GNOME Bugzilla – Bug 650927
Effects requiring an alpha channel won't work unless you set the clip opacity to less than 100 percent
Last modified: 2013-09-30 19:16:43 UTC
Since, for performance reasons, we have a "passthrough" (that is, no compositing is attempted) in videomixer whenever a clip's opacity curve is set to 100%, this means that applying effects such as "alpha" onto a clip will not work until you set the clip opacity to 99% or less. Bug 629808 is for still images.