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Thread: 'X Position' fade jumpy

  1. #1

    'X Position' fade jumpy

    Hi there,
    Wondering if theres a quick fix here...

    I'm trying to slide video across stage to match a scenic automation but X position seems to be very low resolution and this results in a jerky motion.
    The movement is about 1/2 of the 1024x768 screen width, using an 8 sec timed fade from the Hog III.

    It looks like it jitters back and forth as it goes along, is there a way to increase the resolution of the move?

    i talked with flying pig and they think it is the catalyst, this would tally with the manual movement resolution of X position when programming so it looks like they might be right...

    Any ideas i might try?

    Thanks,

    Sam Hopkins
    Projection Engineer & Programmer
    Sunday In The Park With George
    Studio 54 new york

  2. #2
    Try using the "Movement Speed" channel....this is exactly the kind of issue it is designed for.

    On H3 it is called "Image Speed" under BEAM.

    ***EDIT- Not to be confused with "Play Speed" which is something else entirely***

    Hope this helps
    Best Regards,
    - Marty

  3. #3
    Quote Originally Posted by Samlight View Post
    i talked with flying pig and they think it is the catalyst

    who told you that ?

    It's not the Catalyst it's the DMX protocol it self not the catalyst .

    try record a preset in catalyst HUD for start of X position

    then trigger the the next Catalyst preset using DMX Preset Trigger .

  4. #4
    Funnily enough the 'Head of console development' told me that when I rang to ask if it was his dodgy fades... I can't see how its 'the DMX protocol itself' though, DMX is more than capable of the resolution I'm looking for.

    I'll try movement speed today, thanks.

    Sam

  5. #5
    Actually, I know a number of people who have run into this problem on the Hog 3, it's not the greatest of DMX processing. I know they have improved it recently, but I have seen quite a few people pulling their hair out over this same issue on a few shows. Not just with media servers either.

  6. #6
    I always get blamed for this - and its not me.
    its not dmx itself - its not catalyst - ( unless you are overloading catalyst )


    its the update rate of dmx from the console - or their inconsistent fade calculations.
    Its also the fact that dmx is not synchronised to video - and they never output dmx fast enough to keep up with 30fps or 25 fps video.

    Several years ago - the hog3 also used to be only 12bit on 16 bit channels.
    They may have played with these algorithms.

    I have added graph plotting to the software recently to PROVE it isnt me. see image below - you can plot a graph of incoming dmx.
    Because its also a problem with fading intensity.
    I got blamed for poor fading on several shows with hog2- but the hog2 only outputted dmx at 20fps...

    I also added movement smoothness overrides on each layer- so that if the movement from the console isnt good enough - and you cant reprogram a show - you can add movement smoothness anyway.

    You can also enable movement smoothness on the keystone and aspect ratio channels. On a show in london last year - they just couldnt get smooth enough dmx from a hog2 to make this seemless-

    --

    At the bottom of each layer in the HUD - there is a number with a pulldown menu-
    image shown below-

    You can enable movement smoothness overrides on intensity or movement channels, with different amounts of smoothness.

    ---


    Richard
    Attached Images Attached Images

  7. #7
    Thanks Richard for your response.

    I tried the things mentioned, looks like movement speed it will be.

    The movement smoothness overrides don't seem to work with a 0 count fade, or rather, it shouldn't work on an instant cue but it does! This gives me issues, so it has to be something I can engage from the console only when required.

    Movement speed appears to help.

    Thanks again, happy to report that other than this issue my 3 cats are working wonderfully as usual.

    Cheers,

    Sam

    Oh, PS, can anyone recommend a reasonable USB video or vga input device to use? The director has requested we try a trick involving input from a PC screen... don't want to blow the bank just checking out whether it works, but happy to spend a couple of hundred bucks to get a feed in and try it... any cheap and cheerful favourites?

  8. #8
    There are some Firewire devices out there that are essentially video capture interfaces.

    I have had good luck with both the DataVideo DAC-100 for composite/s-video inouts and the Canopus TwinPact-100boxes as well for this plus RGB + VGA inputs.

    Link to DataVideo:
    http://www.datavideo.us/products/dac_100_main_page.htm

    Link to Canopus:
    http://www.canopus.com/products/Twin...winPact100.php
    Best Regards,
    - Marty

  9. #9
    Quote Originally Posted by Marty Postma View Post
    thanks marty.

    this looks interesting to digitise vga- ill get one to check.

    havent seen this before.

  10. #10
    Quote Originally Posted by samsc View Post
    thanks marty.

    this looks interesting to digitise vga- ill get one to check.

    havent seen this before.
    No problem...Mainlight uses them all the time on the VLSE computers for SoftLED...very reliable.
    Best Regards,
    - Marty

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