Method dropframe

include/xstudio/utility/timecode.hpp:36–36

    [[nodiscard]] unsigned int frames() const { return frames_; }
    [[nodiscard]] double framerate() const { return frame_rate_; }
    [[nodiscard]] bool dropframe() const { return drop_frame_; }
    [[nodiscard]] unsigned int total_frames() const;

    void hours(const unsigned int h) { hours_ = h; }