Pixilation Problems persist to be present when profile is 2-pass export

I recently finished a movie export from Nero Video and noticed that whenever I did a 2-pass export there were a few scenes that pixilated when rendered to a BDMV file, yet there was no pixilation during a 1-pass export.
It is as though the second pass gives conflicting information to the encoding and the program tries to decide which pass is right, ending in a pixilated compromise.
Has anyone else experienced this?
Seems like a program error to me.

 

The only way there would be a degrading of video quality from one pass to two pass is if there different settings for each. It sounds like a bitrate reduction

Are all the settings the same for both 1 and 2 pass? The level of compression and lowered bitrate can cause pixelation.

 

my understanding is that once you set the settings, both passes will be done the same ?
the only thing i changed in settings was switching from 1-pass to 2

 

There has to be something that differentiates the two outcomes, and going from 1 pass to 2 pass isn't the most likely answer. In a 2 pass encode the first is used to analyze and improve bitrate allocation and file size. This makes the 2nd pass more effective at producing better video quality, not degrade it. So either Nero's coding is seriously flawed, or the settings you used for your 1 pass encode differs somehow from those you used for your 2 pass encode.

 

Absolutely Definitely coding flaw.
Everything else Identical.
There are 7 videos in my project, this only happens on 1 of them, also the exported file size is different, again only on the one file

 

I apologize for not going back and looking at your Nero burn log file but, if I remember correctly, your files are mpeg with a fairly low resolution of probably 720x and you were using a huge custom bit rate of about 40000 kb/sec. Seemed to be another factor I saw but can't remember. What is the resolution of the problem file?

 

all files used in Nero Video project are 32 bitrate Mp4s , 1920x1080, h264, export settings write to a BDMV also in h264, 33 bitrate.

 

I suggest either using 1-pass or asking tech support. The 2-pass uses a variable bit rate and I don't know what it's doing for that particular file.