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Thread: Spectral Display

  1. #1
    Brad Markisohn Guest

    Spectral Display

    Is there a control to spectrally display of an AVI file while it's being
    played? I've quickly looked in DirectX 7 with little success. Any help
    would be appreciated.

    Brad Markisiohn



  2. #2
    Ray Mercer Guest

    Re: Spectral Display


    "Brad Markisohn" <dbmarkisohn@INDesign-LLC.com> wrote in message
    news:39452b02$1@news.devx.com...
    > Is there a control to spectrally display of an AVI file while it's being
    > played? I've quickly looked in DirectX 7 with little success. Any help
    > would be appreciated.


    AVI files normally contain a video stream. Are you wanting to display the
    video spectrally or the audio?

    I've never seen video displayed "spectrally". How does it work?

    Ray Mercer
    www.shrinkwrapvb.com



  3. #3
    Mike D Sutton Guest

    Re: Spectral Display

    > I've never seen video displayed "spectrally". How does it work?

    From memory Real Player G2 has a spectral view of the audio in real
    audio/video files. It looks strange, like a scrolling bar of noise
    (Graphical noise rather than audio noise) really, where the louder parts
    produce spikes on the graph. Kind of difficult to explain.
    Hope this rather vague explanation helped hehe

    Mike



  4. #4
    Ray Mercer Guest

    Re: Spectral Display

    Thanks, but how does that answer my question about *video*???

    Or are you saying that he is asking for a control to display a spectral
    analysis of audio streams? I kind of thought as much, but was waiting for
    the *poster* to clarify so that he might get a response...

    Ray

    "Mike D Sutton" <Frankle@btinternet.com> wrote in message
    news:39462528@news.devx.com...
    > > I've never seen video displayed "spectrally". How does it work?

    >
    > From memory Real Player G2 has a spectral view of the audio in real
    > audio/video files. It looks strange, like a scrolling bar of noise
    > (Graphical noise rather than audio noise) really, where the louder parts
    > produce spikes on the graph. Kind of difficult to explain.
    > Hope this rather vague explanation helped hehe
    >
    > Mike
    >
    >




  5. #5
    Mike D Sutton Guest

    Re: Spectral Display

    > Thanks, but how does that answer my question about *video*???
    >
    > Or are you saying that he is asking for a control to display a spectral
    > analysis of audio streams? I kind of thought as much, but was waiting for
    > the *poster* to clarify so that he might get a response...


    You said you didn't know what a spectral display was, I was trying to offer
    a description. What I think he's trying to do is draw a spectral view of
    the audio, I've never heard of a video being displayed spectrally...
    Sorry for trying to help,

    Mike



  6. #6
    Ray Mercer Guest

    Re: Spectral Display

    Hi Mike,

    LOL!
    No need to get defensive ;-)

    > You said you didn't know what a spectral display was,


    Actually, if you take the time to re-read my posts, you will see that I
    never said that. The first time I saw a spectral analysis was when a band
    (was either Silverwind or Sweet Comfort Band) was setting up in my church
    about 15-20 years ago. They flooded the room with white noise and used a
    spectral device to pre-EQ the house mix before the band started warming up.
    Of course I also have CoolEdit and WinAmp installed on this notebook, both
    of which have a spectral analysis feature.

    > I was trying to offer
    > a description. What I think he's trying to do is draw a spectral view of
    > the audio, I've never heard of a video being displayed spectrally...


    I was wondering whether there was some tecnique for analysing video that I
    had never heard of, and that was what the poster was referring to. Of
    course it could not actually be a spectral analysis unless it were only
    luminance or maybe one color at a time... Anyway, the poster already
    emailed me and said he meant wave files not avi files. Unfortunately, I
    don't have any sample code or controls to offer which would help him with
    his original (intended) question ;-(

    > Sorry for trying to help,


    Please don't assume that I was trying to put you down. I appreciate your
    willingness to jump in. I was just trying to get a reply from the poster
    (which I eventually did).

    Ray





  7. #7
    Mike D Sutton Guest

    Re: Spectral Display

    > Actually, if you take the time to re-read my posts, you will see that I
    > never said that.


    That was just how I interpreted what you said, I apologise.

    > Of course I also have CoolEdit and WinAmp installed on this notebook, both
    > of which have a spectral analysis feature.


    WinAmp has a spectral analysis feature? A plugin or built in?

    > I was wondering whether there was some tecnique for analysing video that I
    > had never heard of, and that was what the poster was referring to. Of
    > course it could not actually be a spectral analysis unless it were only
    > luminance or maybe one color at a time...


    I had a go at analysing each of the channels of an image using a kind of
    spectral analysis when I was working on my dithering code but as far as I
    know there's no spectral analysis for 2D datasets.

    > Please don't assume that I was trying to put you down. I appreciate your
    > willingness to jump in. I was just trying to get a reply from the poster
    > (which I eventually did).


    np, again I misinterpreted you -- sorry.

    Mike



  8. #8
    Ray Mercer Guest

    Re: Spectral Display


    Hi Mike,
    > WinAmp has a spectral analysis feature? A plugin or built in?


    Both.
    Here is a full-screen spectrum analyzer plug-in:
    http://ftp.winamp.com/components/P/VisSatan.exe

    and if you DL WinAmp 2.64 - which is the latest version I think - you can go
    to options|preferences and choose "Spectrum analyzer / Winshade VU" as the
    default visualization mode.

    CoolEdit
    www.syntrillium.com
    has a real good spectral analysis view of the entire wave file too (not just
    realtime peaks).

    > > Please don't assume that I was trying to put you down. I appreciate

    your
    > > willingness to jump in. I was just trying to get a reply from the

    poster
    > > (which I eventually did).

    >
    > np, again I misinterpreted you -- sorry.


    Apology accepted. No prob.

    Ray



  9. #9
    Mike D Sutton Guest

    Re: Spectral Display

    > Both.
    > Here is a full-screen spectrum analyzer plug-in:
    > http://ftp.winamp.com/components/P/VisSatan.exe
    >
    > and if you DL WinAmp 2.64 - which is the latest version I think - you can

    go
    > to options|preferences and choose "Spectrum analyzer / Winshade VU" as the
    > default visualization mode.


    Oh, I knew about that one, and the satan vis is good too. In the old
    version of winamp there was one that was called a spectral analysis plugin
    which draw a strange scrolling noise based in the spectral information. It
    dissapeared after version 1.8 or so though. I tried looking for it on the
    WinAmp site but to no avail so I think they just scrapped it.

    > CoolEdit
    > www.syntrillium.com
    > has a real good spectral analysis view of the entire wave file too (not

    just
    > realtime peaks).


    I used to have a demo of cool edit, but only an old version, I may try
    looking at it again.

    > Apology accepted. No prob.


    Thank you

    Mike



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