I have a DVD main movie (MPEG-2, 720x576, PAL 16:9 ; one audio stream Dolby digital, 48000Hz, 6ch) that I need to compress a bit (about 7-10%) so as to fit on a single DVD-5. Also, I found (on previous non compressed short movies) that normalizing the audio stream gave much better results on my DVD player and 2 speakers (if not normalizing, I must continually change the volume while movy is playing) . Now I wonder if I must first compress the movie (I use Nero Recode 2 or DVD Shrink 22.214.171.124 for that) and then normalize the resulting Dolby audio stream (I use TMPGEnc MPEG Editor 126.96.36.199) or the opposite. Usually normalizing to 90% is ok (any help in this field will also be greatly appreciated since I don't understand what represents 90% and why it also increases the overall volume level).
Thanks for your advice