[ubuntu] HD video editing video compression problems

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http://ubuntuforums.org – Ubuntu is great but I cannot edit HD video or compress video files. I tried video editing using avidemux but the audio comes out too fast. I am also trying to compress video files but nothing seems to work. I tried transmageddon and when I press the transcode button the progress meter doesn't move and nothing happens. I also tried winff and the black terminal screen opens telling me it failed and to press continue. I already installed a bunch of plugins but still the same problems. with windows i just installed xvid and divx and used either format factory or SUPER and everything went smooth. (Hardware)