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Diferent file sizes, same image quality ¡¡

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alberto ferrigno
Diferent file sizes, same image quality ¡¡
on Nov 16, 2015 at 2:52:18 am

Am new to MC6, so please excuse my ignorance,

I decided to run some tests, i exported a 1 minute sequence as a QT movie using different codecs and this what i got:

CODEC SIZE

Avid codec : 1.19 GB
Animation codec: 10 GB
Avid DN x HD codec: 1.02 GB
H.264 codec: 0.716 GB
No compressor codec: 13.9 GB
Avid 1:1x codec: 1.21 GB

And all the exported QT movies look the same at least to the naked eye, can someone explains to me whatis going on ?


Thanks.


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Michael Phillips
Re: Diferent file sizes, same image quality ¡¡
on Nov 16, 2015 at 8:22:50 pm

Other than uncompressed, codecs have a data rate associated with them. And based on that data rate, the resulting file will have a different size assuming everything else about the file is the same.

From your list:

Avid codec: which one?
Avid DNxHD codec: which one? 36, 80, 145, 220, 440, etc.?
H.264 codec: not knowing the other data rates, nor the data rate of this one, it will be the most compressed as it is a longGOP format and not I frame.

As far the differences between the different "uncompressed", it is hard to tell the reason there. What was the size and frame rate of original file?


Michael


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