africans are victim of acculturation (you can call it a cultural genocide) since the time of the colonies and their own litteratura/films are mainly released/available in occidental countries so your statement is wrong.
to answer the question, the biggest african films collection i've seen so far is on Karagarga (MoM: African cinema - mars 2006). tehre are also 'african music' such as the prophet collection (traditionnal music from several countries/ethnies of west africa).
if you need some suggestions about interesting films/documentaries or even litteratura from Africa, don't hesitate to pm me.
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