On Mac there is no problem. Just don't give a background, use Apple ProRes 4444 codec in export settings and you'll get a video of your CT character with transparent background.
Thank you, that works! I had got it to work once, but then couldn't replicate. I see now the issue was me choosing the wrong codec.
Suggestion, put an "export transparent video" option in the export dialog. The feature is there already (on a Mac anyway) but is basically invisible to many or most users.
Ok, the next issue is getting the two vids to play together nicely. I'm using Quicktime 7 at the moment to put the CT head on top of the video background. Works nicely, except that it looks like videos will have to be the same length.
I realize I'm using outdated software here, so would welcome suggestions of how I can better combine the two videos in to one. Goal, simplest video editor which will do the job.
Lernakow (3/24/2017)If you want to use a background with partial transparency, then you can chroma key the desired colour in Apple Motion (circa $50) or in DaVinci Resolve (free).
Thanks much, downloaded Resolve and will check it out.
I again cast my one little vote for adding video backgrounds to CT. It would be great to be able to add video backgrounds within CT without having to hack the vids together elsewhere. Seems a compelling feature. As example, imagine a CT character on top of a beach image. Now imagine the character on top of a beach video with sound. There's a big difference. the latter is far more compelling and realistic.
Until then, back to hacking. Thanks again!