avio_skip(pb, 1); // skip reserved flags
size = avio_rl16(pb); // size of the Format Data
tag = ff_get_bmp_header(pb, st, NULL);
avio_skip(pb, 1); // skip reserved flags
size = avio_rl16(pb); // size of the Format Data
tag = ff_get_bmp_header(pb, st, NULL);