ID3v2 tags are often added at the start of mp3 files to give information about the song's title and artist. Unfortunately, some decoders cannot handle this new feature, and refuse to decode tagged mp3s. The results of this test are here . Occasionally mp3 files can become damaged. In this test we deliberately altered some of the data within an mp3, and attempted to decode it.
Some decoders refuse to play corrupt files, though others can recover the audio signal intact.
The results of this test are here . In such files, the bitrate can be any integer value between 8 and 640kbps. Very few decoders can handle such files. The results of this test are here . Summary Overall results The results of all these tests are summarised in one table.