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Nero2018 Recode

Please , does anybody have an explanation for the following:
Using Nero Video Export to get a specific video.mp4 file, the resulting video takes up 24 MB.
When I recode this .mp4 file with Nero Recode to get a Matroska or .mkv file, this .mkv file takes up 44MB.
If I use XMEDIA to recode the same Nero .mp4 file into a .mkv file the resulting .mkv file takes up only 6.6 MB. The resulting .mkv files have the same HD resolution as the original .mp4 resolution. How come?
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