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Does your calculation account for audio? Premiere's estimate may be based on uncompressed PCM (1536Kb/s) and Encore will probably default to Dolby Digital (192Kb/s).
Premiere is doing the calculating.
It should be calculating based on the current settings which is PCM for audio. Premiere is adding the audio and video to come up with an estimate.
The estimation is generated by Premiere based on the encode settings like target mbps. The result is Premiere spits out two files:
.m2v = video
.wav = audio
I expect the total of those two to be in the ballpark of the estimate. However, the the estimate is consistantly high.
Another example from last night:
Premiere Estimated = 5884MB
Actual = 4721MB
My workaround is to decide what my target size is . . . usually about 4.6GB for plain old DVD and multiply it by a correction factor:
4.6GB x 1024 x 125% = 5884
I just find it odd that I would have to apply a correction factor.
I found 2.0 also estimated high, thus forcing the user to select a lower bitrate than would have actually fit.
I find this problem very frustrating. Switching from Adobe Premiere Elements to Premiere Pro CS3 has been very painful and functions that I took for granted such as accurately setting the maximum video bit rate to fill a DVD no longer work.
My question is how did you increase the file size beyond the single sided DVD default size? I had to select dual layer DVD and I'm hoping that I don't introduce any side effects by doing this.
Does anyone know for sure if Encore is converting the audio from PCM to another format? I noticed in Premiere that you can select PCM or MPEG as the audio output type, and in Encore you can set the audio transcoding in the project settings to either PCM, MPEG 1 Layer 2, or Dolby Digital.
I would really like to know why the shrinking occurs.
Why not use a bit rate calculator if you don't want Encore to do this for you?