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    Most efficient way to convert a image stream to a video stream?

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

      by image you mean picture-player  video out, using envelope gen plus videofader actor works for my project.

      best bts

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      • mark
        mark last edited by

        Dear DusX,

        Try the attached patch as an example -- it uses a table actor and quickly switches between the two inputs, which are in fact the same image. This causes a continuous stream of the image at the output, and should not add noticeable CPU.
        Best Wishes,
        Mark

        f5219e-push-still-image.izz

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

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        • C
          ckim Beta Platinum last edited by

          thanks.  this solve my PUSH problem too.  ck

          MacBookPro,

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          • DusX
            DusX Tech Staff last edited by

            Thanks Mark.. I will give this a go. I figured there must be a less CPU intense method.

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            • DusX
              DusX Tech Staff last edited by

              Interestingly, this looked like it should work, but if I run 2 of these 'streams' into a video mixer with the mix amount ramping upto 100 pausing X secs and then ramping down to 0 and waiting X seconds I still get the broken behavior.
              I get video output while the value is ramping, but once it is at either 0 or 100 % the video signal drops.
              By mixing a photo stream with a black video signal with values switching between 0 and 0.001 I can create a solid stream that doesn't get dropped when going into the same crossfade mix I described a second ago.
              Is there anything that distinguishes a video stream from an image stream, that might be changed when a photo stream is mixed with a video stream?
              Simply trying to create a video stream by sending multiple images streams doesn't seem to convince the Video Mixer actor?

              If you need more detail I can create a minimized example patch.

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              • DusX
                DusX Tech Staff last edited by

                Playing a little more I have found that I get a small performance increase by using the Video Fade actor rather than the Video Mixer.
                Since the fade is switching from 0 to 0.001 percent at the stages FPS, there is no visible effect, which is great, however; I suspect that a method that doesn't process the video data would be more effective.

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                • mark
                  mark last edited by

                  Dear DusX,

                  Well, I guess I need to understand why there is a problem in the first place. Even when the video signal "drops" as you say it, there is a valid image at the output. I made the Video Mixer patch you describe. With the mix at 0 or 100%, the output wire is red (not sending anything) because the image isn't changing. But you can see that there is a valid video there by hovering the mouse over the output wire -- you'll see the image come up. 
                  For the record, the answer to "Why does Isadora "drop" the connection?" is to be more efficient. There's no need for a "downstream" module to process the image if it hasn't actually changed.
                  Can you send me a simple example where this behavior is problematic for you? I need to see the situation clearly to help you solve the problem.
                  Best Wishes,
                  Mark

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

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                  • DusX
                    DusX Tech Staff last edited by

                    I figured that it was dropped to save CPU, as it makes sense an image doesn't change.
                    I will put a sample patch together.. ASAP.

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                    • DusX
                      DusX Tech Staff last edited by

                      OK, I have to start off by apologizing.. seems that the behavior I am seeing is due to a work around I had put in place for projectors, to auto hide if video stream was cut.
                      But now that I understand more about your pull system, am I correct in assuming that a projector will not use cpu, if no video is supplied? How does this work if a image stream is present?
                      I was using a tap tempo test on the video feed to control the on/off of the projector. This was working very well until now since all my media was video, I had only just added a picture player/slide show builder, this is how the issue developed.

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                      • mark
                        mark last edited by

                        Yes, a projector will use not use CPU to render an image if no image is present. There will be a tiny (and I mean tiny) CPU usage if you are changing the various input parameters -- but if no video stream is present, nothing is sent to the graphics card, 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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                        • DusX
                          DusX Tech Staff last edited by

                          OK, think I have the best of both worlds now.. I am using your table solution at 1/4 the stage frame-rate to send a message, so that if any patching (uses broadcast and listen) changes, the new modules get the update.
                          I need to do more testing but this seems to be a good solution for my setup.

                          thanks for the help Mark.

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