ReFrames, GOP

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2014-03-31
2014-04-02
  • Chris Markle
    Chris Markle
    2014-03-31

    Find the MediaInfo tool very useful (got it from the AppStore). I have an original video shot with the iPhone 5s camera showing ReFrames = "1 frame" and GOP = "M=1, N=30". Then our app uses AV Foundation and encodes that, supposedly just changing the bit rate (which works). When I look at the encoded result it shows ReFrames = "2 frames" and doesn't have any GOP information.

    • What are these keys telling me: ReFrames; GOP?
    • Any thought about why the encoding of the original might be lacking the GOP data?

    Thanks in advance.

    Chris

     
  • Find the MediaInfo tool very useful

    :)

    ReFrames;

    Count of maximal reference frames.

    GOP

    Group of pictures

    Any thought about why the encoding of the original might be lacking the GOP data?

    Your file has variable GOP size. Classic with non real time encoding (quality optimization for the same final file size)

     
    Last edit: Jerome Martinez 2014-04-02