My philips DVP- 642 is a picky player with mpeg4 discs. It will only consistently read mp4 discs burned at 4x on my 1620. Discs at 8x and 12x read about 50% of the time. 2.4x just can’t be read at all. Nero disc quality test results show low pie\pif for 4x ,8x with overall quality at 97. 2.4x and 12x quality 95.
According to nero these should all be good burns. So what is the missing ingredient that nero does not show that my burner is looking for.
media is maxell +r 8x, but I get similar results with yuden and others.
DVD video burns seem to read well at all recording speeds.