Question

Yes this is an exact duplicate of this question, but the link given and accepted as answer is not working for me. It is returning incorrect values (a 2 minutes mp3 will be listed as 1’30, 3 minutes as 2’20) with no obvious pattern.

So here it is again: how can I get the length of a MP3 using C# ?

or

What am I doing wrong with the MP3Header class:

MP3Header mp3hdr = new MP3Header();
bool boolIsMP3 = mp3hdr.ReadMP3Information("1.mp3");
if(boolIsMP3)
  Response.Write(mp3hdr.intLength);

Answer 1

Apparently this class computes the duration using fileSize / bitRate. This can only work for constant bitrate, and I assume your MP3 has variable bitRate…

EDIT : have a look at TagLib Sharp, it can give you the duration