Maybe Apple Quicktime can do the job for you with the following handy tips
Pause / Play: Tap spacebar.
Pause: Press K.
Play Forward: Press L (multiple taps will increase speed of playback).
Play Reverse: Press J (multiple taps will increase speed of backwards playback).
Slow Motion Forward: Hold K+L together or hold right-arrow.
Slow Motion Reverse: Hold J+K together or hold left-arrow.
Frame-By-Frame Forward: Press right-arrow or K+L.
Frame-By-Frame Reverse: Press left-arrow or J+K.
Loop Playback: Press Cmd+L together.
View Full Screen: Press Cmd+F together.
Increase Volume: Tap up-arrow.
Decrease Volume: Tap down-arrow.
Can't you download vlc for tiger? You can find a copy here:
http://www.videolan.org/vlc/download-macosx.html or direct copy
http://sourceforge.net/projects/vlc/files/0.9.10/macosx/vlc-0.9.10.dmg/download
Or is the problem that this version doesn't support slow motion playback? Then we will search some more
greetz