In video rendering, change from EVR to internal renderer overlay (default).
CoreAVC - Wikipedia, the free encyclopedia is at this moment the lightest AVC (H264, VC1) decoder. 720p files come usually in MKV container with x264 codec or in WMV container with VC1 codec.
480p is a standard DVD quality, while 720p (720i), 1080p (1080i), 1440p are High Definition (HD) standards. If you can play a 720p, surely you can play 480p
480, 720, 1080....that means vertical resolution:
720p - Wikipedia, the free encyclopedia means an horizontal resolution of 1280 pixels (1280x720 usually for 16:9 AR or 1280x544 for 2,35 AR)
1080p - Wikipedia, the free encyclopedia means 1920x1080
P stands for
Progressive scan - Wikipedia, the free encyclopedia (the way picture is generated) while I is for
Interlace - Wikipedia, the free encyclopedia