I tried this out, and it turns out it breaks pitivi.  I tested the old and new versions of python-gstreamer1 and gnonlin and it's definately GES that breaks it.

I'll file a bug with pitivi.

https://bugzilla.gnome.org/show_bug.cgi?id=726715

From the Pitivi bug:

"It is already fix in pitivi master. The 0.93 release is comming very soon :)"

Heads up, the 0.93 Pitivi release is now available (announcements coming up, but the tarballs are on gnome's FTP servers as usual). Release notes here: http://wiki.pitivi.org/wiki/0.93

Thanks, I tried it and it all works, I'll get this out ASAP.

pitivi-0.93-1.fc20,gst-editing-services-1.2.0-1.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/pitivi-0.93-1.fc20,gst-editing-services-1.2.0-1.fc20

Package pitivi-0.93-1.fc20, gst-editing-services-1.2.0-1.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing pitivi-0.93-1.fc20 gst-editing-services-1.2.0-1.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-4222/pitivi-0.93-1.fc20,gst-editing-services-1.2.0-1.fc20
then log in and leave karma (feedback).

Looks like there is a dependency problem in the spec file: pitivi 0.93 requires at least gnonlin 1.2 (and likely also gst-editing-services >= 1.2). If a user updates to pitivi 0.13 but does not update gnonlin and/or gst-editing-services pitivi won't start. Should I file a separate bug for that or do you just want to fix it here?

The updates pitivi and gst-editing-services are linked, and I've also got one in the pipe for gnonlin: https://admin.fedoraproject.org/updates/FEDORA-2014-4153/gnonlin-1.2.0-1.fc20

I'll push them all at the same time.

Package gst-editing-services-1.2.0-1.fc20, pitivi-0.93-2.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing gst-editing-services-1.2.0-1.fc20 pitivi-0.93-2.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-4222/pitivi-0.93-2.fc20,gst-editing-services-1.2.0-1.fc20
then log in and leave karma (feedback).

Package gst-editing-services-1.2.0-1.fc20, pitivi-0.93-3.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing gst-editing-services-1.2.0-1.fc20 pitivi-0.93-3.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-4222/pitivi-0.93-3.fc20,gst-editing-services-1.2.0-1.fc20
then log in and leave karma (feedback).

gst-editing-services-1.2.0-1.fc20, pitivi-0.93-3.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.