Hi, Thilo Borgmann a ?crit : > Revision 24 attached. > > + // read the fixed items > + als_id = get_bits_long(&gb, 32); > + avctx->sample_rate = m4ac.sample_rate; > + skip_bits_long(&gb, 32); // sample rate already known > + sconf->samples = get_bits_long(&gb, 32); > + avctx->channels = m4ac.channels; ^^^^^^^^^^^^ Shouln't be m4ac.chan_config ?