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    LIVE Video input latency - Best hardware options?

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

      HI All, I am starting this thread to get all your feedback on best options for reducing video latency with live input feeds.
      There is info across many threads but it would be great to get your results and recommendations in one place.
      (There is already a separate thread for wireless video, so lets not include that here)

      I am especially curious about peoples recent results with BM products versus USB3 cameras, and other hardware solutions?

      Pro-User Latest Beta - MacBook Pro i7 2.66GHz SSD
      www.jamiegriffiths.com Arctic Canada
      www.chickweedarts.com

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      • primaldivine
        primaldivine last edited by

        Another related thread here: http://troikatronix.com/troikatronixforum/discussion/comment/12539/#Comment_12539
        about Blackmagic mini recorders.

        Pro-User Latest Beta - MacBook Pro i7 2.66GHz SSD
        www.jamiegriffiths.com Arctic Canada
        www.chickweedarts.com

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        • Skulpture
          Skulpture Izzy Guru last edited by

          I have the black magic thunderbolt intensity. Works fine for what I use it for but never done any testing to work out frame rates, etc.

          I know that Alexander (@Feinsinn) has the USB3 version which works on his mac too.

          Graham Thorne | www.grahamthorne.co.uk
          RIG 1: Windows 11, AMD 7 Ryzen, RTX3070, 16gig RAM. 2 x M.2 SSD. HD. Lenovo Legion 5 gaming laptop.
          RIG 2: Windows 11, Intel i19 12th Gen. RTX3070ti, 16gig RAM (ddr5), 1x M.2 SSD. UHD DELL G15 Gaming laptop.
          RIG 3: Apple rMBP i7, 8gig RAM 256 SSD, HD, OS X 10.12.12

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          • kdobbe
            kdobbe last edited by

            I have used the BM Thunderbolt intensity and a MacPro with a Dual AMD FirePro D500.  My use has been on live interactions with orchestras and there is still a visible delay when seeing a live conductor and a video projection (approximately 3-5 FPS).

            3 Macs: MacPro 6-core, New MacBook Pro (M1 Max); and iMac: OSX-12.01

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            • crystalhorizon
              crystalhorizon Beta Platinum last edited by

              As Graham mentioned the BM USB3 Intensity shuttle works great with my Macbook Pro. Latency is very good, but cant tell frames. Could be something like kdobbe mentioned...

              Alexander Nantschev | http://www.crystalhorizon.at | located in Vienna Austria

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              • B
                benthana last edited by

                As i said here i measured 5-6 Frames end-to-end.

                How and at what point of the signal chain do you guys measure?
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                • Fred
                  Fred last edited by

                  I measure input latency, I get 2 frames to the screen of my laptop with SDI cameras and bkackmagic thunderbolt. Output latency is anotger topic. Large projectors video walls and other proces sors an extenders will all induce more delay. These all change setup to setup. You can with some devices reduced delay by running a ref signal if the gear can take it and Eliminating the sync cycle.

                  http://www.fredrodrigues.net/
                  https://github.com/fred-dev
                  OSX 10.15.15 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
                  Windows 10 Threadripper 3960x 64g ram, 1tb NVME, rtx 2080ti + rtx2070 super

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                  • Marci
                    Marci last edited by

                    2 to 3 frames of input lag, and between 8 and 11 frames of output lag with nothing between MacBook and projector. This is with BM intensity shuttle USB3 and Canon HFG25 over HDMI at 1080i50, into the MBPro in my sig. Measured by separately videoing performance with live subject, Izzy and projection screen all in view and counting frame by frame in Adobe Premiere. Experiments with analog (Svhs) input at 720x486(29.9fps NTSC - Sony EVI D30) via the BM show this dropping to a more solid 2 frames at input and 9 frames at output.

                    rMBP 11,3 (mOS 10.13) / rMBP 11,4 (mOS 10.14) / 3x Kinect + Leap / TH2Go
                    Warning: autistic - may come across rather blunt and lacking in humour!

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                    • mark
                      mark last edited by

                      In terms of measuring latency, @Michel has an excellent technique:

                      1. Setup Isadora to have two stages.
                      2. Play video with burned in timecode to Stage 1.
                      3. Setup video capture with your camera. Point the capture camera at Stage 1 and start the live video input.
                      4. Use a Video In Watcher to render the captured video to Stage 2.
                      5. Point second camera (could be a phone or whatever) so it sees Stage 1 and Stage 2. Record.
                      6. Examine the resulting video recording. You will be able to precisely (and easily) see how many frames apart Stage 1 and Stage 2 are, thus telling you the exact latency.
                      Best Wishes,
                      Mark

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

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                      • Michel
                        Michel Izzy Guru last edited by

                        yep thats the way I do it :-).

                        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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                        • ioio
                          ioio last edited by

                          5. you can also make a screen capture of your screens

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                          • mark
                            mark last edited by

                            Dear @ioio,

                            That's true, but screen capturing like that might affect the frame rate and thus the latency. Seems better to capture it with an external camera.
                            Best Wishes,
                            Mark

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

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