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Thread: Sequence Preview

  1. #1
    Join Date
    May 2007
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    Default Sequence Preview

    I've not seen this discussed before,
    so,
    It appears the Sequence Preview stores the picture in the vix file it self.
    so the larger the picture, the larger the file.
    And it does affect the performance,
    especially with a large detailed picture,
    the preview can't keep up.
    Now this is with a low end machine with limited memory.
    When i use the development computer it doesn't seem to mater,
    bu the slower / less memory operational unit is affected.
    By compressing the picture and reducing it's size,
    fixed the problem.
    I didn't try to see if it affected the actual display performance,
    but I thought this could be a useful topic to discuss.

  2. #2
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    I tried to run Vixen on a slow computer last year and found that the picture didn’t slow down Vixen, but instead delayed the preview until the picture was fully drawn; this includes the time to get it off the harddrive. After that the speed was determined by the number of pixels that were changed. On a desktop, you might be able to change the graphics card to a faster one.

    I saw this same problem on a 1GHz notebook when Vixen was run from a USB dongle.

    The video delay does have an affect on the show though it didn’t seem to follow exactly. It looked like Vixen was still trying to keep time with the music but the outputs lagged a bit; kind of like running through deep water.

    Edit:
    You might be able to still use the computer as a show system by turning the preview off.
    [I]A mediocre person tells. A good person explains. A superior person demonstrates. A great person inspires others to see for themselves.[/I]

    <a href="#" onclick="return(showhide(this));">Click here to show/hide my display details ...</a>
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    var Y='block', N='none', det=anc.nextSibling; //<br />
    if (!det) det=document.getElementById('details'); det.style.display=(det.style.display!=N)?N:Y; return false;}</script><div id="details" style="display:none;"><br /><img src="http://www.vixenlights.com/sig/sig_h.php/128/All.gif" border="0" alt="" /></div><a href="#" onclick="return(showhide(this));">Click here to show/hide DIYC Links ...</a>
    <script language="javascript">function showhide(anc){ for(; ; ){ if(!anc.nextSibling) break; if(anc.nextSibling.nodeName == "DIV") break; anc = anc.nextSibling; }//<br />
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  3. #3
    Join Date
    May 2007
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    The preview is definitely going to be a drain. For each cell drawn in the preview, it has to determine all of the channels that are going to be on during that period and blend them together. That's not a lot of work, but it is when multiplied by however many cells are being drawn during that period, 10, 20, 50 times a second.

    This is something I would like to resolve, but just not yet.

  4. #4
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    I posted this as an observation,
    not a problem.
    I haven't tried running a show with the full preview running with a large picture,
    but Ernie says it only seems to slow down the preview not the output.
    That's great news.
    I'm running a 533m computer with 256m memory,
    but the video is the oem and I don't know the memory in that,
    but I did see the preview not keep up with the program.
    It was at first troubling,
    wondering if I had messed up the sequencing,
    but when I turned off the picture it was fine.
    Now I just heavily compress the picture and make it low resolution,
    and everything seems fine.

    I brought this up just to let others know of the issue,
    just like the comment a while back about using wav files instead of mp3 files are less of a burden on the computing needs.
    For those of us with older slower show computers.
    I generally develop the show on faster / bigger machines but my backup, and the one that I have currently that I'm willing to carry around and move is an older slower system.

    Thanks for all the help and advice.
    This is a great forum :D

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