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Video monitor & After Effects (BM Decklink)

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Thomas Duquet
Video monitor & After Effects (BM Decklink)
on Aug 29, 2018 at 7:03:42 am

Hey everyone

First time posting here after reading a lot.
I've asked this on other forums (blackmagic and Adobe) but can't seem to have any response yet.

I am trying to have a good monitoring of my work in After Effects (AE) using a Decklink monitor on mac (hackintosh, pci e).
There is a lot of things that I don't understand so sorry for the noob questions, but I can't find any information about that :

- Mercury Transmit activated on AE with Decklink monitor
- My config is a DELL U2412M > HDMI > Decklink monitor 4K, for now
- My composition is 25 fps : Error message, monitor don't support this (monitor is running native at 1920x1200 60Hz). Does it means that the Decklink is sending 25 Hz to the monitor and it doesn't support it ? Would a "real" video monitor support it ?
- On Resolve, on a 25 fps timeline, it works fine. Why ? Is it Resolve who convert 25 to 60 ? Do I see 25 or 60 Hz ?
- On AE : 50 or 60 fps composition, it display an image. BUT : the playback on the monitor is not sync with AE. On the monitor, it is slower, and it stops seconds after I press "stop" (space bar) and the composition has stop playing.
- On AE : my monitor is 1920x1200, my comp is 1920x1080, but the decklink display it vertically stretched on the external monitor, so it takes all the display area. Can't seems to find how to correct it.

It seems like I am doing everything wrong. I really need help from more experienced people.

- Can I, with a decklink monitor, and a pc monitor, have a real 25/30/50/60 fps monitoring on AE ?
- What hardware do I need to see real progressive AND interlaced output ?
- I do motion design, now for the television, and I need to see my animation @25 fps 1080i in order to see if the animation is displaying fine.

I would really appreciate your help !


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Tero Ahlfors
Re: Video monitor & After Effects (BM Decklink)
on Aug 29, 2018 at 9:04:39 am

I/O devices only output to standard resolutions and frame rates supported by the device. I think there was an option in the playback settings to up or downscale the signal if the display resolution doesn't match. If you need to monitor in 50/60fps you'll need to check that your I/O device supports that frame rate in the resolution you're working in. So if you want to monitor 1920x1080 at 50fps but the device only supports 1280x720 at 50fps there will be no output.

I also doubt that your monitor can show interlaced footage correctly. I'd suggest getting a proper reference monitor. Like the Flanders Scientific AM-210.


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Thomas Duquet
Re: Video monitor & After Effects (BM Decklink)
on Aug 29, 2018 at 9:52:16 am

Thanks for your help,

[Tero Ahlfors] "So if you want to monitor 1920x1080 at 50fps but the device only supports 1280x720 at 50fps there will be no output."

Well Blackmagic Monitor 4K support a lot of frame rate :

HD Video Standards

720p50, 720p59.94, 720p60
1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50, 1080p59.94, 1080p60
1080PsF23.98, 1080PsF24, 1080PsF25, 1080PsF29.97, 1080PsF30
1080i50, 1080i59.94, 1080i60


So I don't understand why my monitor does not support the output at 1080p25.
Is it my monitor who does not support 25Hz ? I don't have enough knowledge about that.
And why on the same monitor, the BM card plays from resolve a timeline at 1080p25.

[Tero Ahlfors] "I also doubt that your monitor can show interlaced footage correctly. I'd suggest getting a proper reference monitor. Like the Flanders Scientific AM-210."

Thanks about that I don't know a lot of reference monitor yet.
A shame there is no "cheap" way to display interlaced footage.


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