Quoting zmoelnig@iem.at:
[pix_videoYUV]: normally [pix_video] should produce RGBA (values) (but it might produce RGB only, which i'll have to check). on macOS you could use [pix_videoYUV] to get YUV-video, but this really should go into [pix_video] + a [colorspace( message. but of course i cannot really discourage the use of this, as long as there are no alternatives...
the current pix_video in CVS does accept a 'colorspace' message on OSX. 'r' is ARGB and 'y' is YUV. after setting this message the capture components have to be reloaded by sending a 'reset' message to pix_video. this is also the same procedure for resizing using the 'dimen x y' message. the reason for this somewhat odd functionality is that it reduces the risk of crashes while trying to change decompressor components in the middle of the decompression sequence.
there will be a doc, tutorial and/or help file sometime this week for pix_video on OSX.
cgc
so basically, this is a todo-list for developers ;-)
mfg.ad.sf IOhannes