Is animation the only codec with alpha channel?

[Annaël Beauchemin]

but be warned of the gamma shift issue with PNGs…

[Guy]

You could try the animation codec set to 99%

[Andreas Wittenstein]

SheerVideo is not a reduced-quality codec. Whether you’re dealing with 10-bit or 8-bit channels, RGB[A] or Y’CbCr[A], 4:4:4[:4] or 4:2:2[:4], SheerVideo will reproduce your video perfectly, bit-for-bit identical to the original. With Microcosm and PNG, that’s only true for RGB[A], since neither of them support Y’CbCr. And for the Animation codec, it’s only true for 8-bit RGB.

Note also that SheerVideo does HD in real time, whereas Microcosm and PNG are way too slow even for real-time SD. Animation is great for traditional constant-shaded 2D animation, but doesn’t really shrink file sizes for real-world video at all.

Andreas Wittenstein
BitJazz Inc.
https://www.bitjazz.com/sheervideo/