Rbaggio,

Sorry for me to reply in English. So how about you just use DVDit to build directly:

(1) If DVDit's "Build" can accept your 5.2GB, then adjust bit rate lower
to be 5M/s in "Video Setting" since DVDit will again MUX/De-MUX your
mpeg2 file before actually build. Since I use MP5120A DVD+RW, usually
I use "Build Disc" directly. If you use DVD-R, it's better to "Build Volumn"
first, then use Nero to burn the disc. Two tips for your information:

(a) Only drag VIDEO_TS. I think it's a tiny bug within Nero which
always put AUDIO_TS before VIDEO_TS in DVD structure. Then my
Pioneer DV-533K suppose it's a DVD-Audio and then hangs over there.
Some guys in Doom9 forum overcome same problem by shifting to
RecordNow Max or Instant CD/DVD. But it seems now most burning
software's price is higher and higher, and I'm used to Nero. Therefore
I tried to only drag the VIDEO_TS, and it WORKS!!!

(b) Within DVD UDF/ISO, the ISO settings are Level 1, ISO 9660
Character Set, NO joilet, and NO any option in Relax ISO Restrictions;
and use Nero defaults in UDF settings: Physical Partion and ver 1.02.

(2) If DVDit's "Build" doesn't accept your 5.2GB file, I think you have to
re-encode it via TMPGenc with a lower bit rate, e.g. 5 or 5.5M/s. Don't forget "GOP closed" in "GOP Structure." But I'm curious what damn is your mpeg2 file let you to choose 6.5M/s bit rate. Most DVD movies use
4M/s. Even to some "fast-motion" movies, the bit rate is only up to 6M/s. Under kinda MPEG2 destructive compression, I don't think you can
have any gain in film quality with a higher bit rate if your source is DV, TV, or even DVD-Video.