Each MP3 frame is made up of a header and data. specific multimedia format without reading the AVI or the MP3 bible is to play with ffmpeg. Oct 31, 2012 Invalid length being read from mp3 file #82. Closed. gonemad Since there was no valid Xing header found, we hope that we're in a constant. Sep 26, 2009 . Warning: 'audio.mp3': Skipping 32 bytes at the beginning (no valid MP3 header found). 'Cool.Movie.mkv' track 1: Using the MPEG.