UnpackVideo: Allow to overload output format.
UnpackVideo: Allow to overload output format.

tschmidt23/Pangolin,mp3guy/Pangolin,tschmidt23/Pangolin,wxdzju/Pangolin,renzodenardi/Pangolin,mp3guy/Pangolin,randi120/Pangolin,randi120/Pangolin,stevenlovegrove/Pangolin,wxdzju/Pangolin,stevenlovegrove/Pangolin,mp3guy/Pangolin,renzodenardi/Pangolin,stevenlovegrove/Pangolin,tschmidt23/Pangolin