Frage von silentzero:
If I want to export a video with alpha channel does not work. Where I've masked it is in the final video only black. 
 I export it as either QuickTime or as Tiff with RGB + Alpha. Does not. I've forgotten what?
 Antwort von  matte:

So no Quicktime supports alpha channels, so dus need rausrechnen as single sequence! Which programs are you working on? Have a go at times rauszurechnen as PSD sequence because mitspeichern Photshopdateien definitely en alpha channel information!
 Antwort von  Jörg:

Hi, 
 QT supports alpha channels very well, it mus be halt QT animation. 
 Put time in your video editing program on a different Überlagerungsspur.Ein including footage on track 1 You'll see that your black is transparent. 
 Gruß Jörg
 Antwort von  silentzero:

So this now works with the Quicktime times, thank you. With the other try, I still around.