Description of problem:
After I install pitivi in Fedora 20 with xfce, I can not start pitivi. I tried to start pitivi from terminal and it says 

ERROR - The following hard dependencies are unmet:
==================================================
- Clutter: 1.12.0 or newer is required, but was not found on your system.

Version-Release number of selected component (if applicable):
Fedora 20 
3.13.5-202.fc20.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Install a pure Fedora 20 x86_64 with xfce
2.sudo yum update
3.sudo yum install pitivi
4.pitivi

Actual results:

ERROR - The following hard dependencies are unmet:
==================================================
- Clutter: 1.12.0 or newer is required, but was not found on your system.

Expected results:
Pitivi started

Additional info:
After I installed clutter, still other error
$ sudo yum install clutter
$ pitivi

ERROR:root:Could not find any typelib for GtkClutter
Traceback (most recent call last):
  File "/usr/bin/pitivi", line 142, in <module>
    _run_pitivi()
  File "/usr/bin/pitivi", line 116, in _run_pitivi
    import pitivi.application as ptv
  File "/usr/share/pitivi/python/pitivi/application.py", line 43, in <module>
    from pitivi.mainwindow import PitiviMainWindow
  File "/usr/share/pitivi/python/pitivi/mainwindow.py", line 49, in <module>
    from pitivi.timeline.timeline import Timeline
  File "/usr/share/pitivi/python/pitivi/timeline/timeline.py", line 26, in <module>
    from gi.repository import GtkClutter
ImportError: cannot import name GtkClutter

Then pitivi starts without error after I install clutter-gtk
So two dependences are missing for the package.