Q: Why Itunes does not read the end of m4p files (last 30 seconds are skipped) ?

Hey ThierryWillame,

Thanks for the question. Were these songs purchased from the iTunes Store? If so, see the following resource. If not, follow the same steps for the content, based on how you acquired it (delete and re-add).

Songs in iTunes may not play back completely

http://support.apple.com/kb/TS4357

Symptoms

 

Occasionally, if a song purchased from the iTunes Store on a Mac or PC was not downloaded completely, the song may not play back fully. The song may abruptly stop during playback, and iTunes may start playing the next song in your library or playlist.

 

Resolution

 

If iTunes in the Cloud is available in your country, try the following steps to resolve the issue:

 

1. Delete the purchased song that is exhibiting the problem from your iTunes library.

2. Click on the Purchased link in the iTunes Store to view your previously purchased music.

3. Download your previously purchased song from this list.

 

Note: iTunes in the Cloud, which allows you to download previously purchased songs from the iTunes Store, is not available in every country. Learn if iTunes in the Cloud is offered in your country.

Additional Information:

iTunes 11 for Mac: Delete songs, playlists, or other items

http://support.apple.com/kb/PH12159

Download past purchases

http://support.apple.com/kb/HT2519

Thanks,

Matt M.