Microsoft Video 1 Microsoft Video 1 or MS-CRAM is an early lossy video compression and decompression algorithm that was released with version 1 .0 of Microsoft's Video for Windows in November 1992 . It is based on MotiVE, a vector quantization codec which Microsoft licensed from Media Vision . In 1993, Media Vision marketed the Pro Movie Spectrum, an ISA board that captured video in both raw and MSV1 formats.Compression algorithm Microsoft Video 1 operates either in a 8-bit palettized color space or in a 15-bit RGB color space . Each frame is split into 4×4 pixel blocks. Each 4×4 pixel block can be coded in one of three modes: skip, 2-color or 8-color. In skip mode, the content from the previous frame is copied to the current frame in a conditional replenishment fashion. In 2-color mode, two colors per 4×4 block are transmitted, and 1 bit per pixel is used to select between the two colors. In 8-color mode, the same scheme applies with 2 colors per 2×2 block. This can be interpreted as a 2-color palette which is locally adapted on either a 4×4 block basis or a 2×2 block basis. Interpreted as vector quantization , vectors with components red, green, and blue are quantized using a forward adaptive codebook with two entries.Use in NetShow Encoder The codec was available in Microsoft NetShow Encoder, which was later renamed Windows Media Encoder , and made available via the SDK. The NetShow encoder allowed the user to select a 2 pass option, where in the first pass the video was analyzed to create a color palette , and in the second pass converted to the palettized color space and encoded. Before encoding, the video could be scaled . Later versions of Windows Media Encoder dropped support for Microsoft Video 1 and only supported Windows Media Video .
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