EXAMPLES:1. to decode a bitstream with double precision IDCT, such as    to create a reference reconstruction set of frames:    mpeg2decode -r -f -o0 rec%d  -b bitstream.mpg2. to decode a bitstream with fast integer IDCT, such as    to create a test reconstruction set of frames:    mpeg2decode -f -o0 rec%d -b bitstream.mpg 3. To substitute reference pictures with external reference    pictures (ref%d):    mpeg2decode -f -x ref%d -b bitstream.mpg -o0 rec%d4. Same as 3. only using a single large concatenated file for the   sequence of reconstruction frames.    mpeg2decode -f -g -x ref%d bitstream.mpg -o0 rec%d5. Decode an SNR enhancement bitstream at the same time as base layer   stream:    mpeg2decode -o0 rec%d -e snr_bitstream.mpg -b base_bitstream.mpg 6. Decode a Spatially scalable bitstream   Step 1: create lower layer reconstruction     mpeg2decode -f -o0 llrec%d -b base_layer.mpg   Step 2: decode enhancement bitstream, combined reconstruction.     mpeg2decode -f -l llrec%d -b enhancement_layer.mpg -o0 rec%d------------     where:      -o0             specifies .Y, .U, .V input      -f              specifies field interleaved format      -b              is the bitstream flag      -g              specifies substitute file is a large concatendated one.      -e              substitution flag      ref.pic         filename of substitution sequence      bitstream.mpg   bitstream      test%d          output file pattern