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  1. Alpha transparency in Chrome video | Blog | Chrome for Developers

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    We can think of lots of interesting use cases for video alpha transparency: games, interactive videos, collaborative story telling (add your own video to a background video/image), videos with alternative characters or plots, web apps that use overlay video components. Happy film making!
    How did they do it? Chrome 31 now supports video alpha transparency in WebM. In other words, Chrome takes the alpha channel into account when playing ' green screen ' videos encoded to WebM ( VP8 and VP9) with an alpha channel. This means you can play videos with transparent backgrounds: over web pages, images or even other videos.
    Check if your video contains an alpha channel. How do I check if my video file has transparency? Simply drag your video file onto the file browser button above, or click it to open Finder and select your video. We ' ll overlay your video onto an image so you can check for transparency.
    Uses web page background color, and fully transparent pixels are transparent. This is another acceptable thing to do if the browser cannot support true alpha transparency. Uses image's background color, and fully transparent pixels are transparent.
  3. Transparent Video Checker | Tools

  4. PNG transparency test - entropymine.com