The sound of "d" in "du" is not really clear. Maybe this can be improved a bit?
Is it my imagination, or does the "J'ai" in this sentence soud exactly like "Je"?
J'ai du sel et du poivre, c'est dans le cupboard
why isn't 'I have the salt and pepper correct?
Because it isnt "the" salt and pepper, it's an unspecified amount of salt and pepper, or "some".
j' ai sounds exactly like je and it took me awhile to realise in it was "j' ai" and i onky figured it out because of the sentance context, this should really be fixed