I tracked down a public copy of the problematic file I ran into. It is the MP3 available from <URL: http://www.dailytechnewsshow.com/dtns-2749-daily-tech-normie-show/ >. Running it without --xml produces this output:
% bs1770gain DTNormieS_01.mp3 analyzing ... [1/1] "DTNormieS_01.mp3": Error decoding audio: frame_reader_run() - "ffsox_frame_reader.c" (278). Error running engine: ffsox_engine_run() - "ffsox_engine.c" (37). Error running engine: ffsox_sox_reader_read() - "ffsox_sox_reader.c" (118). Error running SoX effects chain: ffsox_analyze() - "ffsox_analyze.c" (166). Error gathering track statistics. (bs1770gain_tree.c:163:bs1770gain_tree_analyze) % -- Happy hacking Petter Reinholdtsen
