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  1. #1
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    Question Ware exactly does Fcat sits in the chain?

    Hello Guys,
    in the Articles & Videos ) of Observed Frame Rating,
    but still not sure where in the chain the Nvidia Fcat software sits?

    and if you could elaborate abit it would be appreciate.




    Thanks.
    Last edited by Panta; 04-06-2013 at 01:56 AM. Reason: new information & rephrasing my question

  2. #2
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    Re: Ware exactly does Fcat sits in the chain?

    Good question, and you are right that Ryan's explanation is a little murky. As best as I can see, the answer is: T_display. As far as I can tell, his system measures the actual frame-rate displayed by the monitor. Or, more accurately, the frame rate sent to the monitor by the GFX card. The difference is down to the fact that most LCDs are locked at maximum of 60Hz. He is pointing out that this rate is different to the rate measured earlier in the chain by FRAPS.

  3. #3
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    Re: Ware exactly does Fcat sits in the chain?

    Quote Originally Posted by Panta View Post
    Hello Guys,
    in the Articles & Videos ) of Observed Frame Rating,
    but still not sure where in the chain the Nvidia Fcat software sits?

    and if you could elaborate abit it would be appreciate.




    Thanks.


    Are you asking specifically about the capturing or the overlay itself ?


  4. #4
    Joined
    Mar 2013
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    Re: Ware exactly does Fcat sits in the chain?

    Quote Originally Posted by mmettin View Post
    Are you asking specifically about the capturing or the overlay itself ?
    I'm trying to understand how exactly it works.

    at first i thought it was an overlay put on the captured video, which made no seance.
    because how can an overlay interpret the difference of farms on a video.

    Since this post i've re-read the article
    and understand now that Fcat does sits somewhere near fraps (on a software level)
    as stated in the article.
    "NVIDIA was responsible for developing the color overlay that sits between the game and DirectX
    (in the same location of the pipeline as FRAPS essentially)"


    so that makes me wonder, is if it sits in the same place ("essentially")
    1. how can there be a noticeable measurable gap between fraps & Fcat?

    2. i understand now that fcat sits near fraps and resides in the software level,
    which confuse me, since how it can be driver/gpu blind in that case?
    (beside the question of what is the gap between FRAPS & Fcat)

    3. Is the role of the captured video in the scheme of things is just to eliminate
    stress on the GPU that would report invalid data in the measuring process, due to the stress of capturing
    which im sure now is the case.

    It's all Very confusing & not easy to wrap your brain around
    unlless your a very technically person that's into GPU's interworks.
    (i do tray to understand more.)

    If Ryan would remake the technical diagram adding fcat position and the gap between it & FRAPS
    and how Fcat actually does the overlay it would better help understand & digest this new method.

    Thank you.
    Last edited by Panta; 04-06-2013 at 08:49 PM.

  5. #5
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    Re: Ware exactly does Fcat sits in the chain?

    Quote Originally Posted by Panta View Post

    1. how can there be a noticeable measurable gap between fraps & Fcat?
    As I understand it....Fcat just "draws" the colors on the screen, the "capture box" records the output of the video card. Ryan then analyzes the colors and interprets "runt" & Dropped frames

    Quote Originally Posted by Panta View Post
    2. i understand now that fcat sits near fraps and resides in the software level,
    which confuse me, since how it can be driver/gpu blind in that case?
    (beside the question of what is the gap between FRAPS & Fcat)
    See the answer to question 1

    Quote Originally Posted by Panta View Post
    3. Is the role of the captured video in the scheme of things is just to eliminate
    stress on the GPU that would report invalid data in the measuring process, due to the stress of capturing
    which im sure now is the case.
    The capturing happens on another box; think of the "capturing" as another mirrored display


  6. #6
    Joined
    Mar 2013
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    Re: Ware exactly does Fcat sits in the chain?

    guys, i truly enjoy pcper & respect the awesome tough work time & money invested
    to reveal this information, and i can see your integrity.

    my issue is,
    if i can (and did) explain an 80 year old woman
    the first time on a computer on an OS in a language she cannot read
    to the internet in early days of ADSL but just by using icons...

    i should understand how perceived frame rating process actually works,
    and should have figured it by now after reading/viewing all.

    i doubt im the only one that don't get the method in it's full scope.
    but if i cant understand it, you should consider making a new diagram or new way explaining this.

    with much respect.
    Panta
    Last edited by Panta; 04-12-2013 at 09:57 PM.

  7. #7
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    Florence, KY, USA
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    5,143

    Re: Ware exactly does Fcat sits in the chain?

    Fair enough, but the answer mmettin gave above is correct. The overlay is a local piece of software on the system being benchmarked that inserts colors at the same point as FRAPS would insert its overlay. The capture hardware is another separate system that records the output in real time, at full resolution. Then we analyze that.
    Ryan Shrout
    Owner, PC Perspective
    rshrout -at- pcper -dot- com
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