Of course we can't guarantee complete compliance with the standard. To choose a file format for the decoded pictures. The luminance component is stored with an extension of .Y, the chrominance components are stored as .U and .V respectively. All components are stored in row storage from top left to bottom right. This format is also known as Abekas or CCIR Rec.
Extension is .ppm.
The current version supports only 8 bit color display. The output routines perform 8 bit dithering and interlaced to progressive scan conversion. The -f option permits to store both fields of a frame into one file. The -r option selects a double precision inverse DCT which is primarily useful for comparing results from different decoders. Set this switch to suppress output of warnings to stderr.