void process_video (boost::shared_ptr<const Image> i, bool, boost::shared_ptr<Subtitle> s, double);
void process_audio (boost::shared_ptr<const AudioBuffers>, double);
void process_end ();
void process_video (boost::shared_ptr<const Image> i, bool, boost::shared_ptr<Subtitle> s, double);
void process_audio (boost::shared_ptr<const AudioBuffers>, double);
void process_end ();