Codecs are algorithms for compressing files, if you don't compress files they just take so much space, for example a jpeg picture of 1 MB would take about 22 MB space if left uncompressed. Or think about a music CD where it will only take about 12-13 songs uncompressed but will hold about 200 mp3's.
Did you try ripping the music with roxio itself ? does it play on roxio if you rip with roxio, if it still doesn't your roxio installation might be botched. try downloading the latest updates from roxio, or uninstall roxio and re-install
I can burn both DVDs and SVCDs (super video CD), they will play on many DVD players
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