Hello I'm trying to create an end card transition for my youtube videos. I have created the animation in VSDC, basically it entails of a shutter being pulled down over each video where it will say "please subscribe" and have other videos to view. The shutter starts at the very top of the frame and then scrolls down like a blind or curtain to cover the entire video. Please see a mock-up in the first 3 images so you get what I mean, the actual animation doesn't matter as long as you understand the concept. It's fully created as a sprite and it works fine. The only thing is I want to save this animation as a .mp4 so I can then just add it to the end of each video as a template. However I can't get rid of the default background in VSDC. I can set the background transparency to 0 to make it transparent in the editor (see image 5), but whenever I export it, I'm left with a black background. I can change the background colour and even when set to transparent it will show up as that colour in the exported file. It's like VSDC can't export a transparent video. If i then try put the outro over the end of the video, it's suddenly going to be covered with a black background before the shutter comes down which ruins the effect. I want it to transition perfectly over whatever video I'm using.

You can see from the fourth image that I have music playing (which will come on over the main video to indicate the end) and after a few seconds, I have the animation come in (which is a sprite made up of other sprites). You can see that the image background is indeed transparent so I can place the main video there, but as I've said, once I export it as an .mp4 to be used as a template, it isn't transparent.

As it stands now I'm able to just save it as a scene and import that scene which contains the sprite animation for each new video I'm making. However sometimes I use other editing software besides VSDC and so regardless I'm forced to put my video into VSDC just so I can add that scene to it. If I could save it as an .mp4 that has no background with only the shutter coming down so I could seamlessly overlay that using any editing software it would be much better. If any one has any ideas to achieve this I'd greatly appreciate it.

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TL;DR I have an end transition overlay made in VSDC I want to save as an .mp4 for use in all videos, but VSDC won't let the background stay transparent. Please help.