Also, Magic YUV and UT Codec (both AVI) support Alpha, but you'll need to do them from within Happy Otter.

DNxHD (.MOV) used  to be my choice for Alpha, but UT took the cake in my latest tests. UT 422 is both smaller and higher quality in informal testing.

Thanks for all the answers and solutions. The reason for me to use the quicktime codec is/was the very small filesizes it generates of my selfmade graphic animations (lowerthirds etc) and to use them in other projects. Of course I could use for this purpose also the nesting function of Vegas but since I do a lot of editing with VegasMovieStudio, this is no option.

I think, I will reinstall QuickTime 7.

@joelsonforte.br your link doesn't work.

There's a description of "how" to to perform the necessary modification on page 2 so that avi codecs other than uncompressed can be used inside of Vegas. You will need a hex editor.

https://www.vegascreativesoftware.info/us/forum/why-alpha-channel-on-uncompressed-only--83354/?page=2

@Joelson_Forte your link doesn't work.

If you copy'n'paste the link text the link does work...

@wwaag that's amazing. Can't wait for the official release! Rendering alpha files with that small of a file size is worth a purchase on it's own.

Quick question about the quality of those small, transparent files. Are they nice and sharp/crisp when you add them to projects? Would you use the Straight unmatted or premultiplied option when removing the backgrounds? Also how do they look when you add motion blur to it and then render it with a transparent background?

@ScrapyardFilms Item for your next video tutorial.

@3POINT I have a good one on rendering with transparent backgrounds already but Wayne's HOS definitely makes my way obsolete if the quality holds up with those microscopic file sizes. If I do some testing with it and get great results, I'll definitely add it to the list of tutorials. It'll get HOS in to the eyes of more VEGAS users for sure.

I don't know how microscopic small the files are with HOS, till now I was always satisfied with the quality and small filesize generated with Quicktime.

@ScrapyardFilms

Good questions.

"Are they nice and sharp/crisp when you add them to projects?" Most of the codecs are considered "lossless" so you should not see any significant quality loss.

"Would you use the Straight unmatted or premultiplied option when removing the backgrounds? Also how do they look when you add motion blur to it and then render it with a transparent background?"

That's really up to the user to decide. HOS only provides a tool for rendering using a choice of codecs. It doesn't develop the codecs--it only provides a relatively easy means of accessing them from the Vegas timeline.

I don't know how microscopic small the files are with HOS, till now I was always satisfied with the quality and small filesize generated with Quicktime.

I have not used it for transparency recently, but I have vague memory of being alarmed at how low the bitrate was, considering transparency backgrounds and greenscreen work should be of the highest quality encode for least amount of problems. Is it possible to use any bitrate or artificially constrained to only low bitrates using quicktime for transparency

On few simple tests the dll heck didn't work well in VMS16, but png sequence went clean and lean.

Using waag´s procedure my result is VP 17 Build 421 Offset 3CD22, 75 0A replaced by 90 90;

Thanks to malowz and waag

Malowz is the genius in figuring out "what" to change. Once you know that, figuring out "how" is pretty simple in comparison.

Is Quicktime installed on your Windows 10 system and is the Quicktime support enabled in VP17 (Options/Preferences/Deprecated Features)?

Another choice is using uncompressed AVI which supports alpha channel.

Do you know where to activate this in Vegas Pro 16?