This Newbie Mavericks OS X 10.9 user, (experienced Maverick Meerkat ubuntu user) uses this solution.
Install Maverick Meerkat in VirtualBox, share disk between Mavericks and Maverick, use VLC in OS X,
and now I have instant viewing of all content in OS X, and instant reviewability/editability in ubuntu.
This gives me the best of the closed Mac world and the best of the open linux world.
Slight complexity involved in setting up is rewarded with persisting ease of use afterwards.
1. Install VirtualBox
2. Acquire 64 bit ubuntu ISO image
3. Run VirtualBox, make a new VM, tell it to use the ISO image
4. Install ubuntu, give yourself a login name (I will use "yourname"), login, and launch a terminal
4.1. sudo apt-get update; sudo apt-get upgrade; sudo apt-get install dkms;
5. Tell VirtualBox what directory (folder) you wish to share (i.e. legacy)
6. Remove ubuntu ISO image
7. Reboot VM
8. Tell VM to use /Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso (I used a soft link)
7. Follow instructions for installing Guest Additions
8. Launch a terminal
8.1 mkdir ~/Desktop/legacy; sudo mount -t vboxsf -o uid=1000,gid=1000 legacy ~/Desktop/legacy
9. Now the Mac legacy folder is visible in ubuntu, and both may operate on the contents at will.
To make the mount persist across boots, edit the ubuntu file /etc/rc.local, and before the final "exit" command put this:
mount -t vboxsf -o uid=1000,gid=1000 legacy /home/yourname/Desktop/legacy