Welcome to the forum.
The first part of the quality loss is that the .VOB is encoded to a compressed format/CODEC MPEG 2. That is designed to be played, and not edited.
I try to insert to my movie vob file (decrypted from my DVD) wchich quality is really perfect
What are the exact steps that you performed to get the material from the DVD-Video, and into PrE? That can also be a source of the quality loss, but we need to know those exact steps to help here.
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Have you saved the VOBs ripped from your DVD-VIDEO and saved them to your computer hard drive and then are bringing them into Premiere Elements Get Media/Files and Folders? Or, are you following the recommended procedure of placing the DVD-VIDEO DVD disc in the DVD burner drive tray and using Premiere Elements Get Media/"DVD (Camcorder or PC DVD Drive") and the Media Downloader to do the job?
Either way, some people get excellent results. Others do not. For those do not, the remedy is converting the VOBs to DV AVI with the free download MPEG Streamclip
and then bring the DV AVI version into Premiere Elements via its Get Media/Files and Folders.
Have we determined that your Premiere Elements project preset (new project dialog) = NTSC DV Standard or Widescreen or the PAL counterpart? And, have we determined that you export will be as NTSC Standard or Widescreen or its PAL counterpart?
The answer is 99.99999999% in that MPEG Streamclip software conversion.
Thanks for info; yes, I save ripped VOB on my hard disk and then via Get Meddia/Files and Folders insert to PE7. I will try to convert as you suggest and see what will happened. Concerning two last questions, in both cases - preset and export is PAL counterpart
I decrypt, via DVDDecrypter, DVDvideo and then interesting VOB file, via Get Media/PC Files and Folders import to PE7. So, there is nothing I make "by the way"....