Effect

Any GStreamer filter can be used as effects in GES.

The only restriction we have is that effects element should have a single [sinkpad](GST_PAD_SINK) (which will be requested if necessary) and a single [srcpad](GST_PAD_SRC).

Note that `gesaudiomixer` and `gescompositor` can be used as effects even though they can have several sinkpads.

GES specific effects:

* **`gesvideoscale`**: GES implements a specific scaling bin that allows specifying where scaling will happen inside the chain of effects. By default scaling can happen either in the source (if the source doesn't have a specific size, like `videotestsrc` or [mixing ](ges_track_set_mixing) has been disabled) or in the mixing element otherwise, when adding that element as an effect, GES guarantees that the scaling will happen in it. This can be useful for example if you want to crop the video before scaling or apply rounding corners to the video after scaling, etc...