Crop decoded data intensively

[LC]

After a while of googling i found out that i will have to block videocrop
pads close to this way : 

gst_pad_set_blocked (pad, TRUE);
 g_object_set (videocrop, "left", hcrop, "top", vcrop, NULL);
gst_pad_set_blocked (pad, FALSE);

So, if that is the only way to change cropping region, how it affects buffer
timestamps. Damage ?! 
If it brakes correct timestamps, is it possible to preserve timestamp before
crop and add to buffer before pushing on src pad ?   



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