API changes, most recent first:
+2014-xx-xx - xxxxxxx - lavu 53.04.0 - opt.h
+ Add AV_OPT_FLAG_EXPORT and AV_OPT_FLAG_READONLY to mark options meant (only)
+ for reading.
+
+2014-xx-xx - xxxxxxx - lavu 53.03.01 - opt.h
+ Deprecate unused AV_OPT_FLAG_METADATA.
+
2014-02-xx - xxxxxxx - lavd 55.10.100 - avdevice.h
Add avdevice_list_devices() and avdevice_free_list_devices()