How to prepare a RenderTexture to render a specific frame?

Question

Unity

How to prepare a rendertexture to display a specific frame? I use it in the videoplayer, set the frame number and the player does not always display the frame in the texture intermittently.
how to get rid of interruptions?
what should be the algorithm for working with videoplayer and texture so that I can do this?

Answer 1

called prepare first and did not set the time,
but waited for isprepared and called stepforward and the norms began to work