Decompression

[JacquesLab]

I acquired commercial copies of operas on DVD that are over-compressed and video and audio quality is poor. How can I decompress a DVD of say 2.19GB (probably more than 50% compression), to a more acceptable 4GB and 70%+ compression? When using DVDShrink myself, I either re-author a recording of 140+ minutes, or burn to a dual layer disc.

• 
  

[jagabo]

All you're going to do is replace blocky artifacts with smooth, greasy looking gradients. You won't get any detail back. It will require decomrpessing, running a deblocking filter, then recompressing the video at a higher bitrate.

[aedipuss]

you'd have to buy the original master video source from before it was encoded to poor quality dvd to make it any better. you can't magically make up better quality from nothing.