On Mon, Aug 25, 2014 at 8:57 AM, <ijaureguibe...@lifia.info.unlp.edu.ar>
wrote:
> I'm having a problem with transition composite, blending a PNG image with
> transparency to a solid background. I'm sending a small C++ program that
> shows the problem.
>
>
I strongly discourage you from sending custom code when asking for help
because it is much less convenient than a melt command line or XML. And if
you do want help with your code, I suggest that you explain the nature of
your project, whether it is open source, and where to get more information
about the project and/or its source code.
> I set up a multitrack with two tracks and added a composite transition to
> blend track 1 to track 0. I loaded an image producer for the background and
> another for the image that blends to the back. While running, looks like
> colours are wrong.
>
> The foreground image has a semitransparent black box that should blend
> with background. You will notice a violet line 1px wide near the left edge
> of the box and another green line 1px wide near the right edge of the box.
> Doing the same composition in GIMP shows no lines in the edges.
>
> There is a Makefile to build the example, a c++ source and the 2 images in
> the attachment.
>
This looks OK to me. Does it work for you? If not, it might be a bug in
your version and/or build.
melt -profile hdv_720_25p 00000001.png -track cancha_1.png -transition
composite:0/0:100%x100%:100
If it happens with melt, then try the frei0r.composition transition (no
arguments or properties needed). That will probably give better results and
performance with RGB sources anyways since it is a RGB effect, while
composite is a YUV-only effect, more suitable for video sources.
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