Refactoring, FFmpeg updates

src/imgui/window/animation_preview.h

@@ -10,6 +10,10 @@ namespace anm2ed::imgui
   class AnimationPreview : public Canvas
   {
     bool isPreviewHovered{};
+    bool isSizeTrySet{true};
+    Settings savedSettings{};
+    float savedZoom{};
+    glm::vec2 savedPan{};
     glm::ivec2 mousePos{};
     std::vector<resource::Texture> renderFrames{};