I don't understand clearly the request but I'm interested.
Do you need to convert a movie with alpha channel (in which format?) to ProRes 4444 with alpha?
Do you have a sample so I can test?
Thanks for the clarifications, friends. I have little experience with this! it seems I messed up and threw off the wrong file for an example this file has most likely already been converted to prores using the Kyno program (I used it to convert videos to Prores 444 before it stopped developing) The fact is that I have footages in the outdated quicktime .mov format (with an alpha channel) that were not imported into the file cat and compressor. and I have to do their conversion to prores 444 to save the alpha. Transparency is preserved in Kyno. If you add this feature it would be very cool. I hope you will understand me. I'm sorry if I'm misrepresenting my thought)
Yes and no. If you auto-generate proxies on import into FCP and there are 4444 clips among your selection, as of a more recent version FCP is in fact smart enough to NOT make proxies from them with alpha so as to avoid unpleasant surprises. But… at the cost of file sizes obviously.
I would never use a proxy for al alpha channel(ed) video.
Really? I do it all the time for animations that I need to include in proxy-only libraries and want to shrink to a fraction of their original size for collaboration.
in the outdated quicktime .mov format
There's nothing "outdated" about Quicktime. Again: the container format is irrelevant. The only relevant information is CODEC. I can only assume that you mean that they were somehow created with the Animation codec. The only codec until the advent of PR4444 that supported an alpha channel, and is now deprecated, yes. But AFAIK you can use both VLC or Handbrake to open and transcode them.
(I used it to convert videos to Prores 444 before it stopped developing)
KYNO still works just fine and development hasn't officially stopped either.
You're confusing the old QT Framework with the modern media frameworks Apple uses in macOS. ProRes 4444 and all other ProRes flavors have been updated for the new framework. It's not outdated or undeveloped, it is alive and kicking, my friend. .Mov is still a valid file extension as long as the .mov wrapper is not using outdated QT Framework codecs.