Say I have my camera in public filming an altercation between a cop and a citizen?

Altercation between a cop and a citizen. Altercation meaning anything from an arrest, search, anything..
If the cop were to request I stop filming him, do I HAVE to stop or can I continue filming and can he make an arrest on me if I don't stop? And is he able to take my camera?

Hasn't happened to me or anything I just wanna know. Thanks!
 
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