Hi,
I'm implementing the pitivi timeline in a separate app. The timeline is 
composed of picture streams.

When I insert an image at the start(0) position of the video tack. I 
have a funny video fade effect, on the first 2 picture stream.  If I 
insert the picture stream in other position : no video fade effect.
I solve the problem by adding a timeline.disableEffects / 
timeline.EnableEffects in timeline objects creation.
But I don't understand the deep goal of the disable/Enable function ? 
and BTW what they actually prevent ?

In disableUpdate function desc :" Block internal updates. Use this when 
doing more than one consecutive modification in the pipeline." But if I 
add 2 picture stream , I have no video fade effect.  Only with one stream.

Cheers
Nico





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