Can't FFWD or REV on MP3's created by avconv in my iPhone

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http://askubuntu.com – I'm using aconv to extract audio from some videos, but some weeks ago, the MP3 seems to be ok, but when loaded into my iPhone 4, I can't fast forward or rewind the current track. It only happens with recent aconv created MP3's. Any idea why? avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1 Here is the command I use avconv -i video.mp4 -ab 192k audio.mp3 Thanks a lot! (HowTos)