Amlogic video support is now "as good as it gets" until the next wave of VideoPlayer changes land in Kodi v18. We might see some tinkering around the edges if small changes backport easily, but nothing substantial. The developer in question has already stated he does not support attempts to backport larger 'agile' changes to Krypton and we will not add things that are not upstream supported.
NB: Raspberry Pi does not use "amcodec" within Kodi so even if it does play VC-1 nicely the comparison is (on a technical level) irrelevant ![]()