Have encoder in seperate thread

[LetsMelon]

The program could have a big speed up if the encoder and renderer are in two seperate threads.

The encoder gets frames and encodes them into a video.
The renderer generates each frame and sends it to the encoder.

If the encoder and the renderer need the same time, then running them in parallel could half the total time to generate a video with rusvid.

Simple diagram:

sequenceDiagram
    Render->>+Encoder: frame 0
    Render->>+Encoder: frame 1
    Render->>+Encoder: frame 2
    Render->>+Encoder: frame 3
    Render->>+Encoder: frame ...

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