely low bitrate for some reason. “Random” has a line at 17kHz with fuzz up to 20kHz. “Incognito” has much of the song at 19kHz, but there’s notable sections at 20kHz. Like I said, a mixed bag. Here’s all the spectrogram results, also in a higher resolution:
https://drive.google.com/drive/folders/1yToxxK8w0rngyXZL0geLSSLw1bw7gNjL?usp=sharing
You suggested that this could be another AI Music generator and I think that this could be Udio AI (it's another common AI music creator). I’m not very familiar with Udio, but I know it exports at a higher bitrate. I also am not experienced enough to simply listen to the track by ear and “know” what bitrate it is. I only know how to recognize artifacts in AI, and dig through metadata and spectrographic evidence if necessary. And all the evidence I have (at least for electric shock) is either common with AI uploaders, or is suspicious. First of all, the album art on Electric Shock is misaligned and looks mildly AI-generated. Second, it hits all those notes that AI does; those high awkward, garbled notes. Third, the spectrogram is a little suspicious too, since most of the song maxes out at 19kHz, showing that it might have originally been 192kbps, the max output of Suno AI. Also, 7eunnn seems desperate to get scouted and whitelisted for Geometry Dash as seen by the tags, never a great sign. Obviously, I could be missing something critical (I’m not a musician, composer, or expert in spectrograms), so please use your best judgment.
@G2961 Any insight on if this is Udio? You’re more familiar with it than I am.
Thanks,
Quest
