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How To Tell CBR vs VBR

Discussion in 'DivX / XviD' started by seagrave, Apr 5, 2010.

  1. seagrave

    seagrave Regular member

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    I get some MPEG4 downloads that given their size probably should not show macroblocks. I've wondered if there's a way to tell whether the encoder used single pass CBR or multi-pass VBR. I might be missing something, but I can't find anything in GSpot that that says whether a video is CBR or VBR.

    How can I tell? If not GSpot what?

    Thanks!!
     
  2. seagrave

    seagrave Regular member

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    Just tried MediaInfo... and I still can't see anything that displays this info.
     
  3. cyprusrom

    cyprusrom Active member

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    Switch to "Text View" in MediaInfo, you will get more information:
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    [​IMG]
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    Some files are not listed with "Variable Bitrate", but instead with a "Bitrate" and "Nominal Bitrate", which indicates VBR.
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    [​IMG]
     
  4. seagrave

    seagrave Regular member

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    Thanks AGAIN cyprusrom!!

    So if there's just one listing, say

    Bit rate : 1368 Kbps

    We know it's a single pass?

    Can "nominal" also indicate ABR (Average Bitrate)? I assume that would still take more than one pass.
     

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