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.

[Dynamic]

You've defined your problem a bit better.

You might want to look into SoX audio toolkit. It can be run from the commandline or a batch script, making it possible to deal with a whole bunch of files. It's also open source, like Audacity, which you used to plot that waveform.

It has switches to detect silences, which you could modify to make it detect or split that file:
http://sox.sourceforge.net/sox.html
... scroll down to the silence section.

You could either modify the source code to do what you want, or run Sox to decode an appropriate file and see if it produces more than one silence

Your use case is not normal, as few people who care about quality will have such bad files because they'll have chosen secure or database-verified ripping or listened to the output with their ears.

I'm sure you'll need to do some coding yourself.