gnonlin gnlurisource combine videos

[Nicolas Dufresne]

Le mercredi 30 octobre 2013 à 20:08 -0700, troywang a écrit : 
> why is gnonlin-1.1.90's gnlfilesource missing? And thus how to use gnonlin to
> combine some mp4 files? I have to use gnlurisource ?

Yes.

> GObject.threads_init()

That is not needed anymore.

> Gst.init(None)
> 
> class Main:
>         def __init__(self):
>                 # creating the pipeline
>                 self.pipeline = Gst.Pipeline()
>                 self.bus = self.pipeline.get_bus()
>                 self.bus.add_signal_watch()
>                 self.bus.connect('message::eos',self.on_eos)
>                 # creating a gnlcomposition
>                 self.comp = Gst.ElementFactory.make("gnlcomposition",
> "mycomposition")
>                 self.pipeline.add(self.comp)
>                 self.comp.connect("pad-added", self.OnPad)
>              
> 
>                 # create a filesink
>                 self.filesink = Gst.ElementFactory.make('filesink',
> 'filesink')
>                 self.filesink.set_property('location','test.mp4')
>                 self.pipeline.add(self.filesink)

When using GNL, you can't have non-gnl based sources.

> 
> 
>                 # create a gnlurisource
>                 self.video1 = Gst.ElementFactory.make("gnlurisource", "aaa")
>                 self.comp.add(self.video1)
> 
>                 # set the gnlurisource properties
>                 self.video1.set_property("uri", "aaa.mp4")
This is not a valid URI. A file base URI should look like
"file:///home/test/aaa.mp4". 
>                 self.video1.set_property("start", 0 * Gst.SECOND*0)
>                 self.video1.set_property("duration", 5 * Gst.SECOND)
It's a good habit to also set the inpoint and priority. 
> 
>                 # create a gnlurisource
>                 self.video2 = Gst.ElementFactory.make("gnlurisource", "bbb")
>                 self.comp.add(self.video2)
> 
>                 # set the gnlurisource properties
>                 self.video2.set_property("uri", "bbb.mp4")
See previous comment. 
>                 self.video2.set_property("start", 0 * Gst.SECOND*1)
>                 self.video2.set_property("duration", 5 * Gst.SECOND)
>                 self.pipeline.set_state(Gst.State.PLAYING)
In newer version of GNL you need to emit the "commit" action in order
for you changes to take effect, but I think we wanted the initial commit
to be automatic, I'll check with the others.

Hoping this information will help.

Nicolas