AC, AD (cinematografia)


Senior Member
Bilingual - Spanish (Mexico), English (USA)
Hello, I was translating a document and ran across the following terms, "AC" and "AD". This is taken in a cinematographic context, but I have not been able to find a translation for the terms "AC" and "AD". Does anyone know what they mean?
Here is the phrase:

Allá se conseguiría un productor en línea, un sonidista, un gaffer, un AC, y un AD.

Thank you
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