Question about DVD player — DVD Players — DVD MP3 AVI MP4 players codecs conversion help

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I picked up a Memorex MVD2042 DVD player for my mom the other year. I
burned some home movie footage onto a DVD-R for her and she has trouble
playing it back on this player. I did a little research online and didn't
see any where that it would play either + or - DVDs. Just curious if anyone
knows.... TIA

Jarrod