fixup filename in error message, fix nasty problem with really huge skip values where encoder was unable to handle multiple huge skip values for both 16 and 32 bpp modes, use MV_MAX_32_BITS constant as needed
add check on upper bounds of framebuffer size that can be stored in the 24 bit frame size, larger than 24 bits is so massive that it is unlikely one would ever make a movie that large to run on an ipad