Extend FFmpeg support from 4.0 - 4.2 to 4.0 - 4.5/5.0#775
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…g 4.2 When FFmpeg Encoders was originally written, FFmpeg 4.2 was still new and OBS Studio did not seem to want to update to anything newer for a while. This led to code being fine-tuned for FFmpeg 4.2, which stops working the moment OBS Studio upgrades FFmpeg. This removes the dependency on FFmpeg 4.2 hopefully, and allows using newer FFmpeg versions - or perhaps even older versions. Additionally the nonsensical behavior of the Target Quality slider was fixed. It is now from 0 to 51, instead of from 0 to 100, and as such matches FFmpeg exactly.
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Explain the Pull Request
When FFmpeg Encoders was designed, it was designed for FFmpeg 4.2, which means that a lot of code only works with that specific version of FFmpeg. This has now come around to bite us in the back, as OBS Studio updated their FFmpeg version to something newer than 4.4, and as such the new SDK features are now enabled by default. This PR brings support for any FFmpeg version between 4.0 and 5.0, hopefully.
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