void still_duration_changed (wxCommandEvent &);
void audio_stream_changed (wxCommandEvent &);
void subtitle_stream_changed (wxCommandEvent &);
void use_audio_changed (wxCommandEvent &);
void still_duration_changed (wxCommandEvent &);
void audio_stream_changed (wxCommandEvent &);
void subtitle_stream_changed (wxCommandEvent &);
void use_audio_changed (wxCommandEvent &);