'_flags': '-c:v libvpx -quality good -cpu-used 5 -qmin 10 -qmax 42 -crf 18 -b:v 1M -c:a libvorbis -threads 8' stv format within Serif to create video transparencies but Vegas could not read this format.Ĭonclusion - quicktime is the best option for retaining alpha channels and give some compression to avoid huge AVI files.'_flags': '-profile:v main -level 3.1 -c:v libx264 -preset slow -crf 22 -threads 8'

Serif ImpactPlus only has the uncompressed AVI option.

Vegas did not automatically pick up the quicktime alpha channel I had to right click the event and specify the alpha channel.Ĭool 3D Production Studio can produce the uncompressed AVI and has the ability to use the quicktime encoder with the same results. Not sure what the transparency options refer to in these codecs.īoris Red - Using the Quicktime encoder and setting colours to millions+ retains an alpha channel and you get some compression. A couple of the codecs give options for transparency but the encoded file ends up 24bit with no transparency channel.

Transparency in AVI - it has to be 32bit uncompressed to retain the alpha channel. Thanks for the input I have gone through the options and thought I would post it - it may help someone who does a search

Video overlays with scopebox