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https://stackoverflow.com/questions/10815805/mpeg-4-and-alpha-transparency-the-ongoing-saga
Jan 16, 2016 · The support for alpha channel in the H.264 decoder is now available in Intel® Integrated Performance Primitives 6.0 version. The MPEG4 Simple Studio Profile supports auxiliary channels, which could be used for alpha or depth --...
https://community.adobe.com/t5/after-effects/alpha-channel-in-media-encoder-cc-2018/td-p/9739994
The MP4 file format does not support an Alpha Channel. If you require an Alpha Channel for your MP4, you will need to render the Alpha Channel as a separate movie. IOW, One movie for the RGB Channels and another movie for the Alpha Channel. Use QuickTime Animation or DNxHD CODECs if you want a single file output with both the RGB and Alpha Channels.
https://stackoverflow.com/questions/9319579/convert-mov-to-mp4-and-keep-alpha-channel-using-ffmpeg
h.264 does not support an alpha channel. You could use ffmpeg to encode to the Quicktime Animation codec, that file format supports an alpha channel. You might also try a newer format like WebM that supports an alpha channel.
https://video.stackexchange.com/questions/23893/make-white-background-in-mp4-movie-transparent
The MP4 format doesn't support an Alpha channel. The question you've asked is very broad, and I've tried to answer to a certain extent below. However you may need to decide what route you're going to try and then researching that route or asking further, more specific questions.
https://community.adobe.com/t5/media-encoder/how-to-render-alpha-rgb-with-h-264-format/td-p/7338598
h264 is unnable to export aplha channel (transparency) so you have to use something else to render it. I'm not familiar with Twitch channel settings but mae there is some other file format that can give you alpha channel f.eg. swf
https://forum.shotcut.org/t/how-to-make-video-with-transparency/10743
Jul 24, 2019 · Keep in mind that both mov and mp4 are not codecs but containers. mp4’s don’t support alpha channel. mov does provided you export in a codec that has 4444, Pro-res or Apple Animation Codec come to mind. It’s easy for you to check, export your video, then, open a new SC project put …
https://docs.blender.org/manual/en/latest/files/media/video_formats.html
FFV1 is a lossless intra-frame video codec. It can use either variable length coding or arithmetic coding for entropy coding. The encoder and decoder are part of the free, open-source library libavcodec in FFmpeg. Supports an alpha channel. Flash Video See Containers. H.264 A modern variation of the MPEG-4 family, this lossy codec is very ...
https://www.digitalrebellion.com/blog/posts/list_of_video_formats_supporting_alpha_channels
It is a list of popular video formats that support alpha (transparency) channels. It also includes a few image formats that are used for video work, like TIFF. It also includes a few image formats that are used for video work, like TIFF.
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