[FFmpeg-user] Couple of questions about GIFs

[pdr0]

But for web supported video in MP4 container, there is no native alpha
channel support directly (there are workarounds by using a HTML5 background
canvas and 2 videos)

And for video - VP9, webm video does have alpha channel support , 8 or 10bit
per channel , and is  supported by modern browsers, no licensing issues

But some users have restrictions set to disable embeded videos in browser
locally, or some websites might have restrictions on file types (e.g. some
forums)

An alternative modern animated image format, that has fairly wide support is
animated webp (not limited to 256 colors, supports alpha, has an RGBA
variant, and supported by modern browsers) . But gif is still the most
widely supported animated image format




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