Revert part of c48ed7 that caused performance regression.
Revert part of c48ed7 that caused performance regression.

Videos with full color range like yuvj420p were converted unnecessarily
to RGB and back to YUV. If a video does not indicate is has full color
and you want to override it, then use set.force_full_luma=1.

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