Flashback saves a replay of the game, which can then be opened and captured with another camera. These are the individual stages: event recording → scene setup → video export. The saved replay is not yet an MP4, and moving the camera in the editor does not change the already played world.
Already available on the site ReplayMod introductory instructions. This guide is dedicated to Flashback's own process and does not imply that the formats of the two mods are interchangeable.
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Flashback
Moulberry
RURecord your Minecraft gameplay, play it back and create stunning cinematic shots