Start VLC with Playback Speed Increased

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http://askubuntu.com – I know that I can change the setting for playback in settings and this will affect vlc globally. However, I don't want EVERY file to be played faster, only mp4 files. Therefore, I figure I can setup a separate application .desktop file with a custom command that can set the playback speed on start. Does anybody know the configuration setting in command-line to increase playback speed? Thanks! (HowTos)