MediaCorp HD5 or HD5 (Chinese: 高清5頻道, formerly known as MediaCorp TV HDTV or HDTV) is Singapore's first 24 hour digital free-to-air high-definition television channel, simulcasting high-definition version of MediaCorp TV Channel 5 programming when available. It is the first digital terrestrial television broadcast high-definition channel in Southeast Asia and also first in the world to use MPEG4/AVC compression.There are about 10-hours of True HD programmes shown on HD5 every week.