I have tried making a scene with a movie in the compositor for colour effects.
Then I add that scene as a strip to the VSE.
The compositor input doesnt appear in the VSE viewer window, it only shows the 3D object (default box).
I tried a UV/image editor window display of the viewer node from that comp, but it won't update while scrubbing the timeline.
Also i noticed that, the rendered output from the nodes is clipped. If I change the output size to 50% of render size then the output node is a 50% crop of source. The viewer node remains correct however. In old versions output node resized dynamically.
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**SORRY** I meant that the VSE won't appear in the compositor! I realise that the compositor is last in the render chain after VSE, but I cannot get the VSE output to appear as a "scene render layer" in the compositor. The VSE renders correctly (in place of 3D scene) but only a black window appears if Sequencer is active.
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There are two disctinct issues here;
- in 2.5, the previews for the Scene strips are rendered real-time, using opengl. No compositing or real render happens.
If you press F12 for render this goes fine
- The scene strip render happens "off screen" using an opengl buffer. Some graphics cards don't support random sizes, but only multiples of 256 or 512 pixels.
If you want to combine render scene + composite + VSE, the execution is in this order; VSE is last in the chain.
Using a "Scene" in the VSE was actually only meant for projects to manage edits of many scenes in a single .blend file. It's barely functional interactively.