I will be honest here. Your question is very confusing. As far as charges, the police have the discretion to charge or not charge and ultimately even if they charge someone the State has the last decision as to the filing of any charges. I am not sure why the police want to film you. That does sound quite odd and I would be concerned.
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The prosecution has many methods of gathering information in order to file possible charges. Why they specifically want to film a statement is a question only they can answer. However, they also are the only ones who can file criminal charges so your co operation is important.
You may want to have your own attorney inquire for you and be present at any meeting with the state.
The State can compel you to speak certain phrases, stand in a lineup, provide handwriting exemplars, and wear items of clothing (think of the OJ Simpson trial and the now-infamous glove). Generally, that must be accomplished via a subpoena if done post arrest.
You need to hire a criminal defense attorney ASAP.
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