Multiple improvemetns for dance filter.
Multiple improvemetns for dance filter.

* Fix unique ID to actually be unique.
* Fix background color to be non-transparent.
* Fix input image size detection.

zzhhui/mlt,zzhhui/mlt,wideioltd/mlt,xzhavilla/mlt,wideioltd/mlt,j-b-m/mlt,anba8005/mlt,siddharudh/mlt,mltframework/mlt,zzhhui/mlt,xzhavilla/mlt,siddharudh/mlt,siddharudh/mlt,anba8005/mlt,mltframework/mlt,xzhavilla/mlt,j-b-m/mlt,xzhavilla/mlt,anba8005/mlt,siddharudh/mlt,j-b-m/mlt,anba8005/mlt,siddharudh/mlt,mltframework/mlt,xzhavilla/mlt,siddharudh/mlt,wideioltd/mlt,j-b-m/mlt,mltframework/mlt,wideioltd/mlt,zzhhui/mlt,siddharudh/mlt,mltframework/mlt,mltframework/mlt,siddharudh/mlt,j-b-m/mlt,zzhhui/mlt,mltframework/mlt,j-b-m/mlt,anba8005/mlt,j-b-m/mlt,siddharudh/mlt,anba8005/mlt,wideioltd/mlt,wideioltd/mlt,zzhhui/mlt,anba8005/mlt,zzhhui/mlt,xzhavilla/mlt,mltframework/mlt,zzhhui/mlt,anba8005/mlt,mltframework/mlt,wideioltd/mlt,xzhavilla/mlt,j-b-m/mlt,xzhavilla/mlt,xzhavilla/mlt,mltframework/mlt,anba8005/mlt,j-b-m/mlt,wideioltd/mlt,wideioltd/mlt,j-b-m/mlt,zzhhui/mlt