[ubuntu] Cannot play HD video

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http://ubuntuforums.org – Hi I am trying to play 1080p HD video in mp4 format. The file has been downloaded and saved to my hard drive. The video will play then stop using movie player or AVC. I am using a Netbook. My nettbook has an intel processor but when I go into system info it says grahpics "unknown". Any ideas? (Hardware)