On Tuesday 20 May 2003 11:25, Jason Wood wrote: > In this scene, we have an effect that takes a single track as input. A > video effect is applied called "textmaster", which presumably draws some > text over the top of the video clip. The effect has two parameters - font > and size. The font is defined to be spacetoa.ttf, and the size (of the > font, or of the entire displayed text?) changes over time.
'size' is the size of the font. eventually this will become redundant with the 'height' and 'width' parameters. The idea is to specify a box on the screen which defines the text size(width/height). but that is not yet implemented > A few questions : > > Do we need to specify the number of tracks in the <effect> tab? This could > be determined easily as we parse the <inputs/> section of the effect. In principle, yes. But this little redundancy is very helpfull at this point. > I think this question is something that we haven't really discussed yet : > what effects do we need, and how should they be implemented? I bring this > up because, for example, it is possible that we would want to have text > displayed on screen that is not attached to any underlying clip. In the > interface, this could be shown by dragging a "text clip" onto the screen > and filling out it's parameters. That is trivial. The underlying 'media' (in piave terms) would be a ColorStill, where the color can be 100% transparent. > Displaying text could be treated as a "generate text clip" operation, > followed by an "overlay" operation, and the position of a clip could be > modified by a generic "translation" operation, or it can be special-case. > > Have you had any thoughts on this? Yes, I though this through a couple of times. All functionality is already there. We don't need a 'text clip'. Just take a ColorStill (transparent or not, the color (including alpha channel) can also be dynamic) and then apply a text-effect. You can e.g. 'overlay' this track onto a video track. Or Have a crossfade transition between them, whatever, everything you need for that already works with the current setup. Cheers, Rolf *************************************************************** Rolf Dubitzky http://hep.phy.tu-dresden.de/~dubitzky e-mail: Rolf.Dubitzky at Physik dot TU-Dresden dot de ***************************************************************
