Add constant framerate option for more smooth bitrate and pacing, solving issue 1877(which at least is problematic for NVENC encoder)

[Originalimoc]

Is there an existing issue for this?

• I have searched the existing issues

Is your issue described in the documentation?

• I have read the documentation

Is your issue present in the nightly release?

• This issue is present in the nightly release

Describe the Bug

If window duplicate producing less frame than asked framerate, send last available frame to the encoder, capped by moonlight request FPS or host current monitor Hz.

Expected Behavior

No response

Additional Context

No response

Host Operating System

Windows

Operating System Version

11

Architecture

64 bit

Sunshine commit or version

529f1b8

Package

Windows - installer

GPU Type

Nvidia

GPU Model

3xxx Desktop + AMD CPU

GPU Driver/Mesa Version

551.61 Studio

Capture Method (Linux Only)

No response

Config

Default install

Apps

No response

Relevant log output

Not Relevant. No error log.

[cgutman]

This should be supported after #2149 is merged.

[Originalimoc]

Huh interesting coincidence. But wait why can I capture Game Bar and Lock screen even now?