(for ACE to be one frame in hardware video overlay)
You will need a more powerful processor if you disable the hardware video overlay (not a good choice!).
BRexx and iff_catalog are available at HaikuDepot and in the HaikuDepot application bundled with Haiku. To install them using the command line on 32-bit systems:
pkgman install iff_catalog_x86 brexx_x86 fresample_x86
On a 64-bit system:
pkgman install iff_catalog brexx fresample