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    Short delay playing movie when triggering speed via midi

    Interfacing
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    • Mr_J
      Mr_J last edited by

      Hi, when i adjust Movie Player speed using midi in (via an Evolution X-Session midi controller) i notice the movie playing pauses briefly before playing at the new speed set. The audio of the movie also cuts out whilst the movie appears to be adjusting to the new play speed set. I'm keen to find the cause of this playback delay in the hope i can somehow tweak it out. Ideally i'd like a smooth playback, with no brief pause when adjusting the play speed.

      Perhaps the delay is due to the time taken to read the new midi in value? Or maybe because the full midi in range is only 0 to 127?

      Any assistance appreciated. Cheers, Mr J

      Am running Isadora 2.2.2 on OSX 10.10.3 and have tried a variety of movie codecs including pjpeg, mov and mp4

      Was wondering if others have noticed a short delay when triggering midi in?

      Izzy 4.0.2 | MBP (16-inch, 2023) M2 Max 96GB | macOS 13.2.1
      Izzy 3.2.6 | MBP (16-inch, 2019) 2.3 GHz 8-Core i9 64GB AMD Radeon Pro 5600M 8 GB | macOS 10.15.7

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      • jhoepffner
        jhoepffner last edited by

        Hello,

        Without a view of your patch, it is difficult to help…
        I try to reproduce your goal and it works perfectly, what's important:
        – choose in speed entry the proper max and min (-1 to 1 in my patch)
        – choose interactive in optimize entry
        – use limit-scale actor to optimize the few 127 steps of midi
        – use a good and efficient codec, h264 from Compressor in my case
        Here is a view of the patch

        bb1fe2-movieplayer-with-varispeed.jpg

        Jacques Hoepffner http://hoepffner.info
        GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
        MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
        MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
        MSI GS65 i7 3.6 Ghz 32 Go / GTX 1070 8 Go / Windows 10 / Izzy 3.0.3b2

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        • Mr_J
          Mr_J last edited by

          Thanks Jacques, your advise has helped me a lot. Has been about a year since i last wrote a patch and i forgot to use limit-scale actor and didn't have "interactive" mode set either.... duh!!!

          Now works as desired but i'll have to stay away from using mp4's. I'm surprised you recommend using h264. It's a very efficient codec but has to read across many frames when decoding, so not a very smooth playback when adjusting speed value.

          Rgds, Mr J

          Izzy 4.0.2 | MBP (16-inch, 2023) M2 Max 96GB | macOS 13.2.1
          Izzy 3.2.6 | MBP (16-inch, 2019) 2.3 GHz 8-Core i9 64GB AMD Radeon Pro 5600M 8 GB | macOS 10.15.7

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          • jhoepffner
            jhoepffner last edited by

            All h264 are not equals… I use the h264 directly proposed when you choose "master" from FCPX and it's not a .mp4 but a .mov, I think it must be an I frame codec (without key-frames) and on my computers it play perfectly well with Isadora and it's very quick to output from fcpx.

            Jacques

            Jacques Hoepffner http://hoepffner.info
            GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
            MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
            MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
            MSI GS65 i7 3.6 Ghz 32 Go / GTX 1070 8 Go / Windows 10 / Izzy 3.0.3b2

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            • Michel
              Michel Izzy Guru last edited by

              @jhoepffner

              h264 is originally not an iframe codec, it seems contrary to how h264 works. But as you say you can export .h264 with iframes and will benefit of the good codec and the interactivity of iframes. Though you will have larger files. To be honest I never used it myself but will try in future to see the difference in quality, performance and size compared to ProRes 422 or PhotoJPEG.

              Best Michel

              Michel Weber | www.filmprojekt.ch | rMBP (2019) i9, 16gig, AMD 5500M 8 GB, OS X 10.15 | located in Winterthur Switzerland.

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              • jhoepffner
                jhoepffner last edited by

                @michel

                Yes it seems contradictory, but as you can see in the Lumix GH4, you can choose a i-frame h264 codec to have a more fluid editing.
                At the moment it's my favorite codec, I use ProRes only for exchange between apps.
                Jacques

                Jacques Hoepffner http://hoepffner.info
                GigaByte 550b / Ryzen 7 3800X / Ram 64 Go / RTX 3090 24 Go / SSD 2 To / raid0 32 To
                MBP 13' i5 2.6 Ghz 16 Go / Intel Iris / macOs 10.11.6 / izzy 2.6.1 + 3.0.3b2
                MBP 15' i7 2.6 Ghz 16 Go / GTX 650M 1Go/ MacOs10.13.3 / Izzy 2.6.1
                MSI GS65 i7 3.6 Ghz 32 Go / GTX 1070 8 Go / Windows 10 / Izzy 3.0.3b2

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