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streckfus
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Encoding for Encore from Premiere Pro - File Size

Jun 21, 2013 6:05 AM

I'm working on a Blu-ray project that contains four separate tutorials, each with several individual clips.  I exported each clip (chapter) out of After Effects CS6 using the standard H264 preset.  The tutorials range from 2 to 5 hours each.  After all was said and done, the total file size of all H264 video clips was just under 25GB, perfect for a Blu-ray burn.

 

I created four sequences in Premiere Pro, one for each tutorial.  All of the H264 video files were brought into Premiere Pro, chapter markers were added, ready to rock.

 

When I attempted to export each sequence using the H264 Blu-ray preset, I found that using that preset would result in a grand total of about 75GB worth of data.  So I selected the MPEG2 Blu-ray preset, and it was almost the same.  I manually adjusted target bitrate settings, dropped quality to as low as it would go, and still the estimated file size far exceeded the 25GB I had available.

 

All tutorials total about 15 hours of 1280x720 30p content.  I realize that's a ton of data, but AE exported all of this content using H264 and the grand total file size was under 25GB.  But bringing those very same video clips into Premiere Pro, assembling them, and exporting them results in much, much larger files.  I even attempted to import the AE exports directly into Encore to avoid having to re-encode anything, and still it estimated that the project's file size exceeded 75GB, even though the source footage of H264 video was less than 25GB.

 

Right now I'm down-rezzing all of the footage to 720x480 and the file sizes are smaller, although I'll still need to decrease the bit rates significant if I have any shot of dumping all of this onto a single 25GB Blu-ray.

 

I do realize that 15 hours is a lot for a single disc, but what I don't understand is how I can have 15 hours of H264 exported out of AE result in less than 25GB, but using that exact same footage in PPro/Encore results in over 75GB of footage.

 

Any insight would be appreciated.

 

Windows 7 64-bit

Adobe Creative Suite Production Premium CS6

(After Effects/Premiere Pro/Encore)

 
Replies
  • Currently Being Moderated
    Jun 21, 2013 7:31 AM   in reply to streckfus

    File size is determined by only two things - bitrate and duration.  How many bits per second x how many seconds = total bits for the file.  Your AE exports clearly had significantly lower bitrates than the PP exports.  They were also not BD compliant, which means Encore had to transcode them, which means new files at new bitrates, and thus larger sizes.

     

    You may really be exceeding the limits here.  It would not be unwise to consider putting each tutorial on it's own separate disk, instead of all of them on one.

     
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