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    Video Delay Limitations

    How To... ?
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    • willystyle
      willystyle last edited by

      Hi All

      I have been working with some students playing with time delayed performance. Ideally we'd like to be able to buffer anything up to 10 minutes of video input with the video delay actor, then it be sent to the projector for playback. I have noticed that the video delay will not let me go above 1000 frames (Roughly 30 seconds). Is this a limitation of the software or actor, is there any way to extend this?
      Thanks in advance,
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      • Fred
        Fred last edited by

        This is a hard thing to do, 1000 frames is pretty big. You have to store all the frames somewhere in memory and then red them back as you are collecting more. video delay (even for the pro market) is very hard to do and expensive. To store 10 minutes of video you are going to have to record it in chunks and then play the chunks back. If your frames are low resolution enough you can try using a few of these buffers- you will run out of ram fast though.

        http://www.fredrodrigues.net/
        https://github.com/fred-dev
        OSX 13.6.4 (22G513) MBP 2019 16" 2.3 GHz 8-Core i9, Radeon Pro 5500M 8 GB, 32g RAM
        Windows 10 7700K, GTX 1080ti, 32g RAM, 2tb raided SSD

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        • vanakaru
          vanakaru last edited by

          you can daisy-chain the delays, but look what happens.

          MBP 4.1 & MBP (Retina, Mid 2012) MBP Retina 2017

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          • Bodo
            Bodo last edited by

            ...but what i know isadora can only use 2gb of ram for the video delay - look at this tread:

            http://troikatronix.com/troikatronixforum/discussion/1021/livecamera-with-1.5minutes-delay-over-one-hour#Item_6

            MacPro Late 2013 OSX 10.13., Izzy 2.6.1

            http://studio6.berlin

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            • willystyle
              willystyle last edited by

              Thank you, very helpful replies. I figured RAM would be a problem at some point. Bodo, thank you for that link, I'll give that a go.

              The other idea we had is to use a Sony HDD Recorder with a camcorder on "timeslip", I know that this will give us the required delay as I've used it on it's own in performance before. I have an ADVC that I can use to send it into Isadora however I imagine latency will be an issue. The students have just this second upped the anti by requesting that we be able to see both live and delayed images super imposed on each other. This project is getting more complicated by the second!
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              • mark
                mark last edited by

                Reducing the resolution is really the only way to get 1000 frames. To calculate the required resolution:

                H x W x 4 x FRAMES
                (the x 4 is because there are 4 bytes per frame.)
                So, 
                320 x 240 x 4 x 1000 ~= 300 MB
                400 x 300 x 4 x 1000 ~= 450 MB
                640 x 480 x 4 x 1000 ~= 1.2 GB
                etc.
                Best Wishes,
                Mark

                Media Artist & Creator of Isadora
                Macintosh SE-30, 32 Mb RAM, MacOS 7.6, Dual Floppy Drives

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                • willystyle
                  willystyle last edited by

                  Thanks Mark

                  I'll give that a go. Sorry for delay in responding. I've been in production for the last fortnight.
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