CG Jam

Movie clip Node

Whats it for?? – the movie clip input node.

discover the features of Blenders movie clip compositing node.

Blenders Movie clip node is the node we use to add movie clips to our projects, though it is quite limited and in truth you are better off working with the image input node as this can give you more control over your clip, however the movie clip node does have its uses.

The output sockets.

The movie clip node has six default outputs,

  • Image,
  • Alpha,
  • Offset x,
  • Offset y,
  • Scale and
  • Angle.

The image output is yellow which corresponds to all colour input/output sockets, this would be the main output that you would need to view the pictorial content of your video clip.

the Alpha output is for any transparent content in the video clip, it basically shows the alpha channel as a black and white matte, which you can use as a mask if required. it is highly unusual to have a video with alpha as they generally  dont carry an alpha channel and including one into a video increases the file size to ridiculous amounts! if you require a clip with alpha you are much better off using an image sequence such as a png files.

The offset outputs make the video clip somewhat more useful as they can hold data acquired from the tracking screen. simply add a track to the 2D stabilisation settings, then back in the node editor you can simply connect the offset outputs to the  translate node and the tracking data will be transferred to the clip giving you a quick and easy stabilisation.

of course. its not required to just use it with the tracking you can simply plug it into a translate node to adjust the position of the clip in your view.

scale and rotate work in pretty much the same way, you can use them with the tracking or on there own, they can be plugged into the scale and rotate nodes respectively and used to position the clip anywhere in your view.

for example if you wanted to inset your clip over another so it just appeared in the corner then you would scale it, then offset it into the required position.

all very simple



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