Alpha Channel Support for VP8/VP9 (WEBM) in BigBox Theming

BigBox does not currently support video transparency, which limits theming possibilities. VP8 and VP9 (WEBM) videos support alpha channels, are open source, widely used, and already work correctly in VLC and K-Lite.

https://www.webmproject.org

In BigBox, these videos play but the alpha channel is ignored and replaced with black or white. Native support would allow clean, background-free system and platform videos, enabling proper layering and more modern themes.

If native alpha support is not possible, an automatic PNG mask applied by filename could be a fallback, but this is more limited than true alpha support.

Adding VP8 and VP9 alpha channel support would be a clear improvement for BigBox theming.

Original discussion :

https://forums.launchbox-app.com/topic/93038-alpha-channel-support-for-videos-in-bigbox-themes