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How much better is VBR 2 Pass than VBR 1 Pass or CBR?

Hi,

 

I had a 2 hour and 40 minute wedding on a Premiere Pro CS 5.5 Timeline. (I exported it as a QT Reference File from Final Cut Pro 7)

 

I added my Encore Chapter markers in PPro and went File ----- Export ---- Media.

 

Media Encoder opened and I set my settings the following way:

 

H.264 Blu-Ray

1440 x 1080 29.97 FPS

PCM Audio

Target Bit Rat = 18.5

Max Bit Rate 20

VBR 2 Pass

 

When it first started encoding it said that it was going to take 8 hours.

It has taken 14 Hours and it's finally finished.

 

My question is,

 

How much better is VBR 2 Pass than VBR 1 Pass or CBR?

 

The first pass of this job took about 3 and a half hours. The last 11 hours was the full 2 Pass.

 

Would VBR 1 Pass or CBR give a good enough quality as an H.264 Blu-Ray to give to clients.

 

Thanks in advance

 

Premiere Pro CS 5.5

Media Encoder 5.5

Encore 5

 

Mac Pro

10 GB RAM

2.66 GHZ Quad-Core Intel Xeon


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