[PD] transparent video or: how to concatenate strings?
cgc at humboldtblvd.com
Tue Jul 20 19:51:03 CEST 2004
On Jul 20, 2004, at 9:51 AM, andreithomaz wrote:
> hello list,
> I am using GEM on WindowsXP. I would like to mix videos with
> transparency (that is, with alpha channel). But I cann't find a codec
> that supports that. Do you know anyone?
You are right that video has no alpha channel so finding a video codec
that supports one is nearly impossible exactly for that reason. I
would suggest looking into computer graphics codecs like Apple/Adobe
Animation included with Quicktime. It will include alpha when the
color depth is set to 'Millions of Colors+'.
> A way to solve the problem would be to show a image sequence (PNG
> files with 32 bit color). But, for that, I would have to transform a
> number into a string, and concatenate it with a string (for exemple,
> "frame" + number + ".png"). Is it possible to make that?
There are utilities to put image sequences into .mov or .avi containers
- I use Quicktime Pro to load the image sequence GEM writes to disk and
make it into a single .mov file. This would be a lot easier than what
> thanks a lot,
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