extern int64_t video_frames_to_audio_frames (ContentVideoFrame v, float audio_sample_rate, float frames_per_second);
extern std::pair<std::string, int> cpu_info ();
extern int64_t video_frames_to_audio_frames (ContentVideoFrame v, float audio_sample_rate, float frames_per_second);
extern std::pair<std::string, int> cpu_info ();