[gst-devel] Video transitions using gnloperation

[Edward Hervey]

On Mon, 2011-01-03 at 23:23 -0700, Lane Brooks wrote:
> I have a gnlcomposition containing two video sources. I would like to 
> apply a smpte transition from one source to the next.
> 
> I have tried overlapping the two gnlsources by 3 seconds. I then put a 
> 'smpte' element in a 'gnloperation' and add the 'gnloperation' to the 
> 'gnlcompostion'. The addition of the gnloperation doesn't seem to do 
> anything. The resulting video is the same regardless of whether I add 
> the gnloperation or not. The result is always that the second video 
> takes over during the period of overlap. Here is code I have (in python):
> 
>          comp = gst.element_factory_make("gnlcomposition")
>          src1 = gst.element_factory_make("gnlfilesource")
>          src2 = gst.element_factory_make("gnlfilesource")
> 
>          comp.add(src1)
>          src1.set_property("location", "/test1.mp4")
>          src1.set_property("start",          0 * gst.SECOND)
>          src1.set_property("duration",       5 * gst.SECOND)
>          src1.set_property("media-start",    0 * gst.SECOND)
>          src1.set_property("media-duration", 5 * gst.SECOND)
> 
>          comp.add(src2)
>          src2.set_property("location", "/test2.mp4")
>          src2.set_property("start",          2 * gst.SECOND)
>          src2.set_property("duration",       5 * gst.SECOND)
>          src2.set_property("media-start",    0 * gst.SECOND)
>          src2.set_property("media-duration", 5 * gst.SECOND)
> 
>          op = gst.element_factory_make("gnloperation")
>          tran = gst.element_factory_make("smpte")
>          tran.set_property("type", 234)
>          tran.set_property("duration", 3 * gst.SECOND)
>          op.add(tran)

  Set the [media-]{start|duration} propertie son op also

>          comp.add(op)
> 
> Anyone know if using an smpte transition is possible, and if so, what I 
> am doing wrong?
> 
> Thanks,
> Lane
> 
> 
> 
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