Hi, Everyone,
I'm trying to import a video sequence as a plane (it works fine).
When i try to add an opacity video its gives me a codex error.
Need Help
27% of original size (was 1920x726) - Click to enlarge

Not all formats are recognized and in particular things with alpha channels need to be VERY specific formats for iClone (which is why I bought PopVideo to do conversions).

When you load in a Popvideo it automatically loads in both the diffuse and alpha channels.  Otherwise you can create an alpha with a grayscale image but, again, not all formats will work.  It's further complicated by the fact you can't rely upon the extension (formats like AVI for example are catchalls for a wide variety of codecs).  In general I've found iClone to be pretty picky about things which is why I finally gave up and got Popvideo.

If you list your format and what you used to produce it perhaps others can help you further.

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

May this post could helps you:

https://forum.reallusion.com/FindPost322216.aspx