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What do you mean by original media?
any recorded media will be in some of these type of formats...
Point is the material should be unaltered one, having cuts, here and there, will make such evidence not acceptable.
For instance, husband and wife are talking, slowly either of the spouse become abusive verbally or abusive physically. The entire shot should be in one go. It should not project one has hero and other as a villain just giving only aspects required to obtaining results.