Help. How to evaluate a Mp3's quality? Like noise existed in the f Options

[MaiTiano]

As mentioned in the title.

Now I am evolving into a project. In this project, we have a 128kbps mp3 library and we need to find which files have the inferior quality, such as noise existed, volume is too small etc.

Any advice? It would be better if someone know some open-source project which already has the ability to detect the mp3 files with bad quality.

many thanks.

[Nessuno]

Now I am evolving into a project. In this project, we have a 128kbps mp3 library and we need to find which files have the inferior quality, such as noise existed, volume is too small etc.

Do you intend lower quality with reference to the lossless source (which, as halb27 already pointed out, is very difficult without the reference), or absolute sound quality in this set, with reference to parameters like, for example, dynamic range, bandwidth, noise etc..., in which case the fact that they are mp3 has less importance?