void release_display_frame(DisplayFrame *frame);
double pts() { return double(pts_int) / TIMEBASE; }
void trim_queue(CaptureCard *card, size_t safe_queue_length);
void release_display_frame(DisplayFrame *frame);
double pts() { return double(pts_int) / TIMEBASE; }
void trim_queue(CaptureCard *card, size_t safe_queue_length);
bool get_display_frame(DisplayFrame *frame);
void add_frame_ready_callback(void *key, new_frame_ready_callback_t callback);
void remove_frame_ready_callback(void *key);
bool get_display_frame(DisplayFrame *frame);
void add_frame_ready_callback(void *key, new_frame_ready_callback_t callback);
void remove_frame_ready_callback(void *key);