[Uli Kilian]

Reuben – Thanks a lot!
The qtrle option works. Finally I can encode with alpha channel.
Thanks for sharing!

However – as the PNG compression is a bit more efficient it would be nice to get that encoded with ffmpeg.
If anyone has any idea – please share.
I tried to put the “-pix_fmt argb” option in front of the -i option – but didn’t make any difference. Nor did all the others (abgr, rgba, etc).

Anyway.
Thanks again, Reuben!

Uli