How to segment seek in dynamic pipeline

[xmufzy]

Great, I try autotransition and it worked, but I need to control the
transition type, the default is crossfade, can I change to other type?

autotransition:
*  the track-types is 6
          <clip id='3' asset-id='crossfade' type-name='GESTransitionClip'
layer-priority='1' track-types='6' start='5000000000' duration='1000000000'
inpoint='0' rate='0'      properties='properties,
name=(string)transitionclip0;' metadatas='metadatas;'
children-properties='properties, GESVideoTransition::border=(uint)0,
GESVideoTransition::       invert=(boolean)false;'

* insert transition ,the track-type is 4,  How can I change the transition
type to 6?

 <clip id='3' asset-id='crossfade' type-name='GESTransitionClip'
layer-priority='1' track-types='4' start='5000000000' duration='1000000000'
inpoint='0' rate='0'      properties='properties,
name=(string)transitionclip0;' metadatas='metadatas;'
children-properties='properties, GESVideoTransition::border=(uint)0,
GESVideoTransition::       invert=(boolean)false;'>

====
One more question,
I have some other component write by open-gl ,the component mixer 2 video
and generate a new video segment, How can I make them work with ges?




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