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MEncoder can create MPEG (MPEG-PS) format output files. Usually, when you are using MPEG-1 or MPEG-2 video, it is because you are encoding for a constrained format such as SVCD, VCD, or DVD. The specific requirements for these formats are explained in the VCD and DVD creation guide section.
To change MEncoder's output file format, use the -of mpeg option.
Example:
mencoderinput.avi-of mpeg -ovc lavc -lavcopts vcodec=mpeg1video -oac copyother_options-ooutput.mpg
Creating an MPEG-1 file suitable to be played on systems with minimal multimedia support, such as default Windows installs:
mencoderinput.avi-of mpeg -mpegopts format=mpeg1:tsaf:muxrate=2000 -ooutput.mpg-oac lavc -ovc lavc \ -lavcopts acodec=mp2:abitrate=224:vcodec=mpeg1video:vbitrate=1152:keyint=15:mbd=2:aspect=4/3
If for some reason the video quality of the second pass did not satisfy you, you may re-run your video encode with a different target bitrate, provided that you saved the statistics file of the previous pass. This is possible because the statistics file's primary goal is to record the complexity of each frame, which doesn't depend heavily on bitrate. You should note, though, that you'll get the best results if all passes are run with target bitrates that do not differ very much.