Many music artists have Music Video Compilation DVDs. Since most DVD Soundtracks have a PCM Stereo stream which is 48kHz/16bit and CD's are 44kHz/16bit, would it not be true then that you will get a slightly higher quality audio file if you demuxed a Video DVD, extracting the PCM Stereo stream to a WAV file versus ripping the WAV file from the same song off the audio CD?

For example, Janet Jackson Design of a Decade. I have it on DVD. Is there any advantage to buying and ripping the CD if I can just already extract the soundtracks from the DVD? (Granted if I convert to high quality MP3 I'll have to manually enter the ID3 tags versus using some sort of ripping program that accesses the CDDB database and fills out the ID3 tags for you.)

Question: can you hear a difference?

There're many people claims to hear the differences.

Personally, converting using 48khz source to MP3 does have its advantages, espeacially it helps on pre-echo and micro-attacks.

The only draw back is the high frequency cut-off will be the same.
In thoery, 48khz will have frequency >20khz which most MP3 already cut-off.

Quality depends on the mastering process more than it does on absolute frequency cutoff (in this case). A listening test is the best way to determine if the DVD audio is any better.

Quality depends on the mastering process more than it does on absolute frequency cutoff (in this case). A listening test is the best way to determine if the DVD audio is any better.

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My previous post are mostly on encoding LPCM stream to MP3. Which doesn't have anything to do with mastering

Regarding mastering, there're many debates on this issues because different track is mastered differently. I've read articles about some movies DTS & DD audio track is masterred differently.
Saving Private Ryan is one of those.

I'm not sure about Music DVD but then again this is entirely depend on mastering process.