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Re: Blu Ray replication for Independent Feature

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Rafael Amador
Re: Blu Ray replication for Independent Feature
on Feb 1, 2012 at 7:02:38 pm

These maths are not much difficult.
You have 25GBs disk, so 25.000MB available.
Then you have a 90 minutes movie, so (90x60) 5.400 seconds of movie.
You divide the memory by the time and you get how many MB you can assign to each second.
That is 25.000/5.400 = 4.629MB/s.
Then you know that 1Byte = 8 Bits, so 4,269MB/s = 37.037Mb/s

So you could set a data rate of some 37Mbps (37.000Kbps).
This is for video and audio, so if you allows good audio quality you discount some data rate from that (up to the quality you want).
You must have in to account as well that 25GBs BR disks don't have really 25 GBs (50GBs BR disks have less than 47).
So I you could try with a data rate of some 30/35Mbps for the 90 minutes H264.
That's the preset data rate in Compressor for BR.
Duplicate any H264 preset, and in "File Format" chose BR.
Export with the values you'll get ther and bring the H264 to Toast (you need a Toast plugin for BR).
Don't let Toast recompress.

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