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XMovie is mainly intended for uncompressed movie playback, nonstandard output from Cinelerra, and testing decoder libraries. It's not intended for low resolution, low bitrate internet downloads. Your luck will improve with something like M Player
6 channels of audio can be sent to a soundcard supporting 6 channel audio. More importantly, HDTV program and ATSC transport streams play back. These streams are usually obtained through a capture board like the WinTV HD, set top box hacking, or other means. Forget about downloading HDTV moviez from the internet.
It won't play any Quicktime movies you download from the internet because those are compressed with Sorenson Vision. While Quicktime isn't the standard for movies on UNIX and it's not official Microsoft software, it's pretty good at storing uncompressed movies. Quicktime for Linux supports OGG Vorbis and MPEG-4, roughly equivalent to the popular 'Soft codecs but free.
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The package is available from the download page.
Use rpm -i --force --nodeps to install it.
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$medium_font 1.9.12 Merge with current Quicktime and Libmpeg3.