Fix audio_codec index out-of-bounds access (coverity-709369).
Fix minor possible memory leak (coverity-1026794).
Fix memory leak in sdl_image producer (coverity-1026796).
Update the recommended FFmpeg/Libav versions.
Fix tiny memory leak in GlslManager (coverity-1026795).
Remove unused member (coverity-1026799).
Add missing lock in mlt_property:refresh_animation (coverity-1026788).
Fix possible null pointer dereference (coverity-1026783).
Fix possible null pointer dereference (coverity-1026784).
Fix possible null pointer dereference (coverity-709349).
Fix possible null pointer dereference (coverity-1026785).
Fix possible null pointer dereference (coverity-1026786).
Fix possible null pointer dereference (coverity-1026787).
Fix possible null pointer dereferences (coverity-1026797).
Fix possible divide by zero (coverity-1026781).
Fix superfluous assigment in initialization (coverity-1026782).
Fix valgrind errors in properties unit test.
Fix possible null pointer dereference (coverity-1026801).