At which output? DVD players are schizophrenic -- they follow the ITU spec at the analog outputs, the MPEG 2 spec at the upscaled HDMI output.
Usually the correct way to handle an ITU capture is to crop 8 pixels of the left, crop 8 pixels off the right (or an unequal amount for a total of 16 pixels) and encode as 4:3 DAR or 10:11 SAR (4:3 NTSC) 12:11 SAR (4:3 PAL). Some people prefer to resize to a 4:3 frame size and encode square pixel.