double frame_rate,
int use_copy,
Indexable *indexable);
+// create new cache vframe at position, return 0 if it already exists
+// if first_frame set, clear cache before new vframe created
+// if new vframe created, leave cache locked for frame load
+ VFrame *new_cache_frame(int64_t position, int w, int h,
+ int color_model, int layer, double frame_rate,
+ int first_frame);
+ void put_cache_frame();
void dump();