fix: change ffmpeg discovery when building for obs fork

[emilsas]

No description provided.

[coderabbitai]

Walkthrough

The pull request reorganizes FFmpeg dependency handling in CMakeLists.txt by inverting the plugin-build condition logic. FFmpeg and Moq wiring now triggers when BUILD_PLUGIN is enabled instead of when disabled. The configuration adds FFmpeg discovery via pkg-config and wires include directories, library directories, and libraries within the BUILD_PLUGIN branch, while maintaining fallback to FindPackage(FFmpeg) in the alternative path. A previously isolated FFmpeg dependency block is removed and consolidated into the updated conditional structure. Existing OBS library linkage and MOQ setup are preserved within the reorganized flow.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided by the author.	Add a description explaining the FFmpeg discovery changes, the reason for conditional handling based on BUILD_PLUGIN, and any testing performed.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: modifying FFmpeg discovery logic in the BUILD_PLUGIN conditional path for OBS fork builds.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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