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Thread: TMPGEnc MPEG Editor and file size problem

  1. #1
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    Default TMPGEnc MPEG Editor and file size problem

    Have just bought TMPGEnc MPEG Editor (Its no longer free!) and have cut sections from a 1hr 53 min long MPEG2 video clip (1,779,089 KB),making it exactly 1hr long. When I come to save the shortened clip as a 'Common MPEG' file it fails with the message insufficient disk free space available, 6.53 GB free space needed. I am saving to a partition with 3.83 GB of free space so clearly it is not enought. But can anyone explain why such a comparatively short video clip requires such a lot of free space to be saved?

  2. #2
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    Well, here's my theory on this.

    In basic terms, MPEG2 uses delta information between two key frames and these are not full frames. So, in essence you will have a key frame (I-frame) which will be a full frame with all the the image content and then you will have intermediate frames (P and B frames) which in themselves do not contain all the image data but just information on what's changed (this is very high-level btw).

    When you go to transcode this to standard MPEG, then all those intermediate frames become full frames again. I believe this is why the file size increases.

    Alternatively I could be talking complete and utter twaddle.
    Lloyd

    That's my opinion. If you don't like it I have others

    System: Apple Macbook Pro 17, and an external Freecom 500GB eSATA drive.
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  3. #3
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    Depends on the above and the comparative bitrates. As Lloyd says, file sizes of MPEG2 video will vary according to the variables used in the encoding process. I would suggest that you use a bitrate calculator to get the right size of video for any given length.

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