Crop decoded data intensively

[LC]

Hello, 

I need advise in such scenario. 
I got rtspsrc stream mainly like this : 

rtspsrc - > .... -> videocrop -> .... -> flvmux ->.... rtmpsink
alsasrc-> ...............-> faac ->............----^

Rtspsrc  fps=25/1. 
And i need to change for my reason videocrop properties for every processed
frame - 25 times per second.  
I need that to preserve correct timestamp  even if i change caps for
videocrop so that it does not affect other stream branches to synchronize on
sync. 

As i had no experience on changing caps so intensively, maybe someone knows
what result i could get and what may occur. Do  i have to change stream
playing state to stop and that to play or i can change tham on a fly ? Is
there possible some choppy video playback ? 

Any thoughts or advise is welcome! 

Thanks in advance! 

 



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