[performance] slowdown when project resolution != clip resolutions
Submitted by Jeff F.T.
Assigned to Jeff F.T.
I just tested pitivi 0.13.4's playback performance on a decent machine (Pentium M 1.8 GHz), and if your project resolution !== the clips resolution, the playback performance is destroyed; it can't playback 500x282 theora smoothly if you use 1280x720 as the project resolution, for example. If you set the project resolution to 500x282, then it is smooth enough to playback.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=613416