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https://community.adobe.com/t5/media-encoder/how-to-render-alpha-rgb-with-h-264-format/td-p/7338598
You can render your RGB and alpha (matte) channel separate from each other, that way you can get away with pretty small file sizes. H264 does not support integrated alpha channels, even prores only does that in 4444 quality.
https://stackoverflow.com/questions/5055962/how-to-create-an-h264-video-with-an-alpha-channel-for-use-with-html5-canvas
QuickTime’s plumbing is receiving significant upgrades in Leopard. There have been significant enhancements in handling the H.264 encoding. Also, transparent alpha layers, an optional part of the H.264 specification, are now supported in H.264-based QuickTime movies. And finally, QuickTime supports 64-bit.
https://community.articulate.com/discussions/articulate-storyline/transparent-background-video-support
The MP4/H.264 file type does not support alpha channel (not specific to Articulate tools) A .webm video format is an option for transparency, but we don't support that based on their lack of browser support.
https://docs.unity3d.com/Manual/VideoTransparency.html
During transcoding, Unity inserts the alpha into the color stream so it can be used both with H.264 or VP8. Omitting the transcode operation leaves the ProRes representation in the Asset, meaning the target platform has to support this codec (see documentation on …
https://forum.videohelp.com/threads/372859-H265-HEVC-encoder-which-supports-alpha-channel
Oct 02, 2015 · JPG does not support transparency/alpha (without resorting to an odd, rare hack). And using JPG's DCT/block compression on an alpha channel is probably the worst thing you can do to its utility as an alpha. @Gyan, I'm pretty sure that at this time there is …
https://www.wowza.com/community/questions/331/how-to-encode-h264-flv-video.html
Hello, we produced some semi-transparent videos using Adobe After Effects. Now I want to put them on our web site and stream from Wowza. In After Effects I can produce flv videos, but the only available codecs are Sorenson Spark (which does not support alpha-channel) and On2 VP6.
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