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I have installed ubuntu-restricted-extras but when I play a movie such as this http://media.railscasts.com/videos/250_authentication_from_scratch.mov it plays the sound but the video is just a black screen.

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It works for me. Did you install the restricted extras? That contains media codecs and the like to decode the video. – The Lord of Time May 2 '11 at 22:31
What is the output of apt-cache search gstreamer | grep gstreamer? – RolandiXor♦ May 3 '11 at 0:00
This question appears to be abandoned and unanswered. This will be closed. If this question is still valid, please add more detail and flag for it to be reopened. – fossfreedom♦ Feb 18 '12 at 22:10

closed as too localized by fossfreedom♦ Feb 18 '12 at 22:11

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