Record an audiovisual set (the output) from VDMX

audio
video-capture
#1

Hi everyone, hope you’re all staying safe and creative :hugs:

Until now I’ve used Syphon Recorder to capture the output from VDMX, but I want to move to an external recorder on a HDMI output. 1080p at 60fps. There needs to be practically zero latency as the audio has to be perfectly synced.

I’ve read this video capture devices thread and this blog post by Projectile Objects, thank you. But it’s still unclear to me what I need to purchase exactly.

I’ve been suggested the Blackmagic Video Assist: Is this as simple as running a cable from the Thunderbolt 2 port on my Macbook Pro into the HDMI port of the BM Video Assist and pressing record?

In the Projectile Objects post, it says all the devices from Cloner-Alliance work and spoof HDCP but there are many devices, and I’m assuming I’d be looking at the “Standalone Recording” devices rather than the “Capture and Stream” devices off their website?

From the reading I’ve done I’m guessing that I’d want one type of device to record my visual set from VDMX and another type of device to receive a camera feed into VDMX and output that to a screen (with minimum latency) - or is there something that can handle both?

Got some good tips on this Facebook post relating to a (now cancelled) gig where I’d have been receiving a video feed of a performer, Adrian Wyard suggested a thunderbolt Blackmagic Capture Device - is a “capture device” all about recording a video signal COMING IN to your computer from eg. a DSLR rather than recording the OUTPUT from VDMX as a movie file?

Right now the priority is recording high quality audiovisual mixes at as high a frame rate as possible with minimal lag. Willing to invest in something decent, hope this all makes sense.

Thank in advance!

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#2

Maybe look for some used Atomos Ninja or the like. Then you would also get a nice monitor to see what you are capturing. It has HDMI in and OUT. I think HDCP is nothing you need to take care of.

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#3

Do you actually need to record at 60fps? If you are recording your set to share or screen later 25/30fps would be fine. If you are recording clips to use in your set 60fps could be useful and you may also have to consider 3 or 4 channel capture (if you need alpha).

When I was last looking at this I think AJA was the only standalone device manufacturer who supported 4:4:4 RGB 8, 10-bit (deep color). Blackmagic Design Video Assist, Atmos and Datavideo standalone devices only supported 3 channel RGB recording. But this was always a mute point as I could never afford one of these devices so I can’t give you any feedback on performance or usability. For 4 channel clips I would look more at content origination than capture workflows… or you go with 3 channel green/blue screen and chroma key on the fly.

The Blackmagic Design and other vendor PCIe cards are low cost so one solution might be to build a dedicated machine for capture (Mac, OSX86, Linux, Windows). But there are challenges with this. The biggest issue I’ve had with building a dedicated machine is IO. I recently upgraded to M2 SSD on my capture machine and still I don’t have enough bandwidth for anything above 2k. It’s always a juggling match to try to get the right balance right between cost and performance. But high quality HD 1080 is easy to achieve at a budget.

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#4

Thanks guys. I ended up buying the Blackmagic Video Assist 7" 12G.

Went for the 7" due to the mini-XLR inputs so I have the option to get the sound in from the audio artist if I ever want to record a show or performance live. Getting a custom cable made, 2 x male mini-XLR’s to a mini-jack (really hard to find mini-XLR cables for this exact purpose).

For home recording I’ll just use the HDMI for the video & audio.

I bought the newer version with the USB-C port so have option to record onto SSD as well + ability to record 4k @60fps - for an extra £80 I thought it made sense to future proof (since it’s quite pricey already) though my laptop won’t handle that of course but I may upgrade to an iMac or PC for TouchDesigner in future. 🤷Was tricky to know what was the best decision but I think it’s a good investment.

I think (hope!) this will cover a number of use cases like getting video feed with minimal latency from a DLSR and for streaming but I learn best by doing so will figure it out. Will probably add a Roland V-1HD in future as I want to expand my skillset to working with live video feeds.

Re the 60fps question, I notice a big difference when recording at 30fps vs 60fps, doesn’t feel as snappy. Vimeo accepts 60fps and I’d want to record at the same frame rate I’m outputting from VDMX.

Thanks for the tips around 4 channel RGB, not an issue for me. Not keen on a dedicated machine at the moment as I don’t feel inclined to build out what I need (ps. what is IO? - is that Input / Output?)

Small disclaimer, I feel very out of my depth here… so just sharing my experience in case it helps others!

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