Trying to crop 4608x2160 to 3840x2160.
Seems to be easy until exporting, but nothing is cropped in the exported file.
I have tried so many times with different setting to no avail.
Exporting R3D trim
Reduser threads: nothing useful.
DaVinci Resolve: no result.
R3D trim doesn't transcode, it simply pulls the requested frames from the raw file, and makes a new raw file.
You can almost think of this is a data transfer in that it is merely a copy of the same size frames from a longer amount of frames to a shorter amount.
If you decide to transcode to another intermediate codec, then you can crop to a desired final frame size.
The nice thing about Red, is that the crop data is stored in metadata. So presumably, if your host app can read it, you can setup crop markers (or if you set user/action guides during the shoot) and have that information follow to the trimmed R3D. Unfortunately, I don't think Resolve uses this metadata.