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    Synchronizing Video-Start

    How To... ?
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    • M
      mo last edited by mo

      Hello,

      I have a question/problem :

      I want to start three seperate Movie-Files simultaniously, with them starting to play at the excact same time.

      When i trigger the videos, each one has an individual delay ( 0,1-1,0s) until it starts playing. When one "loads" very fast, but the other one takes a second to start, 

      you can imagine that there is a offset between the two. This seems to be random. Sometimes the offset is not notiable, sometimes its almost a second.

      I tried using the classic movie preload actor to preload the big video files, but that just keeps crashing isadora.

      Using the position pointer of one movie for the playback position of the other movie, it results in stuttering playback.

      Has anyone any idea?

      Thank you very much in advance!

      PS: Im working on a powerful MacPro with 64gb RAM and Intel Xeon Processor.

      Michel DusX 2 Replies Last reply Reply Quote 0
      • Michel
        Michel Izzy Guru @mo last edited by Michel

        @mo

        What OS X version are you using?
        What version of Isadora are you using?
        What is the codec and resolution of your movies?
        Are the movies played from an SSD drive?

        Best Michel

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

        1 Reply Last reply Reply Quote 0
        • Fred
          Fred last edited by

          Is there a reason you cannot make one movie out off all of them with larger dimensions and spread it across your projectors? This is the best way to guarantee sync. Otherwise in my experience OSX lags a bit at this, the same structure on windows with DS playback gives near jam sync by starting movies from a single signal.

          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

          1 Reply Last reply Reply Quote 1
          • GertjanB
            GertjanB Beta Platinum last edited by

            To sync multiple video's I almost always use the position:

            All the sound on one video. (sometimes just a black video) = master

            Than i connect the position output of the "master" to all other video's (on interactive & with speed 0 otherwise you get stuttering). 

            www.gertjanbiasino.be

            1 Reply Last reply Reply Quote 1
            • DusX
              DusX Tech Staff @mo last edited by

              @mo
              When you say 'trigger' the movies, what exactly are you doing to start playback?
              If turning 'on' the movie player, the startup of the player may have delay.
              If changing the movie ID #, there will be load delay.
              However, you may find less/no delay if you have the movie ID set, the Player set to ON, and the speed set to 0, then input a 1 for the speed to all players.
              Depending on drive speed (SSD is a must), and codec (I prefer HAP), you could get a rather in sync startup.
              Using HAP as the codec, should also allow the option of using a Master to control others via the Position output a viable option.
              For Perfect Sync, @Fred has outlined the most reliable method.

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              1 Reply Last reply Reply Quote 0
              • Maximortal
                Maximortal last edited by

                On my experience to have a sync frame by frame the only solution is to have a multiple video an then crop it. Other solutions can introduce some jitter on frame decoding. 

                Iro Suraci | Win 10 - Ryzen 3600 - 32GB - nVidia gtx 960 4gb / Win 10 - i5 4210U - 8 GB - R5 M230 | Isadora 3.0.7| Located in Brescia, Italy

                1 Reply Last reply Reply Quote 0
                • M
                  mo last edited by

                  Dear All,

                  Thank you so much for all your responses! 

                  I don't have the time right now, to answer all of your great feedback.

                  I tried using the position method , where the position of one "master" movie player controls the position of the rest, but that resulted in jittery playback.

                  I will try out the speed 0/1 method next, thank you for that idea!

                  best regards

                  mo

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