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+From y4msclaer(1):
+
+y4mscaler is a general-purpose video scaler which operates on YUV4MPEG2 
+streams, as produced and consumed by the MJPEGtools such as lav2yuv and 
+mpeg2enc(1).
+
+y4mscaler is meant to be used in a pipeline. Thus, input is from stdin, and 
+output is to stdout. The essential function of y4mscaler is to scale a 
+specified "active" region of the input stream (the source) into a specified 
+active region of the output stream (the target). Pixels outside of the active 
+region of the source are ignored; pixels outside of the active region of 
+the target are filled with a background color. The source may additionally 
+have a matte applied to it; pixels outside the source matte are set to a 
+separately specified background color.
+
+y4mscaler correctly handles chroma sampling, and thus it can also perform 
+chroma subsampling conversions. The YUV4MPEG2 stream format currently only 
+supports 4:2:0 subsampling, although y4mscaler can process 4:1:1, 4:2:2, and 
+4:4:4 modes by abusing the YUV4MPEG2 format a bit. 
+
+Includes preset parameters for popular output streams: DVD, SVCD, VCD,  DV, 
+CVD, and SVCD/VCD still images.
+
+WWW: http://www.mir.com/DMG/y4mscaler.html