avidemux 2.5.2: xvid movie without picture on slack 12.2

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http://www.linuxquestions.org – I´ve a strange issue with alien bob´s 64bit package of avidemux 2.5.2: A movie converted to xvid is not playable on my old notebook running slackware 12.2. I hear sound but see only a black screen. Neither kaffeine 0.8.8 nor vlc 1.0.1 shows the movie.On Slackware 13_64 there is no problem with any player. Even my wife can watch the movie on her windows machine with vlc 1.0.0. I upgraded avidemux from 2.4.4 to 2.5.2 and xvidcore 1.2.2 to the latest version from alien´s repository. What did I miss? (HowTos)