525 scanlines….

v002 525 is a plugin that emulates a what a full frame scanned SD video signal looks like. 525 is the designation/line count of NTSC SD video, but you normally only have 486 active/visible lines. The other 36 scanlines + flyback* carry other ‘metadata’ and analog requirements for the signal. VITC time code, closed captioning, horizontal and vertical sync, are all portions of the signal one normally does not see. 525 is a simple plugin meant to help generate authentic looking glitch. The analog glitch effect itself needs a lot of work as it stands, but the effect is much more convincing with the ‘complete’ signal.

QT7 required.

*flyback is one term for the signal which allows the CRT gun to ‘fly back’ to the next scanline, without drawing anything on the screen. See here for more info…

8 Responses to “525 scanlines….”

  1. mary ann Says:

    KLEEEEEEEEEEET!

  2. vade Says:

    [kleet] video is better in dimension x… it is not subject to this ‘interference’… [/kleet]

  3. kyle Says:

    So good — I like the line just below the grayscale bar.

    I feel like part of what makes analog glitches so provocative is noise in the control signal, so it’s a little strange to see the really linear x-offset modulation in the demo video.

    I’m really curious to see where this goes when you introduce feedback between the resulting video and the parameters controlling the glitch.

  4. vade Says:

    you are 100% right kyle. noisy control signals is where its at. I hacked together a really quick (and admittedly poor) glitch shader. There is lots of room to improve. One of the other things rarely seen with glitch-alike plugins is the color burst signal being messed with. Im thinking of introducing some sort of variable to offset the color channels as well.

    There is LOTs to explore. This is def something that can get a lot of tuning and get out of hand fast :)

  5. felix Says:

    looks awesome – just needs some VCR snow for extra realism. Are you sharing the qtz?

  6. vade Says:

    Yes – once its ready, the plugin will be available :)

  7. kyle Says:

    Yeah, messing with the color burst definitely. Also, I’m guessing you know LoVid? Their Sync Armonica http://www.lovid.org/synths/syncarmonica.htm is interesting in that the sync timing is a variable. Re-synced video will stretch/shrink horizontal lines and the pixels themself will start to generate the color bursts, etc. I don’t know how you’ve implemented this effect, so I don’t know if re-syncing is possible…

  8. vade Says:

    Well, right now the 525 scanline plugin does not handle the glitch at all, just the ’embedding’ of the surrounding video. Im familiar with LoVid yeah, they are super cool, and really nice, I was fortunate enough to meet them in person and see them perform. Really cool stuff. Id like to see a video of that box/effect, so I can know how I might go about reproducing it.

    The thing with analog glitch ‘software’ is you really have to work around the assumptions of OpenGL, and end up with some weird hacks. Ideally you could just emulate a CRT and sync signal, but its really not feasable/possible since the frequencies are so high. Id love to see some examples, and I could probably work out a good way of doing something similar :)

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